Circuit Electronics

AC wattmeter circuits are simple

noreply@blogger.com (tom) — Tue, 20 Nov 2012 06:56:00 +0000

If you are looking for AC power measurement. To use it just a little, which is not worth it. When we need to buy an expensive tool. Because use little does not need high accuracy. I would like to propose the concept of wattmeter circuit in such a way easy as it was.I collected all three circuit, as follows. Read more : Simple AC wattmeter circuit

Mini-USB PIC Programmer Kit

noreply@blogger.com (tom) — Fri, 26 Oct 2012 05:08:00 +0000

A professional yet compact USB PIC Programmer offering a 20-pin ZIF (Zero Insertion Force) socket for easy programming of most Microchip PIC Flash devices that do not require Low-Voltage Programming. This PIC Programmer uses a convenient USB port for connection to the computer as opposed to the traditional Serial port. This eliminates the need for a separate power supply, as power is taken directly from your computer's USB port. The PIC Programmer also offers In-circuit programming through a standard 6-pin ICSP connector as well as a the built-in 20-pin ZIF socket. This means easy programming of most PICs of up to 20-pins right on the programmer! This Programmer is also 100% compatible with PICkit 2 interface, and [...] Read more

Xbee Wireless Kit (Chip Antenna)

noreply@blogger.com (tom) — Fri, 26 Oct 2012 04:57:00 +0000

This is a complete XBee wireless communication kit with everything you need to get up and running quickly, including 2 1mW XBee modules with chip antenna, the popular USB XBee Explorer, an XBee shield as well as headers required for the XBee shield. The very popular 2.4GHz XBee modules from Digi (formally Maxstream) take the 802.15.4 stack (the basis for Zigbee) and wrap it into a very simple to use serial command set. These modules allow a very reliable and simple communication between microcontrollers, computers, systems, really anything with a serial port! Point to point and multi-point networks are supported.
The goal for this complete XBee Kit is to make wireless communication simple. Connect one XBee to the shield and your Arduino, connect the other XBee to the Explorer board and your computer, and you'll be able to seamlessly pass serial data to and from your Arduino wirelessly! Using this connection, you can transmit remote sensor data, or send data from your computer to update a scoreboard, or drive a robot from your keyboard! [...] Read more

6V backup battery power supply regulator with IC 7805

noreply@blogger.com (tom) — Fri, 26 Oct 2012 04:46:00 +0000

This simple and cheap 6 volt power supply circuit with 6V backup battery system.
The AC power 220V is entered to through input of transformer-T1 to reduce voltage as 9VAC, then wire connected to four diode D1-D4 as bridge rectifier became to 11VDC, then the current is filtered to dc voltage that low ripple output and then the voltage is regulated to 6VDC constant voltage by IC-KA7805( IC-7805 type) In normal it is used for 5 volt only but now we add two resistor to determined output voltage is 6 volt and passed through diode 1N4002-D6 to output is 6 volt.

Read more source: http://www.eleccircuit.com/6v-backup-battery-power-supply-regulator-with-ic-7805/

DC adjustable power supply high efficiency 0-50V 1A by CA3130-CA3086

noreply@blogger.com (tom) — Tue, 16 Oct 2012 00:17:00 +0000

Today I would recommend a DC power supply that can adjust voltage and current, another one circuit. It’s very interesting since is highly effective, devices not very. This circuit has special feature that can supply output voltage widely range is during 0.1V to 50V
With value of the load regulation changes not more than 0.005% between 0A to 1A.
-The stability of regulation, when change the input voltage, the criterion is 0.01%.
-The noise output signal under 250uV
-This circuit can provide an output voltage in a wide range by the number of IC-CA3130 by the input range is 0V.
-During the extension of the output voltage can not, by adding Q4 between this IC and transistor both series. This circuit has a high threshold makes the regulation is accurately high level. Darlington transistors T1/T2 and make a high enough flow. Q3 is the limited current output. When the VR1 fully anticlockwise, Q3 current limit around 0.6A. This current limit, it will not work When the VR2 rotate clockwise until it stops.

