Found in a 1967 EEE, this circuit oscillates at 20 MHz according to the values of the given components. The FET can be of general use. The coil has only indicated the number of turns.
This amplifier circuit applies its signal to an ordinary audio amplifier to pick up signals from a...
This circuit regulates the output voltage of a 78xx according to the light incident on the sensor....
We found this circuit in an 80's schematic. The circuit uses LEDs in series with zeners to...