[GreenKeys] Solid State relays

[Doug Alderdice]

At 03:27 PM 8/25/2010 -0700, scottjohnson1 at cox.net wrote:
>SSR's are also not particularly fast.  You can probably make a quick 
>keying circuit with a darlington opto-isolator and a high voltage 
>MOSFET.  Anybody out there tried?  Seems rather easy.

Eons ago I did just that with an optoisolator and a TIP48 transistor for 
loop keying my ASR33.  Granted it was 20 ma and not 60 ma, but it was still 
~~120VDC, and I think the TIP48's ratings will handle 60 ma.

Doug, KA2WFT