Sensitive Field Strength Meter

Description: This Field Strength Meter is simple and also quite sensitive. It uses an ordinary digital voltmeter to measure RF signal stre...

FM Transmitter with Opamp

Circuit Of FM Transmitter with Opamp   Parts List: R1 4K7        R4 150K     R7 3K9 (2K7) R2 4K7        R5 220R     R8 120R (82R) R...

Composite color video signal travels on twisted-pair cable

Telephone lines and local-area networks commonly use inexpensive twisted-pair cables. Video-system designers can also take advantage of thi...

Video Switch Circuit Schematic Diagram

Installing the camera everywhere is becoming feasible now, thanks to the decreasing price of security cameras. However, providing a dedicate...

4 Stage 555 Timer for Video Cam Control

4 Stage 555 Timer for Video Cam Control schematics SW1-LED and R14 are an optional test indicator for setting up the cam. C5,6,7 and 8 ar...

Fire alarm circuit

Description. Many fire alarm circuits are presented here,but this time a new circuit using a thermistor and a timer to do the trick. The c...

Automatic LED Emergency Light

Description This is the circuit diagram of a low cost emergency light based on white LED.The white LED provide very bright light which t...

Magnetic field meter

These days when electronic circuits can be found almost anywhere, there is, some people fear*, a different kind of environmental pollution. ...

MINIMAL LM3875 CHIP AMP (GAINCLONE)

The schematic for the chipamp is shown below in Figure and consists of just three resistors. This is very similar to the many gainclone ampl...