This circuit is from a 1976 amateur radio manual. The transistor can be the BD136 and the frequency adjustment is done in a potentiometer. The supply can be done with voltages from 6 to 15 V.
This circuit is in the SGS manual of linear integrated circuits of 1982. The integrated circuit is of...
This circuit sends its signals to short wave receivers and even FM outside stations placed nearby. As...
This simple VU (Volume Units) or volume indicator for amplifiers was obtained in an English...