Solar Powered Pedestal Lighting System
This solar-powered pedestal lighting system uses power LEDs for lighting. Solar energy is first converted into DC electricity by a solar photovoltaic cell and used to charge a storage battery.
3V PC Adaptor
Plug this circuit into the available USB output port of your PC to get 50mA, 3V DC. So it can be used to recharge, for instance, two NiCd cells (1.2Vx2) of a portable music player system.
Voltage Based Controller For Switches
Here’s a simple voltage based controller circuit for controlling four switches from a distance through just a pair of wires.
Voltage based controller circuit
In the...
Low-Cost Battery Charger
Here is a very simple and low-cost charger for 12V, 7Ah lead-acid batteries. It can also be used for powering automobile engines and emergency lighting systems.
Clock Controlled Timer Circuit
With this simple clock controlled timer, you will never again miss your favourite TV or radio programme. The TV or radio will switch on...
Miniature Strobe Light
Strobe lights are widely used by disco lovers to create wonderful visual effects in disco halls and auditoria. The circuit of a battery operated...
Mobile Theft Alarm
This circuit works as a mobile anti-theft system. It produces a loud chirping sound whenever someone tries to take away the mobile and also works as a mobile charger.
Aquatic Probe
A number of environmental factors including light and temperature affect fish culture. The temperature of water has profound effect because fish cannot breed above...
Geyser Timer
This geyser timer circuit sounds an alarm after the set timing of 22 minutes when the water is heated up.
Geyser timer circuit
The circuit comprises...
Electronic Fuse
An absolute necessity of every electronics lab is a workbench power supply. The power supply should be regulated and protected against short circuit. Most...
