Time delay relay circuit

What is a time delay relay circuit? In a time delay relay circuit, relay contacts are closed or open after the preset time interval. Whereas in a normal relay contacts are open/closed immediately when coil is energized. It prevents the damaging effect of voltage spikes or input surge current by … Continue reading

Bicycle USB Charger

This circuit has been developed to add a USB charging port to a bicycle for charging a mobile phone. The input supply for the circuit is produced by a dynamo (6V, 3W dynamo) in the bicycle. The circuit is based on LM2596-5.0. It is a 3A step down voltage regulator. LM 2596 are available in fixed … Continue reading