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Old 13th November 2012, 05:28 PM   #1
rrae is offline rrae  Norway
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Default dls cad 11

I cannot get +/- 15v regulated voltage output of regulators. I took a brand new 7915 and 7815 regulators, i get only 13.66V on their inputs. Supply voltage on terminals is 13.88V. The rails are +/- 33.3V. Amp ground terminal as reference. It powers up "fine", no protection. If someone don't have schematic, i can send.
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Last edited by rrae; 14th November 2012 at 06:03 AM.
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Old 14th November 2012, 12:20 AM   #2
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If no one can help, post a photo of the board.
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Old 14th November 2012, 06:04 AM   #3
rrae is offline rrae  Norway
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Right now i can only show the pictures from this topic - dls cad 11
Later i can send better quality pictures.
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Old 14th November 2012, 07:11 AM   #4
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Those are good enough for now. I don't have the exact diagram but I have something close that may be of some help. Email me and I'll send it to you.

babin_perry@yahoo.com
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Old 14th November 2012, 07:20 AM   #5
rrae is offline rrae  Norway
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I have mad11 diagram which is almost the same, only difference that "mad" was made for russian market. If You Perry don't have it, i can send it to you.
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Old 14th November 2012, 07:22 AM   #6
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Sure, send it.
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Old 14th November 2012, 07:26 AM   #7
rrae is offline rrae  Norway
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Check your inbox.
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Old 14th November 2012, 07:33 AM   #8
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The rail voltage is much too low. Are the power supply FETs intact?

Are they being driven properly?

If you don't have a scope, check the drive with a multimeter set to DC volts. You should read approximately 5v with the black probe on leg 3 and the red probe on leg 1. Check the FETs for both power supplies.
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Old 14th November 2012, 04:16 PM   #9
rrae is offline rrae  Norway
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I did not find any shorts at power supply fets.
They are not driven properly, drive voltage for all fets was 1.38-1,43V.
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Old 14th November 2012, 04:26 PM   #10
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Post the DC voltage on all pins of the SG3525.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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