[Amps] Measuring filament voltage

[jeff millar]

Suggest adding a bluetooth link from filament to control panel to further
the scheme.

jeff, wa1hco

On Wed, Jun 22, 2022 at 10:59 AM Radio WC6W via Amps <amps at contesting.com>
wrote:

>
> Ooops, somehow, I lost the last two "OR's" when copying this scheme into
> email.  Yahoo has a mind of its own at times.
>
> Here's the whole idea(s):
>
> If you want to measure the voltage at the filament on those follower
> triodes may I suggest the following scheme:
>
> Use an AD536 to convert to RMS right at the tube.
>
> Use a LM331 to convert the voltage to frequency.
>
> Send the frequency out over an optical fiber and read it with a frequency
> counter or alternately convert it back to voltage with a F-V converter.
>
> Power it with a tiny hi voltage isolation transformer. Only requires
> milliamps to run.
>
> Or use a power over fiber cable scheme, though those are rather pricey.
>
> Or rectify and regulate the filament voltage to power the interface.
>
> Or eschew the RMS chip, add an absolute value circuit in front of the V-F
> converter, and then process the resulting signal down fiber.  A small
> microprocessor should be sufficient in lieu of that pricey RMS part.  There
> might be a touch of error down at the lowest transmitted frequency, though
> it should be less than .1%.
>
> Just the complete thought,
> Marv WC6W
>
>
>
>
>
> *
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