| Post 14 made on Saturday December 17, 2016 at 18:39 |
Ernie Gilman Yes, That Ernie! |
Joined:
Posts: | December 2001
30,104 |
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EVERY relay powered by DC should have a diode across it, connected such that it does not conduct the electricity sent to close the relay. When the relay is turned off, the collapse of the magnetic field of the relay coil creates a voltage spike that can sound like a click in your audio. I use a 1N4003 or 1N914 for this.
Yes, if you have four relays, each relay should have its own diode. There's no point in having a diode across a relay ten inches of wire from a relay that' creating a spike. Short it out at the relay, not at the adjacent relay.
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