Fans of vintage circuitry should checkout this video. Sadly Thomas Scherrer isn’t able to bring the Avo DA14 digital multimeter back to life. Insightful teardown that is delightful to watch.
Another AVO i think it is a cool brand so i sort of look for this brand and ask my friends to do the same 🙂 I also really like NIXIE tubes, so this had the be cool, This only made me more sad, I am not able to fix this one the way it should be, main ADC multiplexing IC is called MC902 and i find no information about it anywhere, I am sure the multiplexing is stopped and blocked, most likely this ic is defective. I see 50.0Hz sine wave oscillator and 400Khz osc running, Opamp SN72748P, other IC i can not look up SN7274N, and SN72021
See the Avo DA14 digital multimeter at the Radio Museum and a few more details about the project from Hackaday
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