Appliance Timer cum Clap Switch
This is a circuit for an appliance timer cum clap switch that can operate devices with a clap or can switch them on/off by setting an advance timer ranging from one second to 100 hours in advance.
Panic Button
Useful for the elderly and ailing persons, this touch-sensitive panic button circuit sounds a panic alarm to catch the attention of others for immediate...
A Multipurpose Listening Device
This multipurpose listening device can detect very faint, remote sounds with a good clarity. It is useful in large conference halls, auditoria, cinema halls,...
Solid-state Relay
The basic function of a relay is to switch on power to a load using an electrically isolated, low-power control signal. Hitherto, electromechanical relays...
Hidden Alarm Switch
This simple hidden alarm switch produces a warning beep when somebody crosses a protected area in your home or office. The switch, hidden below...
Infrared Electronic Shooting Game
This is a circuit for an infrared electronic shooting game that consists of an IR gun and a target board. It consists of eight red LEDs and a green LED. Green LED lights up when a hit is made at the infrared receiver module and a buzzer sounds.
Touch Sensitive Musical Bell with Timer
Recently musical doorbells have become very common. Musical and continuous power doorbells serve as an attempt to bridge the gap between newer digital circuitry...
Three Colour Display Using Bicolour LEDs
Presented here is a three colour display that uses bi-colour LEDs for display. The circuit is built around two IC CD4017, some transistors & a...
Power Supply Reversal Correcter cum Preventer
When power-supply polarities of an electronic device are accidentally interchanged, the device runs the risk of damage. The danger can be avoided by adding...
Photodiode Based Fire Detector
This ultra-sensitive photodiode based fire detector protects your electronic devices like computer and television set. It uses a photodiode as the fire sensor and...
