I can't remember what part it was but voltage out, two other parts are a transistor and a zener for the supply. something ina168 would have worked work with just a resistor
it was used to set bias current on a pulsed RF amplifier, measured on afair 100us pulses
Well, now, if you monitor the low ("ground") side of a supply, you would not care about its voltage. OR, use a current transformer AKA flux gate (or equivalent) and there would be a low concern about supply voltage (slight redesign may be in order for supplies in the KV or so region).
INA260 is my favourite, but 36V max. OTOH, fully digital interface and it can measure current, voltage and power. A self-contained diagnostics chip with a built-in shunt.
Best regards, Piotr
That's not practical in this case. The PCB ground plane is hard bolted to a cold plate, which is frame ground, and the power supply can be shared with other similarly grounded boxes.
Flux gates are a big deal. A resistor and a couple of parts will fit the area and budget.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
If they will do the job. Cheap solutions that don't work well enough can be seductive, but lethal to your reputation.
The first electron beam tester to hit that market sold for about a quarter of a million dollars, but stage positioning mechanism was a cheap Moire fringe device.
The expensive version sold by Heidenhain would have cost about $1000 at the time but there was a cheap system you could buy for about two thirds of the price.
It's downside was that the in-phase and quadrature detectors were physically separate, and could be knocked out of alignment, which needed a service engineer visit to fix.
As soon as somebody else offered a comparable system, sales of the original machine stopped dead. The cheap-skating on the positioning gear wasn't its only bit of corner-cutting, but it was blindingly obvious and would have been easy to fix.
-- Bill Sloman, Sydney
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