Led phototheraphy circuit

While doing a research across the web, I notice the topic about phototherapy. It says that exposure to a light at specific wavelength is be...

Infrared Remote Control Tester

This is a fairly easy circuit that can be used to test TV and VCR remote controls. The infrared detector module (GP1U52X) (Radio Shack 276...

Decibel Meter

The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a tra...

AC Line Current Detector

This circuit will detect AC line currents of about 250 mA or more without making any electrical connections to the line. Current is detect...

Touch Activated Light

The circuits below light a 20 watt lamp when the contacts are touched and the skin resistance is about 2 Megs or less. The circuit on the l...

Low Frequency Sinewave Generators

The two circuits below illustrate generating low frequency sinewaves by shifting the phase of the signal through an RC network so that osc...

Simple Power Amplifier Circuit [2N3055]

Simple Power Amplifier Circuit Diagram Transistors: Tr1 BCY70 (or BC 182L or BC212L or BC214L) Tr2/3/4 BFY50/51 Tr5 BFX88 Tr6/7 2N3055 Risk ...

Mono to Stereo Audio Signal Circuit Converter

This circuit is used to convert a mono audio signal into a stereo signal that can be panned between the left and right channel by a 0-10V co...

LED Audio Level Meter Circuit

This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a ...

OCL Power Amplifier Circuit MJ15003,MJ15004

This Power Amp OCL 100 watt circuit by transistors.They has been an old circuits, but very well amplifier schematic. We use only all transis...

Transistor Inverter circuit 12V to 220V 100W

This circuit power Inverter 100W, it easy and good ideas. When use the electric appliances that want 220V AC 50HZ, which have small-sized ab...

Inverter Circuit 12VDC to 220V 50Hz 500W

This is circuit Inverter 12VDC to 220V 50Hz 500W. It easy to make and Low cost. Friends favorite circuit about the the inverter, because lik...

0-300V Variable High Voltage Power Supply

Here is the variable high voltage dc power supply circuit, which we can customize the output voltage from 0 to 311Vdc, and it is protected t...

Adjustable Power Supply 1.2 – 30V 5A using LM338

If you want to a variable dc voltage power supply circuit during 1.2V to 30Vdc and can provide a current maximum to 5A. We may be have the m...

Circuit High-Voltage Generator with HEX FET

The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can us...

Subwoofer Speaker box design

The order of 4 or sealed rear chamber bandpass system is essentially a system of watertight enclosures with the addition of an acoustic filt...

Automatic detectors water tank pump circuit

This is a circuit detectors on the water pump. This circuit works automatically when the water is discharged to storage tanks or redundant. ...

Doorphone Intercom Circuit

For the first time, this circuit is the design of the Canadian / English language and was designed by Mr Laurier Gendron of Burnaby in Briti...

Emergency Light, & Flashlight

3 in 1 - LED Night Light, LED Emergency Light and LED Flashlight; Length: 4.0". The Night Light has an Automatic Sensor which allows On...

Automatic water tank level controller circuit

Automatic water level controller circuit is a simple engineering project. It can automatically switch ON and OFF the domestic water pump set...

Temperature Candle Using LED

LED based projects require a lot of skill and hence only experienced circuit designers try out these circuits. But there are also a few circ...

120 Volt 4 LED Light Circuit

This circuit uses can exist used in the same way as a night light. It uses a 120 V Mains to power the circuit. plant like a charm! Example C...

Dual-Mode Microphone Pre-Amplifier

This is a microphone pre-amp which I designed intended for function with a SoundBlaster(TM) AWE 64 charge sound license; but it be supposed ...

20 Watt Power Amplifier Circuit

This IC hew was designed specifically used for bring into play trendy power boosting applications in automobiles. It is self caring aligned ...

Dayton Audio 150W Power Amplifier

Dayton Audio's versitile APA150 can liberate 75 watts into 2 channels, or else 150 watts into 8 ohms what time hard to suspension bridge...

Simple battery charger circuit with battery indicator

This is a simple circuit of 12V rechargeable smart battery charger circuit. You can use this best battery charger circuit as car battery cha...

Error Correction Output Stage for Mosfet and BJT Power Amplifier

For best results, any active device with the exception of the output transistors operating in class A. This is to avoid bias to saturate or ...

High-End Power Amplifier Wiring Circuit

As the causes of the heat sink mounting surface to approximately 6 mm from the edge of the circle are fixed, assuming that the amplifier cir...

PCB Layout Power Amplifier LM4780

I get different boards for LM4780 based amplifier designed when I was several samples from National Semiconductor. I was one-sided copper bo...

Car Audio Amplifier Instalation Guide

Amplifier and speakers wiring. The amplifier does not always come with wire connection. You need a kit amp wiring harness sold separately. I...

Stereo to surround sound systems

Circuit quad amplifier or stereo to surround sound systems using the ic tda7375 to power of 7 watts per channel amplifier version quad or du...

1000 Watts Power Amplifier - 2SA1216 2SC2922

The DIY 1000 Watts Millenium Amplifier Sanken Power Transistors 2SA1216 2SC2922 Has also shown live on board DC power (a second kind of orde...

5.1 Classic Home Theater System - Energy

Low Distortion and Resonance - spokesman method is distortion- otherwise resonance-without charge, but Energy has achieved a significantly d...