The signals from this circuit obtained from the 1965 Radio Shack documentation are picked up from a medium wave receiver. L1 and L2 have 80 to 100 turns of yarn 28 on a ferrite rod.
In the figure we have the way to use a single control voltage to act on two varicaps...
This oscillator provides a 1 MHz rectangular signal determined by the capacitors used. The circuit...
This shield circuit with an optical coupler was found in an 90s EDN. The circuit can be used with...