AVO_MK3_fixing

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svante
Posts: 13
Joined: Wed Feb 24, 2021 6:17 pm
Location: Sweden

AVO_MK3_fixing

Post by svante »

Hi
Had plan to build a record player as next project, but then I ran in to this nice AVO meter to 1/3 of the normal price, so some fixing of that will be the next task instead. Changing the Capacitor's (not many), checking / adjusting resistors, I know some people say you should change them al, but i only cange the one out of spec. Cleaning the switches of cours (drip method, not spray, am a bit worried about the wafers stability)
AVO.jpg
AVO.jpg (54.48 KiB) Viewed 807 times
The meter had lost some gain (full swing shuld be at 30 myA, have the meter on 30,2 sinze non conected shows 0,2 my
AVO_meter_week.jpg
AVO_meter_week.jpg (56.19 KiB) Viewed 807 times
After som exprementing, ading 2 ectra neodym magnets 10*3 mm , the meter is spot on at full gain, and th 22,2 and 27 myA setpoints is also spot-on.
AVO_meter_adjusted.jpg
AVO_meter_adjusted.jpg (49.96 KiB) Viewed 807 times
Next step is to calibrate the voltage, maybe next weekend.

Br Svante Lejon
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