Crystal Pierce Oscillator (CB6149E)

This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.

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Bridge Capacimeter (CB887E)
This circuit consists in a capacitor bridge for capacitance measurements. The circuit can be...
Programming the Duty Cycle (CIR101E)
The previous oscillators that use gatesshown in this section, and the 4093 in the basic version,...
Germanium Transistor Voltage Regulator (CB987E)
This circuit, found in an old magazine of the year 1968, uses a Power germanium transistor. This...