Simplistic Mosfet HV Shunt Regs - Page 245 - diyAudio
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Old 2nd January 2012, 05:03 PM   #2441
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OK I will connect again with the old tx
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Old 2nd January 2012, 05:05 PM   #2442
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Quote:
Originally Posted by merlin el mago View Post
voltage across R4 284V
Puresound MM if you want I can remove & connect a dummy load of 15K
voltage across R9 0V
voltage across R5 0V
Yes, you should fix it first with dummy resistor load.

0V across R5 is completely wrong. The shunt mosfet, Q3 isn't working at all. It needs something like 2V-4V across R5 (Vgs) to start working. Take Q2 out and measure with the diode tester between B-C and B-E. One way there should be no reading. The other way you should get a value that is close to each other (B-C and B-E).
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Old 2nd January 2012, 05:23 PM   #2443
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No. You should float two positives from double secondaries and bridges.
Sorry, one more question, would this be good for around 85V DC?
Thanks
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Old 2nd January 2012, 05:27 PM   #2444
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With lower Vref resistors. Make them half.
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Old 2nd January 2012, 05:49 PM   #2445
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Old tx 115 Vout max.
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Old 2nd January 2012, 06:00 PM   #2446
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Roughly, this is how the circuit should measure if it worked correctly.
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Old 2nd January 2012, 06:04 PM   #2447
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Originally Posted by ikoflexer View Post
Yes, you should fix it first with dummy resistor load.

0V across R5 is completely wrong. The shunt mosfet, Q3 isn't working at all. It needs something like 2V-4V across R5 (Vgs) to start working. Take Q2 out and measure with the diode tester between B-C and B-E. One way there should be no reading. The other way you should get a value that is close to each other (B-C and B-E).
MJE350 B-C & B-E close reading.
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Old 2nd January 2012, 06:07 PM   #2448
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Originally Posted by ikoflexer View Post
Roughly, this is how the circuit should measure if it worked correctly.
Vin?
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Old 2nd January 2012, 06:13 PM   #2449
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Originally Posted by merlin el mago View Post
Old tx 115 Vout max.
How you had 260VDC out on 15k dummy yesterday? That was 17mA on the load only.
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Old 2nd January 2012, 06:16 PM   #2450
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Olx tx 115Vout is measured with Puresound MM instead the dummy load, it's the only change.
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