Metal locator (CB7506E)

This simple metal detector was found in a 1960 Sylvania transistor manual. The phone must be high impedance or crystal.

High voltage probe (CB19747E)
This is a high voltage probe that allows the measurement of high continuous voltages with a common...
15 W Class D Stereo Audio Amplifier (CB12538E)
The circuit shown in figure is suggested by Texas Instruments (www.ti.com) and makes use of the...
Fuzz Distortion Pedal (CB11247E)
This well-known configuration of the guitar effects pedal was obtained in an English magazine from...