tag:blogger.com,1999:blog-25473284850904490022026-03-08T05:29:11.741-07:00Electronic Projects | Electronic Circuits | Electronic SchematicsUnknownnoreply@blogger.comBlogger459125tag:blogger.com,1999:blog-2547328485090449002.post-22600624784740004912013-08-02T22:58:00.001-07:002013-08-02T22:58:35.278-07:00

A small 325mW amplifier with a voltage gain of 200 that can be used as a bench amplifier, signal tracer or used to amplify the output from personal radios, etc. The circuit is based on the National Semiconductor LM386 amplifier. In the diagram above, the LM386 forms a complete non-inverting amplifier with voltage gain of x200. A datasheet in PDF format can be downloaded from the National

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-15321918492011255812013-08-02T22:57:00.001-07:002013-08-02T22:57:59.145-07:00

The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown here combines the functional diagram of the TDA8551 with its typical application circuit. The gain of the amplifier can be set by the digital

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-8419123407618423872013-04-07T12:49:00.000-07:002013-04-07T12:49:02.260-07:00

When it comes to driving a servo you typically have to send a PWM signal to the servo input. The frequency of this signal is about 50 Hz and the duty cycle is variable. The duty cycle is usually between about 5 and 10%, corresponding with a pulse width of about 1 to 2 ms. The conversion of a resistance value into a PWM signal is fairly straightforward when a variable RC time constant circuit

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-34214087351659993702013-03-20T22:39:00.000-07:002013-03-20T22:39:01.435-07:00

Normally, chargers available in the market do not have any sort of control except for a ro-tary switch that can select different tap-pings on a rheostat, to vary the charging current. This type of control is not adequate because of the irregular fluctuations in the mains supply, rendering the control ineffective.  A simple circuit intended for automatic charging of lead-acid batteries

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-91376661887735840922013-03-20T22:36:00.001-07:002013-03-20T22:36:42.148-07:00

Here's a simple VHF FM transmitter that could be used to play audio files from an MP3 player or computer on a standard VHF FM radio. The circuit use no coils that have to be wound. This FM transmitter can be used to listen to your own music throughout your home. When this FM transmitter used in the car, there is no need for a separate input to the car stereo to play back the music files from

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-70082504404040417782013-03-20T22:34:00.002-07:002013-03-20T22:34:34.336-07:00

This circuit drives a 3x3x3 cube consisting of 27 white LEDs. The 4020 IC is a 14 stage binary counter and we have used 9 outputs. Each output drives 3 white LEDs in series and we have omitted a dropper resistor as the chip can only deliver a maximum of 15mA per output. The 4020 produces 512 different patterns before the sequence repeats and you have to build the project to see the

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-28708081697251797542013-03-20T22:32:00.002-07:002013-03-20T22:32:56.958-07:00

Here’s a simple, low cost, and easy to construct infrared remote control tester. The tester is built around an easily available infrared receiver module (TSOP 1238). Circuit Diagram:  IR Remote Control Tester Circuit Diagram Normally, data output pin 3 of the IR receiver module is at a high level (5 volts)and as such driver transistor T1 is in cut-off state. Whenever the IR

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-35354505092846131002013-03-15T22:11:00.005-07:002013-03-15T22:11:46.834-07:00

The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts. It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier. Resistor R1 provides the necessary bias for the condenser mic while preset VR1 functions as gain control for

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-23008037237571173592013-03-15T22:11:00.001-07:002013-03-15T22:11:08.910-07:00

For some time now, there have been a number of tape cassette decks available at low prices from mail order businesses and electronics retailers. Such decks do not contain any electronics, of course. It is not easy to build a recording amplifier and the fairly complex magnetic biasing circuits, but a playback amplifier is not too difficult as the present one shows. The stereo circuits in the

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-3684728384085196262013-02-27T11:11:00.003-08:002013-02-27T11:11:22.792-08:00

Can be fitted into a packet of cigarettes, Also suitable as Fuzz-box This small amplifier was intended to be used in conjunction with an electric guitar to do some low power monitoring, mainly for practice, either via an incorporated small loudspeaker or headphones. The complete circuit, loudspeaker, batteries, input and output jacks can be encased in a small box having the dimensions of a

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-71030343093589469632013-02-27T11:10:00.003-08:002013-02-27T11:10:48.498-08:00

Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage is that there is no need for the complication of a second (symmetric) power supply; another is good frequency and phase response. Also, no special electrolytic capacitors are needed for voltage stabilisation, and switch-on ‘thump’ is much

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-51310129578241885802013-02-27T10:29:00.005-08:002013-02-27T10:29:57.610-08:00

Amplifiers which run from 12V DC generally don’t put out much power and they are usually not hifi as well. But this little stereo amplifier ticks the power and low distortion boxes. With a 14.4V supply, it will deliver 20 watts per channel into 4-ohm loads at clipping while harmonic distortion at lower power levels is typically less than 0.03%. This is an ideal project for anyone wanting a

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-2761649714491387892013-02-27T10:28:00.000-08:002013-02-27T10:28:01.244-08:00