Read more source : http://www.eleccircuit.com/circuit-power-supply-regulator-01-50v-1a-by-ic-ca3130-ca3086-2n3055/

Small DC to DC converter 1.5V or 3V to 9V by TL496

noreply@blogger.com (tom) — Tue, 16 Oct 2012 00:06:00 +0000

When you have sized batteries is 1.5V or 3V, but need a voltage 9VDC, DC converter circuit to help you for sure!
Some problems in the electronics job, can modify or bring devices come to apply available not difficult If we know the principles and limitations of those devices. As the project is being offered at this time, will be bringing sized batteries 1.5 volt connected through an electronic circuit called dc converter to increase the voltage to have higher value be 9 volt instead of the battery 6 pack, connected series.
It can also increase the voltage from the battery 3 volt to 9 volt as well be the original circuit, and it will allow more current.
Properties of the IC TL496
- A TL496 be control circuit of the power supply, by the circuit was designed, so that the output voltage is 9 volt. For the change of the input voltage, which comes from the battery 1 or 2 pack. The TL496 operates in a switching regulator, the power loss is less than the typical linear regulator.

Read more source: http://www.eleccircuit.com/micro-dc-converter-3v-to-9v-using-tl496/

The 60hz calibration frequency standards for digital clock by MM5369

noreply@blogger.com (tom) — Fri, 12 Oct 2012 19:19:00 +0000

This is digital circuit, Pulse Generator 60HZ and TP 3.579MHZ. It use IC MM5369 – 8Pin easy use. power supply 12V.Out put Frequency 60HZ Pulse Generator. (PIN 1)
This is calibration frequency standards for digital clock circuit.
When you have finished building your digital clock circuit kits, with any ICs number. But how to
which normally we will be get the standard frequency signal of AC power line 60Hz (North America the power line frequency is 60 cycles per second or 60 Hertz) that is a sine wave and then is converted with the Pulse Generator circuit become to square wave form of 60 Hz .
But when we need to use it in the car or others DC power supply. How to it still work well?
We so built the circuit of the pulse generator of 60Hz, to replace the old ways. You may also be adapted to backup set , when the power goes out. We do not have to waste time re-scheduling.[...]

Read more source: http://www.eleccircuit.com/60hz-clock-pulse-generator/

DC voltage adjustable power supply 0-50V up to 2A by ua723-2N3055

noreply@blogger.com (tom) — Fri, 12 Oct 2012 18:56:00 +0000

The Circuit power supply regulator 0-50V 2A by IC LM723 + Transistor 2N3055 & BD140 & A671 is nice Pwer supply,
For all electronic user. You can Current control by VR 5K, LED5 For display OVERLOAD.
To use transformer 3A, Transistor to Hold Heatsink. To adjust the output voltage< VR1 - 5K (VOLT CONTROL)
OUTPUT : 0V to 50V , 2A
Today I would like to introduce you to DC Voltage adjustable regulator voltage between 0V to 50V and current up to 2A. Which are suitable for various electronic circuit, when viewing circuits in the figure, many people will think that, in this circuits outdated, but I think, it is also highly effective are.
The VR2-5K be adjusted voltage output between 0 to 50Volt.
-The VR1- 5K be fined current output load 0 to 2 Amp.
- When the short-circuit current limit or severe, it is a good system.
- Low noise, due to the use IC uA723 dc voltage regulator IC which is high quality, widely used for many years.

