15W Amplifier (CB6284E)

This circuit was suggested by Texas Instruments in a 1968 publication. The transistors are of the time, and modern equivalents can be used.

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Debouncer (CB9277E)
This circuit was found in a 1967 American documentation. The switching diode (tunnel) used is an...
741 Preamplifier with Balanced Output (CB13673E)
This circuit was found in a 1975 documentation. Operational amplifiers must have a symmetrical source and...
Tunable Fourth Order Filter with the 741 (CB13710E)
The diagram shown was found in a 1975 active filter manual. The tuned frequency range depends on...