Quote:
Originally Posted by kalee20
That looks highly credible! (though 804mΩ for secondary resistance seems a bit high for a 40VA transformer... if you've measured one though, I'll take that back!)
Can you also show the capacitor voltage?
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The mean voltage across the capacitor is 15.95 VDC as shown in the table in the screen shot in this and my previous post, enclosed is a screen shot of the voltage waveform across the capacitor, the ripple factor is approx. 6.5% according to my calcs.
Rightly or wrongly here's what I did, I inputted the OP's transformer off load voltage (17.5 VAC) its nominal voltage (15 VAC) an IAC of 0.666 Amps (10VA/15 VAC) and a regulation figure of approx. 14.28%, that spewed out a DCR figure of 3.216 Ohms, I divided that by 4 to get 0.804 Ohms, I multiplied the current of 0.666 Amps by 4 which gave 2.664 Amps.
Lawrence.