100 MHz harmonic oscillator (CB9659E)

This Pierce oscillator was found in American documentation from the 1980s. Transistors support modern equivalents.

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5V x 500 mA Buck Converter (CB9952E)
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...
Temperature control (CB10168E)
This circuit makes use of a constant current source to control the temperature of a direct current...
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This circuit provides a few watts of output and can be used in the car as an auxiliary amplifier....