It's based on a Philips class-H audio amplifier IC and can deliver 36W RMS OR 70W music power, all from a 13.8V supply. Our new Mighty Midget Amplifier can really pack a punch - around 36W RMS continuous into a 4-ohm load when using a 13.8V supply. However, it's the 70W of output power that it can deliver during dynamic (music) signal conditions that really make you sit up and take

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-39537572621799465002013-02-27T10:27:00.001-08:002013-02-27T10:27:28.102-08:00

45W into 8 Ohm - 69W into 4 Ohm, Easy to build - No setup required These goals were achieved by using a discrete-components op-amp driving a BJT complementary common-emitter output stage into Class B operation. In this way, for small output currents, the output transistors are turned off, and the op-amp provides all of the output current. At higher output currents, the power transistors

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-79786190591637149692013-02-27T10:26:00.001-08:002013-02-27T10:26:07.937-08:00

High Quality, powerful unit: 90W into 4 Ohm load, Also suited as guitar or bass amplifier To celebrate the hundredth design posted to this website, and to fulfil the requests of many correspondents wanting an amplifier more powerful than the 25W MosFet, a 60 - 90W High Quality power amplifier design is presented here. Circuit topology is about the same of the above mentioned amplifier, but

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-68780805166884745932013-02-27T10:21:00.001-08:002013-02-27T10:21:06.683-08:00

Battery-Powered portable unit, Suitable for all type Televisions Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and Loud Speaker. In place of a pair of wires, it uses invisible infra-red light to transmit audio signals from TV to Loud speakers, Without using any lens a range of up to 6 meters is possible.

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-40170213556514245822013-02-27T10:19:00.000-08:002013-02-27T10:19:02.379-08:00

Useful circuit for self-powered speakers, Radios, TV, can be used as car power amplifier Here is the schematic for an 8 watt audio power amplifier. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. It is very small and portable unit and can be powered through 12V battery. I built the circuit on a Vero Board and had to add extra

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-68562039756159518012013-02-27T10:17:00.002-08:002013-02-27T10:17:30.260-08:00

Low distortion Class-B circuitry, 6V Battery Operated Some lovers of High Fidelity headphone listening prefer the use of battery powered headphone amplifiers, not only for portable units but also for home "table" applications. This design is intended to fulfill their needs. An improved output driving capability is gained by making this a push-pull Class-B arrangement. Output power can reach

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-47466478795755102012013-02-27T10:13:00.005-08:002013-02-27T10:13:58.721-08:00

Including Preamp, Tone Controls, Reg dc Power Supply, 18 Watt into 8 Ohm - 30W into 4 Ohm loads This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-3145008626041311642013-02-27T10:10:00.004-08:002013-02-27T10:10:37.181-08:00

Portable and small unit, Can be built on a veroboard Firstly, I'd like to stress that the intended use of this circuit is only one of many possible applications. Apart from the obvious usage as a headphone amplifier, the circuit can be used for a range of applications where a wide bandwidth low power amplifier is needed. The circuit is based on an opamp, with its output current boosted

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-38165004845924156742013-02-27T10:05:00.002-08:002013-02-27T10:05:16.920-08:00

Small but powerful multipurpose amplifier This small amplifier is constructed around the TDA2003 IC, capable of delivering 4Wrms at 4ohms. The TDA 2003 has improved performance with the same pin configuration as the TDA 2002. The additional features of TDA 2002, very low number of external components, ease of assembly, space and cost saving, are maintained. The device provides a high output

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-57225833677705047772013-02-27T10:03:00.006-08:002013-02-27T10:03:42.863-08:00

3V Battery powered, High Performance unit This amplifier can be directly connected to CD players, tuners and tape recorders. It is tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohm.Schematic shows left channel only. B1, SW1, J1 & C3 are common to both channels. R3 value was calculated for headphone impedance up to 300 Ohm. Using 600 Ohm

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-7634276729234638682013-02-27T10:03:00.001-08:002013-02-27T10:03:06.299-08:00

High Quality simple design, No need for a preamplifier This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I originally built this thing, it was because I needed a 25 Watt PC amp and did not

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-39469326410745462292013-02-27T10:02:00.000-08:002013-02-27T10:02:06.094-08:00

Simple circuit, No cross-over distortion This solid-state push-pull single-ended Class A circuit is capable of providing a sound comparable to those valve amplifiers, delivering more output power (6.9W measured across a 8 Ohm loudspeaker cabinet load), less THD, higher input sensitivity and better linearity. Voltage and current required for this circuit are 24V and 700mA respectively,

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2547328485090449002.post-10509998184676113842013-02-27T10:01:00.000-08:002013-02-27T10:01:00.283-08:00

High Quality unit, No need for a preamplifier Circuit Diagram: Headphone Amplifier Circuit Diagram Parts: P1 = 22K R1 = 560R R2 = 10K R3 = 10K R4 = 12K R5 = 2.2R R6 = 2.2R R7 = 22R-1/2W Q1 = BC337 Q2 = BC327 Q3 = BC337 Q4 = BC327 C1 = 1µF-63V C2 = 100µF-25V C3 = 100µF-25V C4 = 100µF-25V C5 = 22pF-63V C6 = 22µF-25V IC1 = NE5532 J1 = RCA audio input

Unknownnoreply@blogger.com0