Optical Remote Switch
Using this optical remote control, you can switch on/off any electrical or electronic load. Like any remote control system, it has a mini transmitter unit and a receiver unit to activate the relay.
Infrared (IR) Illuminator
Infrared (IR) illuminators are widely used to improve the image-capturing quality of security cameras fitted in dark zones. Just like our eyes, cameras also...
Low-cost Intercom Circuit Using Transistors
This is a circuit for a low cost intercom that is made by using transistors.
Sound Operated Lamp Switch
This inexpensive, fully transistorised sound operated lamp switch is very sensitive to sound signals and turns on a lamp when you clap within 1.5...
Smart Battery Protector Using a Shunt Regulator
The life expectancy of a battery dramatically reduces when it is discharged below the minimum recommended battery voltage. You must disconnect the load before...
Infrared Toggle Switch
This infrared toggle switch can be controlled by any TV/VCR remote operating at 38kHz frequency. The circuit uses readily available, low-cost components and can be assembled on a small veroboard.
Simple HF Power Amplifier
Here is an inexpensive but powerful high frequency power amplifier for the 40m (7MHz) band. The circuit accepts only 20-30mW RF power and amplifies...
Teleconferencing System
This is a circuit for teleconferencing system that can be used to conference two telephone calls on two separate telephone lines.
Infrared Bug
This infrared bug circuit can be used to detect the presence of modulated infrared signals in its vicinity from any electronic source, for instance,...
Smart Vibration Sensor
Machines nowadays require optimum parametes to operate at their best. Some operating conditions concerns include themperature extremes, magnetic intereference, vibration & electromagnetic intereference among...
