Found in a publication by Gernsback from 1960, this circuit uses germanium transistors of the time and commercial coils. It can be changed to operate with modern transistors and other wavebands.
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...