Metal Detector (CB21929E)

This two-transistor metal finder was found in a Raytheon manual from the 1950s. The transistors are germanium from the time.

200 MHz Amplifier (CB16666E)
This circuit is from a specialized documentation in 1992 FETs. The L1 coil has 0.07 uH with...
Symmetric 50 mA Regulator MC1568L (CB15327E)
The LM1468L can also be used. The circuit is from Motorola's Linear Interface ICs and the...
Frequency Doubler (CB4868E)
This low frequency doubler requires a 50 mV signal at the input. The circuit is from an old...