[Ham-Mac] Black Cat CW Keyer

[Bill Mahaffey]

On Sunday, September 21, 2003, at 10:34 AM, Chris Smolinski wrote:

>> can clarify this point? If so, perhaps one of us can design a simple
>> circuit that allows the audio feed to drive a logic-level keying
>> circuit. This might be a comparator that drives an inverter so that 
>> when
>> audio is present, the output goes low (to ground)... this could key 
>> the
>> rig, or a relay could be added for rigs that require the isolation.
>
> Here is my thought:
>
> Take the audio output, rectify it, then use that signal to drive an 
> opto-isolator, which can then control the PTT of the rig. If you have 
> an older rig that needs a beefier PTT signal, you could use the opto 
> to drive a relay. I'll try to rig something up when the power comes 
> back on and I can warm up the soldering iron.
>
>

FWIW
In case you already have one, I believe the SignaLink Sl-1+ will take 
audio and key the rig accordingly.

bill W6EET



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