tag:blogger.com,1999:blog-86220075521140303742026-01-27T18:42:11.546-08:00collection of electronic circuits, schematic diagrams and projectsUnknownnoreply@blogger.comBlogger240125tag:blogger.com,1999:blog-8622007552114030374.post-41458151653480390842012-06-29T23:35:00.000-07:002012-06-29T23:50:53.784-07:00

Another simple audio amplifier circuit, but this time it uses LM317 regulator IC. The amp can deliver 1W power max and needs only few parts.  This circuit is originally from  vegmatic1966 youtube channel. schematic diagram of LM317 audio amp Part List: C1, C3 - 10uF electrolytic capacitor rated 16V C2 - 470uF electrolytic capacitor rated 16V R1 - 470 ohms 1/

Unknownnoreply@blogger.com18tag:blogger.com,1999:blog-8622007552114030374.post-13083448682221303232012-02-23T03:46:00.004-08:002012-02-23T04:08:24.834-08:00

Below is the archive of different electronic projects listed in different electronic circuit categories. 1.5V Circuits - list of circuits powered by 1.5V or below 555 IC Circuits - projects using 555 timer Alarm Circuits - simple alarm circuits (touch , temp, etch) Audio Circuits - amplifiers, audio booster Auto/Car Circuits - used in vehicles or cars Battery Chargers - different

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-42578749747834527392012-02-23T03:46:00.003-08:002012-02-23T03:46:48.721-08:00

Listed below are electronics and engineering calculators Simple Calculator - can be used for simple arithmetic calculation 555 Timer Calculator - monostable, bistable calculator of 555 timer IC Battery Life Calculator - calculate how long your battery will last KW to Hp Converter  LC Calculator - calculate inductance, capacitance and frequency LC calculator Ver2  LED

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-25643537681348489412012-02-23T03:46:00.002-08:002012-02-23T03:46:37.161-08:00

These are the lists of tips and steps on "How to" or "What to" do in electronics. How to make Printed Circuit Board (PCB) - how to make your pcb in your home MORE UPDATES TO COME.......

Unknownnoreply@blogger.com3tag:blogger.com,1999:blog-8622007552114030374.post-17904608119677275412012-02-22T02:48:00.000-08:002012-02-22T05:10:56.410-08:00

This circuit is a simple temperature controlled relay. The relay activates when the preset temperature is reached. Initially, thermistor (temperature sensitive resistor) R1 has 10 kilo ohms resistance at room temperature. As the temperature rises, its resistance drops. When the resistance of R1 is lower than the combined resistance of R2 and POT, comparator will output high and activates Q1 and

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-67312664063416654612012-02-19T14:14:00.000-08:002012-02-19T14:14:44.488-08:00

During night time, LDR (light dependent resistor) resistance is high, making the circuit off. On the other hand, during day time, the relay is energized. Potentiometer POT1 controls the sensitivity of the circuit to light intensity. Increasing the resistance of POT1 helps the circuit trigger even in less lighted environment, while decreasing the potentiometer

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-23047787008131855652012-02-18T07:20:00.000-08:002012-02-22T05:41:52.552-08:00

The circuit uses transistors formed in a high gain (Darlington pair) configuration. When the plate is wet, transistors Q1 and Q2 turn on and activate the relay. Water Activated relay Schematic Part List: R1 - 2.7 kilo ohms 1/4W R2 - 1 kilo ohms 1/4W D1 - 1N4148, 1N4001 or similar diode Q1, Q2 - 2N2222, 9013 or similar NPN transistor  RLY - any 4V to 6V relay. TOUCH PLATE -

Unknownnoreply@blogger.com4tag:blogger.com,1999:blog-8622007552114030374.post-76912926353997378802012-02-18T06:11:00.000-08:002012-02-18T06:11:59.247-08:00

This simple lamp circuit is made of very few materials. It uses high intensity white LEDs. The circuit is current regulated thus the LED is protected even the supply voltage is variable. The operation of the circuit is very similar to LED driver using LM317 regulator. The current is controlled by resistor R1 with the formula: Current = 1.2V/R1 Current regulated LED lamp schematic

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-78735062953551640282012-02-18T05:11:00.000-08:002012-02-22T04:51:40.659-08:00

When there is no light, the light dependent resistor or LDR have a very high resistance, several Mega-ohms. When there is illumination in the surrounding, the LDR resistance drops to several kilo-ohms, this time it will activate transistor Q1. When Q1 is on, the musical UM66T IC will turn on and will generate sounds to the speaker via transistor Q2. You can use 3V to 3.6V

