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.
We found this circuit in a publication with experiments with operational amplifiers from 1973. The...
This TTL digital circuit from Texas Instruments documentation from the 1970s used the company's SN types...
This circuit uses an audio output transformer found in old transistor radios. Power output is...