Direction Signal (CB25608E)

This circuit was found in the September 1993 Electronics Now magazine. It is based on the 555 and powers an audible indicator.

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Ultrasonic Transmitter (CB14459E)
We found this ultrasonic emitter in a 1964 publication. The transducer is a piezoelectric type....
Transducer Amplifier (CB4939E)
This 80's circuit has an input resistance of the order of 880 M and gain 10, using operational...
4 W Complementary Amplifier (CB6173E)
This circuit was found in 1968 General Electric documentation. The circuit uses components from the era...