Read more at source: http://www.eleccircuit.com/power-supply-regulator-0-50v-2a-by-ic-lm723-transistor-2n3055-bd140-a671/

Bass guitar super bridge amplifier 200 watt.

noreply@blogger.com (tom) — Mon, 17 Sep 2012 19:15:00 +0000

If You want to circuits amplifiers for bass guitar, or for using in every situation such as both listen to in the house, outside the house or outdoors. This circuit is answer that you is looking for. It is wisely designed with power output at 200 watt in super bridge model so help to you have a high quality circuit in cheap.
The characteristics of the circuit as shown in figure 1. When we carefully consider found that amplifier circuit consists of two sets are:
- The first circuit set consists of many transistors Q1(MPSA06), Q2(MPSA06), Q3(MPSA56), Q4(BC182), Q5(BC182) ,Q6(BC212), Q11(MJ3001) and Q12(MJ2501)
- The series 2 circuits consisting of Q7(MPSA06), Q8(MPSA06), Q9(MPSA06), Q10(BC182), Q13(MJ3001), Q14(MJ2501).
Both of these circuits has pattern is very similar, but slightly different, is the series 2 circuits cut off the protection circuit of section output transistor to go out. And we enter the input signal to input of first circuit only.
-But the differential input of the series 2 circuit is connected to ground. While the output of first circuit is entered to R28 to inverting input of Q8 makes output of second circuit is 180o out-of-phase automatically.
- With this setting wisely so do not need to connect bridge adapter circuit that difficult and too expensive.
How it works
-The signal is entered the input jack and SEND jack and RETURN to C1 to the differential amplifier Q1.
- the signal is amplified out to collector and pass through R3 to base of transistor driver circuit of Q3.
- The output at collector pin Q3 will pass two R7,R16 to drive the power transistors Q11,Q12.
- The Q5 is setting bias current of transistors output in reasonable range.
- Two Q4,Q5 are protection working of the power transistors not has too high circuit. Which may occur of the short circuit by output. We have both resistor R12,R13 are output signal detector. If the current exceeds the value set will be a high enough voltage across to make Q4, Q6 work.
- The voltage that enter to base of Q11,Q12 will be short circuit by Q4,Q6 as above, Until the output current is reduced and lower in a satisfactory security.

Read more and see circuit&PCB

Wide stereo system circuit by TL082

noreply@blogger.com (tom) — Mon, 10 Sep 2012 10:17:00 +0000

Added dimension to get sound of music wider stereo system. Suitable for, you are tired of the original sound. I’m not making you uncomfortable with electronic projects difficult, and expensive.
This circuit enhances the Joy of musical level. The principle is easy to understand, and with a simple, inexpensive equipment. The love of the instrument, do not miss this project. Before building, I understand the principle well.
The working principle.
-We will feel that Sound has the width more depth with the stereo mix. (Signal was split left and right.) Both together. For example, usually the guitar sound is right side and there is electone sound is left side. However, this circuit makes the guitar sound mixed into the right side slightly. Then take the audio electone, came into existence with left side. We therefore feel that the sound wide up as soon.
-In the circuit, on the left and right stereo signals into the circuit, will through C1- C2 to pin 3 – pin 5 of IC1(TL082), out to the 1 pin – 7 pin, And some signal is fed back to pin 2, pin 6 by VR1, R5 and R6 each side.
-In the middle leg of the VR1 / 1(50K) and VR1 / 2(50K) near 1 leg, So left signal is fed back into the 2 leg. The output signal also the left side intact.
-But when leg move closer to the middle of 3 leg is the right side signal, From the 7 pin of IC1 / 2(TL082) through VR1 / 2, R7, VR1 / 1 and R5 to pin 2, Makes output at pin 1 is the signal right side mix. Likewise Pin 1 is the signal left side of the right side leg six mixed the signal to IC1 / 2 as well.
The first may have confused some readers But read it again to understand more. If you understand already.
Read more and view circuit

