This variable frequency (VFO) oscillator was found in a Japanese publication of 1962. Coil details (in Japanese, but can be deduced) are next to the diagram covering the 3.5 MHz band.
The great advantage of the circuit shown in the figure is that its frequency is controlled by a...
This 80's Motorola circuit can generate 100 MHz signals, but they can reach 200 MHz with the...
This circuit, found in a 1978 publication, converts 5 V into a symmetrical 15 V output under low...