Audio Controlled Running Light
This mains operated audio controlled running light can be used in discotheques. The lamps glow in running sequence as per the sound of music....
Melody Generator With Instrumental Effect
This is a circuit for a melody generator that can provide various modes of melodies along with instrumental effect that can be chosen through dip switches.
Pulse Generator
This pulse generator circuit is very useful while checking/operating counters, stepping relays, etc. It avoids the procedure of setting a switch for the required...
PC Temperature Controller
Here is a simple temperature controller that turns your personnel computer (PC) off when the temperature of the PC increases beyond the optimal temperature value. Some of the larger integrated circuits become quite hot and if the temperature inside the PC
Musical Light Chaser
This music operated lighting effect generator comprises five sets of 60W bulbs that are arranged in zig-zag fashion. The bulb sets glow one after...
Ultrasonic Proximity Detector
This ultrasonic proximity detector comprising independent, battery-powered transmitter and receiver sections makes use of a pair of matched ultrasonic piezoceramic transducers operating at around...
Programmable LED Indicator
In this circuit, IC CD4017 has been used to program a bicolour LED indicator in 10 different modes which can be selected with a single push-button switch.
Wire Break Alarm With Delay
Here is a simple circuit of wire-break alarm that activates after a delay of 15 to 30 seconds. When the thin-wire loop running across the entrance door is broken, the alarm sounds after a delay of 15 to 30 seconds, the time period set through VR1.
Automatic Switch-off Battery Charger
Presented here is an automatic switch-off battery charger based on a 555 timer IC. This smart charger automatically switches off when your rechargeable batteries...
Car Porch Guard
Protect your costly vehicle from theft using this electronic car porch guard system. The system immediately switches on the porch lamp and sounds a...