Power supply regulator 1_2V-20V and 3V-6V-9V-12V 3Amp With LM317T and 2N3055

noreply@blogger.com (tom) — Sat, 08 Sep 2012 20:08:00 +0000

This is the high quality power supply to provide high current 3A. And still adjust voltage in steps from 3V, 6V, 9V, 12V. adjust voltage is continuous 1.25V to 20V. Using LM317T and 2N3055 are main parts so easy to made and cheap.
Friends would known the power supply as well. Because you must use in various circuit experiment. It originally had a small supply current, when found projects that uses lot of current. Such as an audio amplifier circuit so provide current is not enough.
This project can help you. Because of provide high current 3A. And still adjust voltage in steps from 3V, 6V, 9V, 12V. adjust voltage is continuous. And you do not have to worry. This creates a simple and economical. If interested, please read on.
How it works
In the circuit below can be seen that, when opening switch S1 is current through the transformer. To convert from 220V AC to 18V, then through diode bridge rectifier BD1. But is a DC supply that still not smooth. Then, a filter capacitor C1 serves electricity, out of BD1 to be more smooth with the LED1 to show that power is supplied to already.
When the filter current is smooth on one order. The current will through the regulator circuit that the main components are IC1(LM317T) and Q1(2N3055).
-IC1 is the regulator IC number : LM317T.
-Q1 is power transistor NPN type number : 2N3055.
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Nicad Battery Charger by IC LM317T

noreply@blogger.com (tom) — Sat, 08 Sep 2012 04:56:00 +0000

This is a NiCAD battery charger circuit. High-quality, Not necessary to have a full charge and cut, Because this circuit charges with constant current and voltage regulated. But this circuit is not difficult and cheap.
The basic principles of a NiCAD Battery charging. There are a number of ways, as follows.
1. A constant current.
The Nicad battery can provide current 500mA-hr charge rate that is 1/10 of the current capacity. Therefore should be charged with a constant current 50mA for 10 hours, but actually want to charge for 14-16 hours because when near full current to charge less. So lasts longer.
- In the NiCAD battery charger for fast charging current to about 100mA charging rate for 3-5 hours. But it has the disadvantage of charging, when the battery is fully charged, it must be removed, otherwise the chemical substances in the battery will be very hot and damage.
- But a slow charger will not do, because it can withstand heat.
2.A constant voltage or Fixed voltage regulator
The NiCAD battery, each battery has a voltage 1.2V, when it is fully charged voltage 1.25-1.3V. Therefore, we are charging a battery, the plus the voltage additive, such as 4 pieces, then the charging voltage 1.2×4 = 4.8V. But the charge like this, at first, a very high current flow. So, the voltage between NiCAD battery charger and very different, may have caused overheating and damage.
3. The Current and Constant voltage.
Like this charging, devices little more than the two first, but high quality. The safest way, and the battery the voltage is required by the specifications. When fully charged, the charger can be left in, because there is no current flow, Because the the voltage between the battery as well.
- I so chose the charging current and Constant voltage.
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The Mixer Pre MIC 3 channel by LM348-741×4

noreply@blogger.com (tom) — Fri, 07 Sep 2012 10:47:00 +0000

If you are looking for a mixer with a microphone, and can easily make your own.I highly recommend this circuit.It is a microphone pre-amplifier for 3-channel or 3-channel mixer itself. When looking at the circuit, we have featured the use of a single integrated circuit LM348. The internal structure of the four IC-741 ICs. When It costs was similar, thus allowing us to save all of IC-741 and convenient to use than one x 4pcs.
And we can adjust the volume, each microphone freely by VR1,VR2,VR3. But this circuit used to the dual power supply +12V -12V and GND that should be dc voltage regulator with IC-7812,7912 or transistor follow you want.....
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Power Regulator +12V_-12V by 7812 , 7912