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-86582543838567835092012-02-16T05:21:00.000-08:002012-02-22T04:51:40.704-08:00

Another simple water detector circuit using Nand in 4093b IC. The idea of the circuit is similar to rain alarm circuit that when the sensor is wet, it will activate the relay. You can use the relay to drive motors or any device. water detector schematic Part List: R1 - 470 kilo ohms 1/4W R2 - 10 Mega ohms 1/4W C1, C2, C3, C4 - 10nF capacitor D1, D2 -1N4148 or similar diode D3 - 1N4001 or

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-1101486033407517082012-02-15T04:14:00.001-08:002021-11-03T03:18:01.460-07:00

TO92 pins Basically transistors in this package are low cost, low power and general purpose types. The list below are the common transistors in TO-92 casing. Transistor coding A - Transistor name B - Maximum Power Dissipation C - Maximum Collector to Emitter voltage D - Maximum Operating Frequency E - Maximum Collector Current F - Transistor common use NPN

Unknownnoreply@blogger.com2tag:blogger.com,1999:blog-8622007552114030374.post-15468562336250278772012-02-14T05:02:00.000-08:002012-02-22T05:46:38.184-08:00

The use of this circuit is similar to 12V to 24V converter ver1 that is to increase voltage to 24V. This converter can deliver an output current around 500mA and uses only op-amp and transistor, thus very cheap to construct. You can calibrate the output voltage by simply adjusting the potentiometer R7. 12V-24V dc-dc schematic Part List: R1, R2, R3, R4, R6, R8 - 120 kilo ohms 1/4W R5

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-30147086810624813842012-02-13T03:40:00.000-08:002012-02-13T04:00:13.810-08:00

This circuit can be used to ruin or jam infrared remote signal from TV or sound system. Its use is basically the same as the TV remote jammer, but this one uses only transistor and no IC required. Remote jammer schematic Part list: R1 - 33 ohms 1/4W R2 - 1 kilo ohms 1/4W R3 - 10 kilo ohms 1/4W R4 - 100 kilo ohms 1/4W R5 -  120 kilo ohms 1/4W C1 - 22uF

Unknownnoreply@blogger.com5tag:blogger.com,1999:blog-8622007552114030374.post-62074454243984409802012-02-12T03:59:00.000-08:002012-02-13T04:00:47.105-08:00

This UPS has a regulated and uninterrupted 5V output. This type of UPS is very useful to low power 5V devices, microcontrollers, and some memory modules. This UPS design has a very stable 5V output but the drawback is very low efficiency.  5V UPS schematic Part List: R1 - 39 ohms 1/2W D1, D3, D4 - 1N4001 or similar diode D2 - 13V zener rated

Unknownnoreply@blogger.com5tag:blogger.com,1999:blog-8622007552114030374.post-9568183668587914002012-02-11T06:49:00.000-08:002012-02-11T06:49:00.768-08:00

This is a simple 6V UPS circuit that you can use to device that plays a critical function and needs not be interrupted .This UPS is much cheaper compared to the 12V version since it uses only transistor and no IC. UPS schematic Part List: R1, R3 - 560 ohms 1/4W R2 - 1 kilo ohms 1/4W D1 - 1N4736A or any 6.8V zener diode D2 - 1N4001 or similar diode LED - red LED or any low power LED ( see

Unknownnoreply@blogger.com4tag:blogger.com,1999:blog-8622007552114030374.post-46540663213490924262012-02-10T06:12:00.000-08:002012-02-22T05:18:54.180-08:00

This is a very cheap NiCd charger with overvoltage control. The charger is very similar to Ni-Cd charger version 1 , but much simplified and specifically designed for 12V NiCd. The charger have current and voltage control. -Charging current is around 100mA but you can change it using the formula : (Vd1 - 0.7) / R2; where Vd1 is voltage of zener D1. -Cutoff voltage is limited to

Unknownnoreply@blogger.com2tag:blogger.com,1999:blog-8622007552114030374.post-30357007868623303262012-02-10T02:23:00.000-08:002012-02-22T05:15:25.106-08:00

A cheap pre-amp for microphones using transistors. The input audio signal is amplified around 120 times. Pre-amp schematic Part List: R1, R2, R5 - 120 kilo ohms 1/4W R3, R6 - 12 kilo ohms 1/4W R4 - 100 ohms 1/4W C1, C2, C4 - 100nF capacitor C3 - 10uF electrolytic capacitor rated 16V Q1 - 9013, 2N2222 or similar NPN transistor Q2 - 2N3906 or similar PNP transistor INPUT - use

