Zen circuit theory
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 21st June 2001, 04:05 AM #1 ding diyAudio Member   Join Date: Apr 2001 Location: Brisbane Australia Ok I give up. Who can tell me how a 10W output figure is calculated for the zen amp. With a Vds of 17V and Ids of 2A why doesn't the Pout = VI = 34W. Has this got something to do with the DC filtering Capacitors C3 & C4 or maybe resistor R2 for bleeding DC to ground. Can someone please clear this up for me. Cheers Dan
 21st June 2001, 09:18 AM #2 Keithj diyAudio Member   Join Date: May 2001 Location: New Zealand Try... Power in a load = V^2/R Where V is the RMS output voltage and R is the load impedance. (I know, I know, this says noting at all about phase angels and other A.C things) but it is indicative. regards.
 22nd June 2001, 03:11 AM #3 ding diyAudio Member   Join Date: Apr 2001 Location: Brisbane Australia This may be it Correct me if I'm wrong. The voltage Vds = 17V is the Vpp of a sine wave output. To convert this to Vrms = 17/(2*sqrt(2)) = 6V. RMS power should be Prms = VrmsIds = 6*2 = 12Wrms. If this method is correct why do I get 12Wrms output and not 10Wrms as described. If I am way out can someone please set me straight. Cheers Dan
 22nd June 2001, 03:44 AM #4 GRollins   diyAudio Member   Join Date: Feb 2001 Location: Columbia, SC Dan, Subtract the 4-5V to the gate (the bias voltage) from the available voltage. 17V-4V= 13V (available [peak] voltage swing) 13V*.707= 9.19V (RMS voltage) 9.19V/8ohms= 1.15A (current through 8 ohm load) 9.19V*1.15A= 10.6W (close enough for government work) Grey
 22nd June 2001, 03:48 AM #5 ding diyAudio Member   Join Date: Apr 2001 Location: Brisbane Australia Just the ticket Thanks Grey

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