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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Timed Code Switch Alarm (CB18003E)
Disabling this circuit from a 2002 documentation can only be done by pressing 4 keys in a correct...
JFET Timer (CB12123E)
This circuit was found in a 1979 magazine. We can use any JFET like MPF102 or BF245. The relay is 12 V...
Gain 1000 Amplifier (CB8998E)
This circuit was obtained in a 90’s documentation. The operational amplifiers are from that time....