I have a optocoupler QTC 4N33 with three that has 9716K and two that has 9630K marking. I had trouble with Isolated bi-directional motor control using two of these 4N33 and two relays. In my troubleshooting, I've finally come to a conclusion not all 4N33 are the same.
one of these (9630K) was able to drive the UTV6-12V-SH and/or 12VDC 30/40A relays, but not the other four. I've tested the other four and it correctly drives the LED light (12v source with 330ohm). the one that worked for my relay does not - it's lit. However, when connected to relay it does tick-noise when controlled from pin1,2 connected to 3.3v source (manual switch); the other four does not.
can someone explain?
one of these (9630K) was able to drive the UTV6-12V-SH and/or 12VDC 30/40A relays, but not the other four. I've tested the other four and it correctly drives the LED light (12v source with 330ohm). the one that worked for my relay does not - it's lit. However, when connected to relay it does tick-noise when controlled from pin1,2 connected to 3.3v source (manual switch); the other four does not.
can someone explain?