Keithley 164 Nixie Tube Multimeter Repair

Описание к видео Keithley 164 Nixie Tube Multimeter Repair

Microscope: http://bit.ly/2ONJB38
Patreon :)   / marcoreps  

We have briefly looked at this ancient DMM before, but delayed the repair for a while. Now the time is right! We are diagnosing a problem with the Nixie supply voltage and replicate 2 unobtainium ICs with modern components. The 960 driver aka Fairchild 996079 aka 9960 is a Nixie tube driver, that interfaces with 3.6V logic and takes an inverted BCD input. I'll imitate its behavior with a 74HC42 BCD decoder and discrete MOSFETs.

Equally the MC867P is replaced by a 74HC75 and a few pull-up resistors.

What now? I don't even need it as a DMM?

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