This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time and the frequency is determined by the crystal. The circuit operates at voltages from 3 to 9 V.
This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of...
This circuit is based on an operational window comparator. We found it in a documentation from the...
This circuit is suggested by Motorola as the basis for the MC3324 A integrated circuit and has a...