D-104 Mike Info

[Radman]

Murray et al,

Good call on the relay! The other "caution" is to
seriously consider proper *grounding* of that metal D-104
mike stand. A buddy of mine suffered a shocking experience
when a similar D-104 switching scheme went south and his
mouth was within striking distance of the mic. Seriously,
120VDC at 300mA can be quite fatal. My friend was lucky
and survived it. He sold the D-104 and bought a Vibroplex
and never went back to the mic. Please use care, Keith :-)

73 - Conrad - NN6CW

************************

Yow! I hope someone confirms my gut reaction that that is
the kind of power
you use a relay with big coin silver contacts to switch.
maybe I'm wrong,
but I think the mike switch would weld. I think most
keying circuits are
very low current. I would use an external relay or MOSFET
switch,
personally.

Murray

************************

>Help!  Does anyone out there know how much voltage and
current the PTT
>switch in the older D-104 mikes will switch without
self-destructing?
>Will it do negative 120 VDC at about 300 ma.???
>
>Thanks,
>
>Keith

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