Visual metronome (CB21062E)

Based on the well-known LM3909, this LED pulser circuit was found in American documentation from the 90's. The power supply is only 1.5 V.

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Phonographic oscillator (CB8247E)
This circuit was found in a Modern Transistor Workbook from 1965. The circuit sends signals from a...
Ground-Referenced Constant Current power Supply (CB25616E)
Unlike the previous circuit, this circuit from Electronics Now, October 1993, has the load...
Electrometer (CB18625E)
This circuit can detect static charges or extremely low voltages. The circuit was found in ancient...