noreply@blogger.com (tom) — Fri, 07 Sep 2012 10:45:00 +0000

I plan to show you, with an interesting concept.When I was make pre-amplifier circuit is small. I did not plan on the power supply. It requires low supply current is only 100mA. But the need for dual voltage. Or 3 line is +12 V,-12V and Ground. At that time, I have not the least knowledge and a few equipments. The regulator ICs I use IC7812 and IC7912 (hard to bought). I make this circuit. It works great.
notice point
In circuit I use diodes D1, D2, only both because I’d forgotten to add, and this is a low current, using a half-wave diode rectifier enough. and The transformer is 300mA -15V CT 15V that cheap than other sizes.
-IC1-IC2 do not need to hold the heat sinks because the very low currents.
-LED1 is indicator to Power ON that R1 is the current limiter of LED1.
-C1,C2,C3,C4 are first filter that time I has them many so place various 2200uF.
How to built.
This project I put them in peforated board, it easy to use, and so cheap. But at time I put wrong pin capacitor, when entering the power supply, causing it to burst. I was shocked very much.But I do not Discontinued this project.
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Top Linear power supply regulator 5V 5A with 7812 and LM723

noreply@blogger.com (tom) — Tue, 04 Sep 2012 05:16:00 +0000

When you need a power supply often missed the 3 legs Regulator ICs. But some jobs that apply a high current over 1 Ampere up there, is very difficult. Even if it is 5 amp and 10 amp, but the price is quite high.
This project is designed with the concept of the modular regular circuit is using the output. Which is composed of two or more transistors, to current as shown in the circuit. And a control section is not sensitive to noise, which we would have to use IC-723. Although the present may be perhaps was overshadowed with the 3-pin regulator IC. However, with good characteristics, makes us choose to use it for Supply output voltage from 2 to 7 volts.
The voltage for provide IC1-LM723 get from the increasing the voltage and then filtered to smooth. then, through the control the voltage regulator using 3-pin. This method Is good for power transistors, because we make the output voltage and the before into transistor voltage, both difference as little as possible. without prejudice to the power supply voltage of the IC.
- While running two transistors T2 and T2 may be hot we should hold the adequate heat sink and
All resistors R4 to R6 should used many to parallel to the desired value to average Power Dissipation down.

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2 channel 100W min AF Power Amplifier STK4231II

noreply@blogger.com (tom) — Mon, 03 Sep 2012 04:37:00 +0000

If you want to create the 100 watt OCL audio amplifier circuit. I want you to consider this circuit as one. It uses STK4231 IC products to create a simple, small and best economical.
How it works.
The STK4231 is Hybrid IC of Sanyo, in the family of STK4201II. Can provide a high power output to 100 watts per channel. And When connected to the bridge adapter with output altitude of about 400 watts is incredible.
-Built-in muting circuit to cut off various kinds of pop noise.
Greatly reduced heat sink-due to case temperature 125 degrees Celsius.
-Excellent cost performance.

Read more to see PCB and power supply circuits

Balance temperature switch

noreply@blogger.com (tom) — Sat, 01 Sep 2012 08:19:00 +0000

Usually we have seen in this type of equipment, consisting of thermistor or temperature sensor in variations. Around this time, found sensor which will that is new it that new, will be old it is old, Actually, because is known, and then some, I will explain it to someone who knows only
Temperature sensor with a semiconductor devices.
-It is actually, all the semiconductor resistance within. Which decreased when heated, will be very or least it is up to the agents used in the doping process. This includes a semiconductor, resistor, integrated circuit, transistor, etc..
-A diode is a semiconductor device at inexpensive, as compared to other devices, then select is temperature sensor in this circuit.

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5V Low Drop Out Regulator Low Volt by BD438

noreply@blogger.com (tom) — Sat, 01 Sep 2012 04:48:00 +0000

The general regulator circuit, need input voltage is higher than the output voltage. So cannot apply to the input voltage is higher just little than the need voltage. But this circuit you can have the five volt output from input voltage only six volt of the normal battery.

