I think this is a good example of the practicality, and the style (BOOM!) of The Art of Electronics. This shows very nicely how failing to put a diode across a relay coil can get you into a lot of trouble. Boom, indeed.
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Re: A Pin Drop
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Well, Tom, if you never build another big rig, many of us will miss
reading about them here in the forum. But, and this is coming from a guy
who thus fa...
10 hours ago
Could never figure out why not build the diode into the relay during manufacture?
ReplyDeleteThere are some selected Omron and others that do have the built-in or "catch" diode.
DeleteSee:
https://www.ia.omron.com/support/faq/answer/36/faq03676/
But, true, the vast majority of DC relays do not.
For DC relays, having it built-in could help reduce EMI during the switch transient, by have a slightly smaller current loop or "antenna" if done properly.
73!