Differential Output Amplifier (CB6135E)

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

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Optical Link Receiver (CB4945E)
This is a possible circuit for the receiver of the previous circuit. Other circuits can be found...
Resistance Multiplier (CB6227E)
This circuit was suggested by Linear Technology in a 1980s documentation. The setting applies to...
Adjustable time chaser (CB6794E)
This circuit was obtained in a 1967 Electronics World. The components are still common today, the...