This traditional circuit generates a 200 Hz sinusoidal signal. The frequency depends on the capacitors and the transistor can be a BC548. We found this circuit in a 1979 documentation.
This circuit was obtained in a 1994 documentation. The assembly is very critical, and the circuit...
This interesting electronic Christmas tree circuit using LEDs and integrated CMOS was found in a...
High quality sound can be obtained from this transistor amplifier. The output transistors must be...