Found in American documentation from the 90's, this circuit is very current and can be implemented with transistors of general use. Never use a power supply without a transformer.
We found this circuit in the ON Semiconductor Thyristor Manual although similar configuration can be found...
We found this circuit in the June 1991 issue of Radio Electronics magazine. The integrated circuit is...
The integrated circuit used in this filter is not very common today, but the reader can use...