(21-04-2013, 02:24 PM)AlanBeckett Wrote: I upped the capacitor across the Transformer Primary to 10n: it oscillates, at about 300kHz . . .
Alan
300 kHz? Really?
By my arithmetic, that makes the total effective inductance 28 µH: seems far too small. Now add in all the 'invisible capacitance' associated with the physical manifestation of that design: makes the inductance even lower.Sure that is wasn't 30 kHz? Sure that that '10 nF' was really 10 nF?
The 'old cct.' that specifies 20 kHz: with a 2 nF capacitor, that gives L = 28 mH; 28 mH and 10 nF gives 10 kHz.
Something's not right there . . . . or am I missing something obvious? (Not unusual
)Al. / April 21 //
