How to build Simple   5 V USB Solar Charger   (No Battery)? Charge phones/power 5 V gadgets directly in sunlight. Chosen specs Panel:  15 ...

This is the Simple 100W Inverter Schematic Diagram. An inverter will convert the DC voltage to an AC voltage. In most cases, the input DC ...

The door opener derives its power from a 9-V battery. A momentary-contact switch, 52, is provided in the event that manual opening and ...

This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail. Simple Emergency Siren Simulato...

Even the best car alarm is useless if you forget to set it upon leaving your car, whence this circuit. The relay has a make and a break ...