Using optocouplers for switching

[tubesornothing]

I notice mojo makes a generic switch board using roach style optocouplers.  Anyone ever try this?  Care to share what you used for the photocell and LED?



https://www.mojotone.com/item.asp?pid=570930&pg=44991&id=5352105

[tubesornothing]

So found out some more info.  15 ohms on resistance, 5Mohms off resistance and can handle 150VDC.  Thats pretty good.

Hmm, looking up in digikey, it looks like the best I can find has 5-10k on resistance at 10lux , that might be OK for in series, but for shunt, that'll leak.  I wonder how much lux an LED puts out, and if it can drive it down to like 100R?

With a photocell I found in the bucket it seems to on/off times might be satisfactory.  I guess it'll take some experimenting.

[PRR]

> 15 ohms on resistance, ..  Thats pretty good.

Also pretty unlikely.

I've worked hard to get a photo-R down to 500 ohms. 100 is possible. 5 is fantastic.