Found in a Popular Electronics from the 90s, this circuit is intended to measure the harmonic distortion of an audio signal. The circuit can be tuned between 970 and 1030 Hz.
This logic probe was found in a Popular Electronics from the 90s. The circuit is TTL and must be...
The integrated circuit used in this configuration is not common today. The zener determines the...
The original frequency of the Pierce Oscillator with bipolar transistor is given by the crystal, which...