Differential Output Amplifier (CB6135E)

This circuit of old American documentation (1965) can be applied to any transistor.

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Voltage Controlled Current Regulator I (CB19943E)
This circuit was found in documentation from the 1980s. The transistor depends on the desired...
Multiple Alarm (CB20628E)
We found this circuit in a 1985 technical publication. The circuit uses PUTs to drive lamps....
Zero crossing detector (CB20624E)
This type of circuit, found in American documentation from the 1980s, triggers producing output...