We found this circuit in a 1977 Radio Shack brochure. Transistors can be the most modern BC548 for NPN and BC558 for PNP. The potentiometer can be 47k or even 100k and the speaker 8 ohms. The circuit also works with 6 V.
Sound Metronome (CB13509E)
- Details
- Written by: Newton C. Braga
