Operating in the range of 3 to 100 MHz, this circuit was found in documentation from the 70s. Observe the coil. The field effect transistor is a component of the era.
This oscillator takes advantage of the 2000 ohms headphone inductance as the oscillator circuit coil....
This circuit was found in an 80's Electronic Engineering. The circuit uses a multivibrator with...
Found in a 90s Radio Electronics, this circuit is intended to trigger a relay when the current in...