Differential microammeter (CB7362E)

This circuit was obtained in a 1964 Electronic Design. The transistors are from the era and the instrument is 100 uA full-scale.

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3-level indicator (CB9815E)
This simple indicator circuit was found in a documentation from the 90s. Trimpots can have values...
Phase Inverter (CB7500E)
This circuit provides two outputs of the same signal. One with the original phase and the other...
Bq35100 Battery Monitor and EOS (COM188E)
January 2017 – The bq35100 integrated circuit, a charge monitor and EOS for non-rechargeable...