Talking about this: https://www.amazon.ca/dp/B00E0NTPP4...4UTADuhCeMsG7dsSZTyRckYoCjSSsEQhp7NsAtaduvKLU They have many versions of them, from 1 relay to 16 on the same board. 5VDC is easy to obtain from the 5VAC tap when you're not running a tube rectifier (I use a Delon voltage doubler to make sure I have enough voltage before the regulator, works like a charm). I've been putting relays on small perfboards in the past to keep the diode and cap close, and it works well. But this is so simple and quite cheap, even has optocoupling baked in. Only takes a few mA's to trigger it. Can't really think of a reason not to try it, worse case I'll be out a few bucks. But was wondering if anyone else has tried it.