Ok .. i feel silly now .. i found the problem ... found a diode not in the
schematic next to a opamp that was/is supposed to be for external metering that
was shorted to ground. (no i was still using the internal) -- replaced and my
GS-35b is running 200ma with a 31V bias .. id say that's about right wouldnt
you??
Mike
KC7NOA
> Date: Mon, 1 Mar 2010 10:47:14 -0500
> From:
> CC: amps@contesting.com
> Subject: Re: [Amps] Manganin wire
>
> Hello All,
> Forgive me if this has already been said.
>
> The resistance of manganin wire is extremely stable with respect to
> temperature and this is why it is so useful as a meter shunt. An
> ammeter is nothing more than a voltmeter that measures the voltage drop
> across a meter shunt. The resistance of the shunt and the meter scale
> determine the range of the ammeter. There is no reason to use manganin
> wire to connect the power supply to the meter unless the designer is
> using this connection AS the meter shunt. Just because the meter scale
> reads amps, doesn't mean that there is a shunt internal to the meter.
> Good luck & 73, Tim, W2UI
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