[GreenKeys] Solid State relays

[Bruce Lane]

	This is because a TTY loop is DC. In order to key it on and off, you should use an optoisolator, rated for the appropriate voltage/current, instead of a SSR (unless, of course, the SSR is specifically rated to switch the appropriate level of DC).

	Most AC SSR's use a photosensitive triac, and triacs require AC to be switched into conduction and return to a non-conductive state. Not sure why (I'm not a semiconductor physics guy), but that's how it is.

	Happy tweaking.

*********** REPLY SEPARATOR  ***********

On 25-Aug-10 at 14:01 Larry Tighe wrote:

>Howdy Folks,
>
>I have a solid state relay, rated at 240 VAC, 20 amps.  It can be keyed
>with 
>6 VDC.  I put the ohm meter (analog) across the AC terminals and it opens 
>and closes the "switch" with 6 VDC.
>
>I tried to key a tty loop with it and it won't close the circuit.  Anyone 
>tried playing with these successfully?  For now, I can't understand why it 
>would show on an ohmmeter with probably 3 volts from the meter and then
>not 
>close with 130 VDC and a 60MA magnet.
>
>lar
>Larry
>K2JIA
>OFC 
>
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