Voltage probe (CB8184E)

Found in a 90s Popular Electronics, this circuit uses general-purpose transistors, serving to indicate the polarity of circuits.

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Accented Metronome (CB5336E)
This circuit was found in an ancient American documentation. The transformer is the type used in...
Digital mixer (CB8757E)
Found in a 90s Electronic Design, this circuit employs CMOS functions to mix signals from two...
Bq35100 Battery Monitor and EOS (COM188E)
January 2017 – The bq35100 integrated circuit, a charge monitor and EOS for non-rechargeable...