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May 17, 2009
about 7 years ago
Relays already provide galvanic isolation, so adding an optocoupler between a relay coil and an MCU is redundant in that respect--that's what I suspect tristan was getting at. There are cheaper, more compact ways of dealing with the other issues you mention, especially on an integrated PCB like this.
In this case, it looks like they've got a couple shift registers on that little black interface board driving optocouplers which in turn drive some transistor arrays that finally drive the relay coils. That should give you the ability to run several of these boards from mutually isolated DC (coil drive) supplies, which I guess could be handy in a few cases, but I'm having a hard time thinking of any.
about 9 years ago
Just a note for the next time you revise your retail packaging--it'd be nice if you indicated the battery specs on the box and/or made sure the batteries went into the blister pack with the printing facing out. I almost impulse-bought one of these at Micro Center today, but held off because I didn't know what the capacity was.
News - A New Product Post Cramme…
about 9 years ago
You ought to have a parallel contest to guess the weight of that monster!
about 10 years ago
I believe you're thinking of an S C R. SSRs typically use back-to-back SCRs to provide bipolar operation. Otherwise it wouldn't be terribly useful in most cases for the reasons you mention.