Sunday, May 29, 2016

Relay Circuits

Momentary Relay Activation Circuit



The relay will energize momentarily until the capacitor is fully (or partially) charged.



The relay coil produces brief high-voltage spikes when switched off. These voltage spikes can destroy transistors and ICs in the circuit. To prevent damage, a protection diode must be placed across the relay.

Hot-Swap Circuits with Inrush Current Limiter

  To provide continuous current sensing and limiting, this hot-swap circuit uses a PNP transistor and a current sense resistor of 0.333R. Wh...