28-10-2013, 10:47 PM
(28-10-2013, 10:07 PM)Yorkie Wrote: Incidentally, though I used two back to back transformers for the HT, there's no reason why a small mains transformer from a scrap radio can't be used. The 6.3V heater winding (rectified) could provide the power for the digital meter, most types of which must not share the same ground as the rest of the circuitry.
Another source for isolated HT would be transformer from a shaver socket. The other, direct-mains, design could also be fed from one.
- Joe
