I Have a copy of the 670 instructions. The plug with the red marker goes
to +12 V dc and the unmarked plug is the keying line. If you look on the
board, the 12 volts goes to two 180 ohm resistors in parallel.
Enjoy the keyer.
73,
Bob WB2VUF
D. Kemp wrote:
> Would someone tell me which lead on this keyer is the
> 12vdc. One lead has a red maek on it and the other
> does not. The pc board is not marked either. I cannot
> find a manual online unless I buy one.
>
> Thanks,
>
> Don
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