[GreenKeys] Is there a solid-state equiv. for a polar relay

[Jeffrey Angus]

On 1/30/18 8:13 AM, Albert Last wrote:
> I need to key my Kenwood TS950 for FSK in my 60 ma  loop with
> a dry set of contacts. Is there a solid state simple good device
> that replaces the old polar relay?
A bridge rectifier, a few resistors and an opto-coupler like a 4N27.
The bridge rectifier make the "relay" non-polarity sensitive.

A note on polar relays: When used in a 60 mA non-polar (on/off)
loop, they had their second coil biased at 30 mA to switch it to Space
when the Mark (60mA) signal disappeared.



-- 
"I am a river to my people."
Jeff-1.0
WA6FWI
www.foxsmercantile.com

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