I had build a circuit that can provide current to 12-V wifi-router from two different sources (wall-adapter & battery.)
A 6-V relay is used as switch, to supply power from one of the source at a time.
Problems with the Circuit:
1. As 6V relay is powered by 12V adapter, It gets hotter by the time passes(1 hour or more).
2. When primary power (wall adapter) goes off there is tiny-bit delay in supply the power to wifi router so it gets restarted.
What should I do to overcome these problems?
Q1. How do I step down from 12V to 6V, to power the relay.
Q2. What kind of capacitor be use for the short term power in delay time?
** Upgrade with capacitor & Relay **
I have added 2200µF 16V Capacitor with diode, before the Load to ensure power could be supplied for the 2-3~ seconds delay while switching between sources. unfortunately capacitor is powering the Relay instead of wifi-router. what should I do to ensure isolated current to wifi-router?
Replace the 6V relay with 12V relay.
Note: I am new to electronics that is why I make circuit as simple as possible. I know I had done some blunders in the circuit. Kindly guide me through.