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Old 2nd December 2012, 06:58 PM   #361
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Old 2nd December 2012, 07:03 PM   #362
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by beetle View Post
Scope draws a flat line at the output.

Shunt neg: -0.558V
Shunt pos: +0.544V

Pre Reg neg: 23.24V
Pre Reg Pos: 23.9V
I'm not sure where you did measure these, can give your voltages as indicated in the attached PDF? The total wattage from the raw-PSU is being disipated in the regulator (about 120mA @ 24V = 30 Watt (more or less)), if the RIAA is not connected it will get very hot. Check the voltage across the two 10 Ohm (R140/204) resistors, it should be 1.2V.
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File Type: pdf Paradise R3 schematic regulator annotated.pdf (17.5 KB, 54 views)

Last edited by FdW; 2nd December 2012 at 07:08 PM.
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Old 2nd December 2012, 07:30 PM   #363
beetle is offline beetle  Germany
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TP101: 20.048V
TP102: 18.026V
TP103: 24.081V
TP104: 541mV
Vin(pos): 31V@215mA

TP201: -19.498V
TP202: -18.030V
TP203: -23.540V
TP204: -552mV
Vin(neg): -31V@154mA
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Old 2nd December 2012, 08:05 PM   #364
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It's a bit of an ugly picture on my 60MHz scope but it's definitely oscillation at and above 100MHz. Will try to add ceramic caps.
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Old 2nd December 2012, 08:28 PM   #365
pdul is offline pdul  Denmark
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[QUOTE]It's a bit of an ugly picture on my 60MHz scope but it's definitely oscillation at and above 100MHz. Will try to add ceramic caps. [/QUOTE)
So we have succesfully build a paradise rf transmitter
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Old 2nd December 2012, 08:30 PM   #366
pdul is offline pdul  Denmark
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Maybe we can use it wireless, and recieve the music on a FM radio
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Old 2nd December 2012, 08:57 PM   #367
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by beetle View Post
TP101: 20.048V
TP102: 18.026V
TP103: 24.081V
TP104: 541mV
Vin(pos): 31V@215mA

TP201: -19.498V
TP202: -18.030V
TP203: -23.540V
TP204: -552mV
Vin(neg): -31V@154mA
The PSU seems almost o.k. There is one thing, the difference between TP102 and TP103 is a bit big, setting the current for the positive regulator a bit high (215mA). Best thing is to replace LED110 and Q102, one of those seems to be the problem.
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Old 2nd December 2012, 09:37 PM   #368
beetle is offline beetle  Germany
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Quote:
Originally Posted by FdW View Post
The PSU seems almost o.k. There is one thing, the difference between TP102 and TP103 is a bit big, setting the current for the positive regulator a bit high (215mA). Best thing is to replace LED110 and Q102, one of those seems to be the problem.
I did so. But no change.
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Old 2nd December 2012, 09:48 PM   #369
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by beetle View Post
I did so. But no change.
Check the voltage across LED110 and R102 (also check the value of R102). The only other suspects are Q101/R103 but we know that the CCS is working otherwise the mosfet would burn-out or the raw-voltage would collapse. If you have a spare for Q101 the swap it (but that would be a strange failure mode).

Last edited by FdW; 2nd December 2012 at 09:53 PM.
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Old 2nd December 2012, 09:52 PM   #370
beetle is offline beetle  Germany
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Uled=1.918V
Ur102=3.448V
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