27 MHz Oscillator (CB24983E)

This tunnel diode oscillator was found in July 1986, Radio Electronics magazine. Note the low supply voltage.

FM receiver with BC548 transistor at output (CB23552E)
The receiver shown above was sent in by contributing reader Adriano Muniz Moura and is used for...
High-Side Current Amplifier (CB12943E)
Current sensors of the type High-Side (high side) are circuits that monitor the current drained by a...
Solar Charger Controller (CB26028E)
We found this circuit in the October 1997 Electronics Now magazine. The circuit controls a solar...