This sine wave to square wave converter circuit is expected to provide good square waves changing a sine wave delivered from an existing generator. Its primary feature consists in the fact that no power-source is required: […]
Circuit Schematic Diagram
DIY Simple Multitone Alarm
Here is the circuit diagram of simple multitone alarm. This is a low cost circuit which is simple and easy to build. The main components of this circuit is based on dual op-amp MC1458 and LM […]
Low Noise Portable Mic Preamp
This is the circuit diagram of portable mic preamp. This circuit consumes low current supply (about 2mA), so will have a long battery life for supplying the circuit. Harmonic distortion is about 0.1% @ 1V RMS […]
Stereo Electret Mic Preamplifier
This a simple stereo electret microphone pre amplifier circuit. The below design diagram is the design for single channel, but the design of PCB layout is for stereo design og electret mic pre amp.? For maximum […]
Small Sound Amplifier for Ears (Hearing Aid)
This is the simple project of small sound amplifier for ears or often called hearing aid device or hearing loss amplifier. This circuit was already tested on some patients and give significant improvement in the hearing […]
USB Printer Switch 2 Input Ports
Here is the USB printer switch circuit design with two USB input ports and one USB output port. This a really simple device that allow two computers (desktop/laptop) to select a single USB printer or some […]
5 Band Graphic Equaliser
This is the design diagram of 5 band graphic equaliser circuit build using operational amplifier chips, the NE5532 or LM833. The op-amp ICs is a good choice because of inexpensive and comes with fairly good quality […]
Simple Electronic Siren Based LM358
This is a low cost, simple, yet a surprisingly powerful electronic siren powered by just a 9V battery. The circuit may provide the final circuit block module in an alarm circuit using a relay to activate […]
3A Switching Voltage Regulator based LM317HV
Above circuit diagram is a easy, simple and cheap switching voltage regulator which has capability to deliver adjustable voltage output range of 1.8V to 32V and static electric current of 3A. This regulator use adjustable regulator […]
Low Cost Electronic Rat Repellent
After we present a circuit of electronic mosquito repellent, this time will be continued with a circuit of electronics that are not less interesting, that is electronic rat repellent circuit. Actually the working principles of electronic […]