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Old 15th December 2012, 05:08 PM   #2041
Salas is offline Salas  Greece
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What kind of caps are installed on rails at load side? Since its oscillations with the load, maybe more R value in R7 for damping, or 0.1R in series with the load to buffer it.
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Old 15th December 2012, 06:40 PM   #2042
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The oscillations occur with or without the load. I am using just a resistor to simulate the load. My actual circuit that will be the load is currently being built.
The variable seems to be the amount of current through the shunt transistor.
I do not think that buffering the load will help but I will alter the value of R7 and see how that works.
It may be that I need to use all positive regulators to run the amount of current that I want to. That will be a lot more work to do because my heatsink will need to be drilled and tapped for the positive circuit board.
Thanks for your help.
Bill
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Old 15th December 2012, 06:45 PM   #2043
Salas is offline Salas  Greece
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You talked about varying load and I thought something real. But you did not mean dynamically so. Just changing consumption. Got it. How is it at 200mA spare?
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Old 15th December 2012, 08:31 PM   #2044
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Sorry for any confusion. At 200 mA via the shunt transistor it oscillates. I have been checking out my positive regulator with the oscilloscope and it is rock stable at any load.
At this point, I plan to build more positive regulators and use them for the negative power supply. Do you think that there is a problem with that? My transformers and diodes are all separate for the positive and negative side.
Bill
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Old 15th December 2012, 08:49 PM   #2045
Salas is offline Salas  Greece
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I don't think its that different to the positive. I will have a closer look with the currents you refer and let you know more.
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Old 15th December 2012, 08:50 PM   #2046
Salas is offline Salas  Greece
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P.S. Are your builds p2p or on PCBs?
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Old 15th December 2012, 08:57 PM   #2047
Billc is offline Billc
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I am using the circuit boards from tea bag.
One of the FET's has g shorted to d instead of s.
Changing that did not make a difference.
Bill
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Old 15th December 2012, 09:20 PM   #2048
Salas is offline Salas  Greece
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Try 100 Ohm gate stoppers on the 610s.
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Old 17th December 2012, 12:54 PM   #2049
Salas is offline Salas  Greece
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Quote:
Originally Posted by samoloko View Post
I am looking to buy some films for Vref and Vout
I am struggling between Auricap and Sonicap
would you recommend which can be better to power line aplication - UGS V3
of course you can recommend some other brand
I would like to use Obbligato Gold but It Is so long
There was a builder reporting very favorably for Sonicap there.
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Old 18th December 2012, 07:37 PM   #2050
RCruz is offline RCruz  Switzerland
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+1 for sonicaps
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