As circuit picture below. The load is connected with collector pin of the transistor output. Connection this way makes transistor works in a saturation. As a result the voltage drop across the collector pin and emitter pin very low (because to be the saturation voltage).
-And this current depends on a type of transistors, Which is set about 0.5 amperes, has a voltage drop is 0.2 volts. But for all circuit need plus with voltage across R6. (Current limiting resistor)
At voltage across R6 is about 0.5 volts. T3 is activated and the output current is limited there. LED-D1 is the second function is indicate working and the reference voltage. Which is set 1.5 volts to 1.6 volts at emitter pin of T1, for base current to drive it works.
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12v to 220v inverter 180w by 2n3055

noreply@blogger.com (tom) — Fri, 31 Aug 2012 07:14:00 +0000

This circuit is converter to use to charge DC12V from the lead-acid batteries to AC 250V for use in a car, Boats or mobile homes. There are the output power There are the sufficient power to the small electronics such as a lamp or electrical soldering iron. In circuit use only six transistors, transformer and a few electronic parts. So it is easy to build and cheap, too.
How it works
-The Q3(BC549) and Q4(BC549) both are the a stable multivibrator (AMV) has output is pulse square wave from about 50 Hz. They will alternately inductor current.
-And the power section also works on push-pull form.
- When Q3 induct current will have the current flows through Q2, making Q1 connects the half coil circuit of the primary transformer with the 12V drop across voltage from battery.
- When Q4 induct current, transistor Q6 will connects the primary coil circuit another one to drop across the replace 12V voltage.
- If you use the transistor in the output section to be number: RCA 40411 will be has the current flows through the primary coil in each time is 10 amperes. To power output (Way secondary coil) is 180 watt. However, if the number 2N3055 power output will be have a 90 watt.

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9V Low Power Switching Regulator

noreply@blogger.com (tom) — Fri, 31 Aug 2012 04:17:00 +0000

This is the Power Switching Regulator 9V Circuit that is low current power output and It has strong point is the voltage input change from 2.4V to 10V but a constant voltage output 9 Volt. We used the RC4193 Micropower Switching Regulator is the base, easy to use and there are a few parts in circuit. The test battery point for check voltage of batter or input.
The low power switching regulator IC, number: RC4193, that that Contained in a small body of caterpillar 8-pin. It is designed for devices that work with batteries. The DC regulator power supply is built by the 11 normal parts. By has the 5 resistors, 2 capacitors, a diode, a choke coil and IC no.RC4193 and that importance the battery 2.4 volt to 9 volt : 1 set.
How it works
-This power supply has stable output voltage at 9V until battery is worn down to less than 2.4V The circuits is actual as shown below.
-The RC4193 has a reference circuit inside, is controlled by the Ic current and is define from the resistor R1 that connected externally to IC1
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Video amplifier splitter by transistor BD137-BC547-BC557

noreply@blogger.com (tom) — Sat, 25 Aug 2012 08:50:00 +0000

This is the video amplifier circuit or the video splitter circuit, it is designed to take video signal is stronger. Compensate for the loss of signal, and is video splitter video, which can connect up to three outputs. so is suitable for display on several television screens, or video tapes recording at the same time too. (Now may will no video tape.)
The advantage of this circuit is cheap, easy and the results are detailed in the circuit below.
How it works
Technical specifications
- Increasing rate Typically, the circuit video amplifier is designed to have low amplifier rates. (it different with the common pre-amp circuit) For our the circuit has the maximum gain ratio is only 4 times.
- Impedance is 75 ohms on both the input and output.
- Bandwidth of this circuit wide is 5 Mhz.
It can be seen that the circuit contains only three transistors. By Q1 (BC547), Q2 (BC557) acts as a signal amplifier, and Q3 (BD139 or BD137) serves as the output circuit of common emitter follower.
The input impedance of circuit is determined by the value of R1. The input signal entered through C2 to the base of Q1. By the VR1 is the set the level of the signal swing.

