Audible Voltmeter (CB21395E)

This circuit was found in an American publication from 1969. Transistors are from the time and can be replaced by modern equivalents.

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Ultrasonic Generator (CB11832E)
This circuit generates an ultrasound whose frequency is set in P1. Reproduction is done on a...
50 ohm line driver 2 (CB6222E)
This circuit was suggested by General Electric / RCA in a 1980s documentation. The components are of...
15 W Class D Stereo Audio Amplifier (CB12952E)
The circuits shown in figure 2 are suggested by Texas Instruments (www.ti.com) make use of the...