The LM393 voltage comparator is built with all discrete components and uses an open-drain output. The two sets of comparators share a current source.
After actual side view, when the tubes are paired manually, the input offset voltage can be controlled below 3mW.
The appearance adopts a design method that imitates electrical symbols. The pins are compatible with the general LM393. There is an introduction to the relevant parameters on the back of the board.
The 2SK170 used is 2SK170-Y. If using BL, please modify the source resistor.
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