Differential Output Amplifier (CB6135E)

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

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1 kHz Active Band Pass Filter RC4558 (CB19782E)
This circuit uses two Raytheon RC4558 operational amplifiers that are similar to the 741. The...
Complementary Amplifiers up to 40 W (CB12354E)
This audio amplifier circuit is from Ibrape's technical documentation from the 70's. The BC177 can be...
Progressive relay switch (CB23775E)
This progressive circuit has a lock allowing coded activation. We found this configuration in...