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-38568303077287289712012-02-09T01:57:00.000-08:002012-02-09T02:44:52.668-08:00

This is a very simple calculator that you can use for simple calculation

Unknownnoreply@blogger.com4tag:blogger.com,1999:blog-8622007552114030374.post-63223938963961227642012-02-08T07:13:00.000-08:002012-02-22T05:10:56.507-08:00

This simple circuit will help you monitor your 220V or 110V AC line if it is available or not. The circuit can be connected to a microcontroller or computer for monitoring purposes. Circuit uses opto-coupler thus the AC line is isolated from your monitoring device. schematic diagram Part List: R1 - 470 kilo ohms 1/4W R2 - 1.2 Mega ohms 1/4W R3 - 5.6 kilo ohms 1/4W C1 -

Unknownnoreply@blogger.com5tag:blogger.com,1999:blog-8622007552114030374.post-86600643543292844522012-02-08T04:45:00.001-08:002021-11-03T03:18:58.357-07:00

This simple transmitter can transmit FM (frequency modulation) signals more than a mile away. Adjust trimmer C9 to fine tune the transmitter and use battery as a source to minimize noise.Part List: R1, R3, R9, R10 - 10 kilo ohms 1/4W R2 - 22 kilo ohms 1/4W R4 - 100 kilo ohms 1/4W R5 - 1.2 kilo ohms 1/4W R6 - 47  kilo ohms 1/4W R7 - 120 ohms 1/4W R8 - 390 ohms 1/2W

Unknownnoreply@blogger.com7tag:blogger.com,1999:blog-8622007552114030374.post-67370768113688042712012-02-07T22:27:00.000-08:002012-02-22T05:15:25.144-08:00

What this circuit does is boost the audio signal from microphone, guitar or any sound generator. It amplifies signal from millivolts to few volts but it increases also its impedance thus connecting the 8 ohms speaker directly to the output will not work. You can series this circuit to a buffer circuit to convert this high impedance to low impedance. audio booster schematic 2N222 pinouts

Unknownnoreply@blogger.com3tag:blogger.com,1999:blog-8622007552114030374.post-63603039937758622622012-02-06T22:18:00.000-08:002012-02-06T22:20:50.105-08:00

This is a regulated negative power supply circuit using the 79xx IC series. These regulators can deliver current around 1.5A at a fix negative voltage. The common regulated voltages are -5V, -6V, -8V, -9V, -10V, -12V, -15V, -18V, and -24V. The regulator IC is the complement of 78xx regulator IC. Negative power supply schematic Part List: T1 - see minimum input voltage below for reference D

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-18188263080430661412012-02-06T18:44:00.000-08:002012-02-06T18:44:22.666-08:00

This is a regulated power supply circuit using the 78xx IC series. These regulators can deliver current around 1A to 1.5A at a fix voltage levels. The common regulated voltages are 5V, 6V, 8V, 9V, 10V, 12V, 15V, 18V,  and 24V. It is important  to add capacitors across the input and output of the regulator IC to improve the regulation. general schematic diagram Part List: T1

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8622007552114030374.post-59252600752755317762012-02-06T02:43:00.000-08:002012-02-22T04:51:40.408-08:00

Another simple touch alarm that uses 555 timer IC. schematic diagram 555 IC pinout Part List: R1 - 5.6 Mega ohms 1/4W R2 - 47 kilo ohms 1/4W R3 - 1 kilo ohms 1/4W C1 - 22uF electrolytic capacitor rated 16V LED - red or any LED (see led info to know more) BUZZER - any 5v to 12v buzzer 555 IC - LM555 or any timer IC Other versions: Simple Touch alarm Touch switch using Transistor

Unknownnoreply@blogger.com2tag:blogger.com,1999:blog-8622007552114030374.post-10533174012377607332012-02-04T22:58:00.001-08:002021-11-03T03:19:33.784-07:00

What this circuit does is when you push the push-button PB1, it will make your headlight turns on for several seconds or minutes then it will turn off. The idea of this is when you push PB1, the capacitor C1 will charge and transistors Q1 and Q2 are on. During this instant, the bulb is on. When PB1 is open, the charge will drain to the resistors R1 and R3 until the capacitor voltage

Unknownnoreply@blogger.com0