Don't forget that Ge "crystal" diodes are also suitable (and even better than most schottky's) and could be easier to salvage from old equipments.
They include many two-digits 1N types, like 1N34, 1N70, european types, OA90 to 95, AA119, 143, etc, plus japanese 1Sxx, soviet types, etc
They include many two-digits 1N types, like 1N34, 1N70, european types, OA90 to 95, AA119, 143, etc, plus japanese 1Sxx, soviet types, etc
"ALL" VU meters are 200uA. Unless they are very cheap 1mA units with a custom driver.
Needle-type VOMs come in $10 500uA and $50 50uA basic movement.
This one is 50uA for $33, and you don't even have to open it up.
https://www.amazon.com/Tekpower-TP7244L-7-Function-Multimeter-Protective/dp/B00MI6T0IW
(Oddly, it says 60uA on the switch?)
Another key clue is the fine print on the scale: "2K/V" is 500uA, "20K/V" is 50uA. If they don't actually expose a 50uA range on the switch, you can bust it open and connect direct to the movement.
This appears to also be a 50uA meter:
https://www.amazon.com/Tekpower-TP8250-Multimeter-Variation-Measurement/dp/B00SLVPJSI
Needle-type VOMs come in $10 500uA and $50 50uA basic movement.
This one is 50uA for $33, and you don't even have to open it up.
https://www.amazon.com/Tekpower-TP7244L-7-Function-Multimeter-Protective/dp/B00MI6T0IW
(Oddly, it says 60uA on the switch?)
Another key clue is the fine print on the scale: "2K/V" is 500uA, "20K/V" is 50uA. If they don't actually expose a 50uA range on the switch, you can bust it open and connect direct to the movement.
This appears to also be a 50uA meter:
https://www.amazon.com/Tekpower-TP8250-Multimeter-Variation-Measurement/dp/B00SLVPJSI
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