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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Locked Output Detector (CB4814E)
We found this circuit in a Popular Electronics of the 90s. Its purpose is to detect when it locks...
Power Flasher 2 (CB12995E)
In the circuit shown in the figure, we add a capacitor (C2) and a resistor (R4) at the base of the...
500 kHz to 500 MHz Amplifier (CB13388E)
This circuit, from a 1975 technical documentation provides a gain of 14 dB at signals from 500 kHz to...