4W Amplifier (CB6205E)

This high gain circuit is from 1969 General Electric documentation. The transistors are of the time, but equivalent types can be tested.

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Analog Multiplier (CB7930E)
Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to...
1 W LM386 Amplifier (CB17022E)
This circuit has appeared several times on this site in different applications. This is from 1997...
Compator with hysteresis (CB5079E)
This setting appears other times in this section from other sources. This is from an 80's American...