This circuit is better than the previous one in that the control is isolated by a transformer. The transformer has 110 or 220 V primary and 6.3 to 12 V secondary with 200 to 500 mA current.
This step of good gain was obtained in an American publication of the 1980s. The circuit can be...
This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine....
We found this circuit in an Australian documentation from 1991. The circuit is suitable for SMD...