Constant current source (CB8697E)

This circuit was found in a 1968s European documentation. It is a current regulator using complementary general-purpose transistors.

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Sinusoidal Oscillator with the 4093 (CB11858E)
This circuit generates approximately sinusoidal signals from the rectangular signals generated by a 4093...
Digital Timer (CB26205E)
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
Telephone start circuit (CB10154E)
This circuit activates a recorder from the signal obtained from a telephone line in the service. It is...