This oscillator for the fifth overtone of a crystal was found in a Radio Electronics magazine from May 1970. Transistors are RF types, and the transistor determines the maximum frequency achieved.
This traditional configuration of bandpass or bandpass filter with operational 741 was found in a...
This circuit was found in the March 1980 issue of Radio Electronics magazine. It is based on the...
We found this circuit in an old manual. The bypass range is 20 MHz and the power supply must be...