Binary Counter using lamps (CB6606E)

This is a transistor flip-flop suggested by General Electric in a 1966 paper. The transistors are of the time and can be used equivalents.

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Divider with the 4046 IC (CB25003E)
The purpose of this PLL circuit that we found in the November 1986 Radio Electronics magazine is...
Ambiguity Circuit (CB21513E)
This circuit is intended for detecting 3 levels power grid voltage, and it can be adapted to...
LM380 Gain 200 Amplifier (CB14171E)
This circuit, which provides a power of up to 3.5 W, can be supplied with voltages from 9 to 14 V....