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 found in the October 1987 Radio Electronics magazine. The triac must be matched to...
Found in a 1980s American documentation, this circuit can use a SCR and a general-purpose transistor....
The circuit shown is from National Semiconductor's Linear Applications Handbook. The LM3900 is a...