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Pump control circuit.

noreply@blogger.com (tom) — Mon, 30 Apr 2012 11:30:00 +0000

During the summer. Hot weather over the years. Storage water is very necessary. However, the pump will not do it all the time. Should be opened only when necessary or when water is running better. It is the electronics. Let's ideas about the best pump control circuit. I selected the following circuits. Pump Controller Circuit
Water control
Water sensor alarm

Power Flasher circuits

noreply@blogger.com (tom) — Sat, 27 Aug 2011 16:15:00 +0000

Power Flasher Jan 19, 2009 … micro power flasher draws less than 50 µA. Sunday, October 26th, 2008. Some applications require a circuit to indicate that a battery’s …

Power Flasher with MOSFET Suitable for alerting purposes Drives 12V Car bulbs
Derived from the Two-wire Lamp Flasher design, hosted on RED Free Circuit Designs since 1999, this astonishingly simple circuit allows one or two powerful 12V 21W car bulbs to be driven in flashing mode by means of a power MosFet….

AC light flashing power lamp using SCR This circuit uses a half cycle of AC power Voltage , for feed give with AC Lamp. The part again a half cycle that go to give with capacitor C1. For build voltage to feed reach a pin G of SCR. When arrive at the dot at firing angle SCR will lead the electric current [...]

Lamp 6 volt flashing by two transistor This be Lamp Flasher again model apply to Lamp small-sized 6 Volt, by use the principle Amplifier Circuit that use transistor 2 pcs. By have regenerative feedback send pulse of current 60 mS. Which there is tall size arrives at many amp change low voltage lamp. For brightness rate of something flasher , The tall [...]

micro power flasher draws less than 50 µA Some applications require a circuit to indicate that a battery’s voltage has fallen below a certain value. However, if you don’t frequently check the indicator, the low-battery indicator itself can easily discharge the battery. The circuit in Figure 1 indicates when the battery voltage has dropped below a preset value. The circuit draws less than [...]

AC Load Line Power Flasher by SCR Here is an unusual flasher circuit for 120VAC loads. The circuit is similar to the two-transistor flasher seen in several circuits in techlib.com except that an SCR is used. A little circuit trick is hiding in the selection of the 0.1uF capacitor in series with the 1k resistor. When the SCR is off, this capacitor [...]

Lamp Flasher Current 1A We come to see Lamp Flasher Current 1A that apply to supply Voltage 12V. Which power Transistor of NS number LM195 fixed work and don’t work 1 time per second. For do Light Flasher give with Lamp 12V 1A. Grasping very trend sizes in or Limit Current in of LM195 protect Current at excellent tall [...]

touch alarm circuit

noreply@blogger.com (tom) — Sat, 27 Aug 2011 16:12:00 +0000

Touch Alarm Aug 10, 2010 … Here is a simple shock sensitive alarm circuit that has many many applications fro home to automobiles.The main application of this circuit is to …

Touch Switch Apr 10, 2007 … This circuit uses a LM555 timer as the bases of the touch switch. … More 4959 Circuits schematics Circuit diagram – Burglar alarm systems …

Travel Touch Alarm The Travel Touch Alarm can be used to provide a audible alarm when someone touches the door knob or handle of your hotel room. The door knob or handle must be made of metal for the circuit to work. The main chip in the circuit is a 555 timer which will be triggered if a hand comes close to or touches the door knob….

Simple Knock Alarm With Piezo Sensor This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; eg, a door or table. Basically, it amplifies and processes the signal from the sensor and sounds an alarm for a preset period. In operation, the piezoelectric sensor converts mechanical vibration into an electrical signal. This sensor can [...]

Shock alarm circuit by LM358 Here is a simple shock sensitive alarm circuit that has many many applications fro home to automobiles.The main application of this circuit is to use it as an anti theft alarm in automobiles.A peizo electric sensor is used as the shock sensor which has to mounted on the door which you have to protect. Here [...]

Create music with hand touch Operation of the circuit. In the normal range will not work Piezo Tweeter speakers on tap, but not the point of A Q1 Q2 will flow and the work of the bias voltage fall across R2. And the current flowing into pin 2 of IC1 IC1 make music production work out of three legs with [...]

