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.
Simple timers can be designed using inverters or any other gate that can be connected as inverter. Figure...
The arranjment sohon Bellow, and simulated in the Multisim Blue allows to see in the oscloscope...
We found this circuit in the 1990 Motorola Linear Databook. The circuit must use symmetric source and has...