This proximity relay circuit was found in the July 1990 Radio Electronics magazine. The supply voltage should be according to the relay used.
This circuit is from Signetics' 80s documentation. The circuit generates 100 kHz signals according...
The small transmitter shown in the figure can generate signals in the range of 50 MHz to 200 MHz....
This oscillator produces a modulated signal using a unijunction transistor. We found it in an...