Touch Switch This circuit uses a LM555 timer as the bases of the touch switch. You can learn more about 555 timers in the Learning section on my site. When the plate is touched the LM555 timer is triggered and the output on pin 3 goes high turning on the LED and the buzzer for a certain [...]

Protects steal touch model by IC741 Contain divide this friends many you may face a problem economical. A steal the very. Today I then beg for to advise the circuit protects steal again model that interesting. It is model to touch , the system will work when , steal touch at the metal detects. When you see the circuit may like [...]

Protection Power Supply

noreply@blogger.com (tom) — Fri, 26 Aug 2011 03:50:00 +0000

Protection Power Supply Feb 21, 2011 … The circuit also produces an alarm when the power supply comes back.An ideal circuit for home to protect your valuable equipments from …

FET Overload Current Trip Circuit FET Overload Current Trip Normally the thing that is worried of power supply circuit , be the occurrence through the circuit of load. Which can happen always. We come to see the circuit FET Overload Current Trip help can protect. By use important equipment is FET pay current give with load. When be born [...]

Logic PSU with Overvoltage Protection by IC 7805 Circuit : Andy Collinson Email: anc@mitedu.freeserve.co.uk Description: A simple 5 Volt regulated PSU featuring overvoltage protection. overvoltage_circuit Notes: The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of voltage transients. These IC’s are easily damaged by short voltage spikes. A fuse will blow when [...]

Simple Fuse Monitor Alarm Â It came to me in a flash. A simple way to see if a fuse has blown without removing it from its holder. Its not often you can design a circuit using just two components, but with just one resistor and an LED this circuit provides visual indication of when a fuse has blown. [...]

TTL Power Supply with Crowbar protection by 7805 and SCR

Power supplies that are intended to be used with TTL logic circuitry must guard against over-voltage, which can destroy TTL chips very rapidly. The duration of over-voltage that can destroy TTL chips is much too brief to trigger any conventional fuse, so that only other semiconductor circuits can play any useful part in protecting a [...]

Uninterruptible Alarm Power Supply by 7805 Although this Power Supply was designed for the Modular Burglar Alarm – it has other applications. It provides an output of 12-volts – at a current of up to 1-amp. In the event of a mains failure – the back-up battery takes over immediately. And when mains power is restored – the battery recharges automatically. [...]

Blown Fuse indicator LED Display A Fuse be the equipment protects that use often most. Because of cheapness can use protect electronics expensive circuit. Generally when fuse torn us can know immediately. but in sometimes Fuse torn already we don’t know. such as in electricity automobile system brake system , the system delays the electric current very much, etc. Fuse [...]

Fuse electronic for ic regulator Power supply, plus the ground, using current up to 1 Amp.Normally used, IC Regulator no. 78XX. When used to power circuits.And the short circuit that occurred.If no fuse various equipment will be damaged.But if there is an electronic fuse circuit for IC number 78XX.Then when the, short-circuit.This circuit will act to stop paying current and [...]

High & Low voltage cut-off with delay& alarm This straight forward circuit will protect electrical appliances from over voltage as well as under voltage.The circuit also produces an alarm when the power supply comes back.An ideal circuit for home to protect your valuable equipments from voltage fluctuations.The same circuit with some modifications can be used to make a automatic voltage stabilizer. When the [...]

Mains Supply Failure Alarm Whenever AC mains supply fails, this circuit alerts you by sounding an alarm. It also provides a backup light to help you find your way to the torch or the generator key in the dark. The circuit is powered directly by a 9V PP3/6F22 compact battery. Pressing of switch S1 provides the 9V power supply [...]

Stabilized Power Supply With Short Circuit Protection Aug 5, 2008 … Stabilized Power Supply 5V,6V,9V,12V and 18V With Short CircuitProtection by IC 7805 , LM7806, 7809,LM7812 Here is an efficient 4-stage …

Protection Circuit Dec 14, 2010 … This is an electrical circuit protection device sound … If you have identified the polarity of the power supply or power supply connector …