The filter presented is from 1994 but can be implemented with a more modern equivalent. We found this setting in the National Semiconductor Linear Applications Handbook.
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...