Nick,
I've done something like this before. But I've used it
to control 230 Volts AC. I used MOC3041 Triac OptoCoupler
with a BTA610 Triac to make a Solid State Relay.

Triacs don't turn off even if you take the gate drive off.
That is one of the greatest features of SCRs and Triacs.
Sometimes this latching effect can come in quite handy.
On AC, this makes no difference, unless you want to play with
the AC waveform.

If you really want to test out the Triac, use an AC voltage.
If you turn on the triac and remove the drive, it will turn off
in the next Zero Crossing of the AC line.

SSRs are actually meant for switching AC. They are of little or
no use on DC.

To test the SSR, you may try connecting a small light bulb or something
in series with the SSR and AC Line.

Regards,

Jeethu Rao


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Nick Veys
> Sent: Thursday, August 02, 2001 12:18 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Solid state relay difficulty
>
>
> Hi all, I'm using an Omron G3MB-202P solid state relay, 5V flavor.  It's
> a phototriac.  It's not behaving how I would expect though, hopefully
> someone can clear this up..
>
> Pin definitions:
>
> 1 - load
> 2 - load
> 3 - (+) input
> 4 - (-) input
>
> Here's what I am seeing:
>
> Connections:  to test this I just want to light an LED...
>
> 5V to Anode of 5V LED
> pin 1 - cathode of LED
> pin 2 - ground
> pin 3 - ground
> pin 4 - ground
>
> This is how I start it up.
>
> Now when I apply power to this, of course nothing happens as I expect.
> I then switch over the pin 3 to +5V, the LED lights, as expected, I then
> switch the pin 3 back to ground, the led stays lit.  In fact, no
> arrangement of the input pins (3,4) will make the damn LED shut off, I
> can't break the circuit once it's made...  Doesn't sound too useful of a
> relay!
>
> Hopefully I'm doing something obviously wrong!!
>
> I've tried this with 3 different relays so I doubt they are defective...
>
> Someone please smack me and tell me the simple solution! :)
>
> Thanks all!
>
> -- Nick
>
> nick@veys.com | www.veys.com/nick
>
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