Pearl Two - Page 101

Marra · 6th November 2011, 05:08 PM

Quote:

Originally Posted by richluvsound

Also available from these guys for a couple of quid less.They seem to be tied in with Farnell so don't get the price difference. Farnell are good and quick though having been woken up at 7.30 in the morning by there delivery people even when some items have had to come from one of there european sites.

MULTICOMP|MCFE050/25|TRANSFORMER ENCAPS. 50VA 2X25V | CPC

jacco vermeulen · 6th November 2011, 06:40 PM

Mr Cheapo : DAGNALL ELECTRONICS|D3620.|TRANSFORMER, 6VA 2X 24V | Farnell United Kingdom

richluvsound · 6th November 2011, 07:42 PM

that should look wonderful with silver wire surrounded by mundorf M-lytic caps ......

I think I'll just leave this thread for the chosen ones.... sorry for wasting your time !

richluvsound · 9th November 2011, 11:46 PM

Gents ,

So , now I need some of the genius lurking . I have a problem with one of the boards . I keep blowing fuses .

Voltage from PSU is solid and stable @ 40.2 VDC on both + & - . There was
little smell when I first turned it on . The LED dimmed never to return .
The fuse is 250mA . I have had the working board running for about 3 hours with no problems . I have taken photos , visual inspection proved sound . Solder joints are solid with no shorts .
Short of dismantling the board are there any suggestions on how I may find the fault . ?

thank you , Rich

richluvsound · 10th November 2011, 02:29 AM

Ok ..... it would help if I didn't have the + and - the wrong way round . At least that explains the 8 fuses in the bin !

Now I have nothing , but distortion and the occasional pop .... Test speakers at low volume . Its the same out of both channels ....

????? any ideas guys ?

Cheers , Rich

nar · 04:08 AM

At least, you should change the on-board regulators and the led for new ones

If no improvement, go on with the bipolars replacement ... at least I hope the precious jfet are still alive, but maybe not.

You could also have fried some resistors. Your mileage may vary.

Best,

nAr

Marra · 10th November 2011, 04:07 AM

Rich build yourself a light bulb tester if you havent already done so it saves a fortune in blown fuses and generally stops anything from cooking. Won't tell you where the problem is but lets you know there is a problem before damage is done.

nar · 10th November 2011, 04:12 AM

Quote:

Originally Posted by Marra

Won't tell you where the problem is but lets you know there is a problem before damage is done.

Yes, but in his case it's better to know where the problem is

Bulb would be for another time ... good idea

richluvsound · 10th November 2011, 09:51 AM

Thanks Gents ,

I'll change the regs out to start with ... !

cheers, Rich

richluvsound · 10th November 2011, 01:44 PM

Do I need to change regs on both boards or just the one blowing the fuse ... ?

I changed the ones on the bad board and no change - still got the same distortion .... I have just ordered new caps 22uf and 3300uf ... I'll call pass this afternoon and order new j fets.

Rich

6th November 2011, 06:40 PM	#1002
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Mr Cheapo : DAGNALL ELECTRONICS\|D3620.\|TRANSFORMER, 6VA 2X 24V \| Farnell United Kingdom __________________ Looks like Sponge Bob has killed another thread.

9th November 2011, 11:46 PM	#1004
richluvsound diyAudio Member Join Date: Sep 2010 Location: LONDON	Pearl Problem ? Gents , So , now I need some of the genius lurking . I have a problem with one of the boards . I keep blowing fuses . Voltage from PSU is solid and stable @ 40.2 VDC on both + & - . There was little smell when I first turned it on . The LED dimmed never to return . The fuse is 250mA . I have had the working board running for about 3 hours with no problems . I have taken photos , visual inspection proved sound . Solder joints are solid with no shorts . Short of dismantling the board are there any suggestions on how I may find the fault . ? thank you , Rich

10th November 2011, 04:05 AM	#1006
nar diyAudio Member Join Date: Apr 2002 Location: near the sea	At least, you should change the on-board regulators and the led for new ones If no improvement, go on with the bipolars replacement ... at least I hope the precious jfet are still alive, but maybe not. You could also have fried some resistors. Your mileage may vary. Best, nAr __________________ "... Audio needs the thinnest wire ..." Rowan McCombe "Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright Last edited by nar; 10th November 2011 at 04:08 AM.

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6th November 2011, 07:42 PM	#1003
richluvsound diyAudio Member Join Date: Sep 2010 Location: LONDON	that should look wonderful with silver wire surrounded by mundorf M-lytic caps ...... I think I'll just leave this thread for the chosen ones.... sorry for wasting your time !

10th November 2011, 02:29 AM	#1005
richluvsound diyAudio Member Join Date: Sep 2010 Location: LONDON	Ok ..... it would help if I didn't have the + and - the wrong way round . At least that explains the 8 fuses in the bin ! Now I have nothing , but distortion and the occasional pop .... Test speakers at low volume . Its the same out of both channels .... ????? any ideas guys ? Cheers , Rich

10th November 2011, 04:07 AM	#1007
Marra diyAudio Member Join Date: Nov 2009 Location: Near Lincoln	Rich build yourself a light bulb tester if you havent already done so it saves a fortune in blown fuses and generally stops anything from cooking. Won't tell you where the problem is but lets you know there is a problem before damage is done.

10th November 2011, 09:51 AM	#1009
richluvsound diyAudio Member Join Date: Sep 2010 Location: LONDON	Thanks Gents , I'll change the regs out to start with ... ! cheers, Rich

10th November 2011, 01:44 PM	#1010
richluvsound diyAudio Member Join Date: Sep 2010 Location: LONDON	Do I need to change regs on both boards or just the one blowing the fuse ... ? I changed the ones on the bad board and no change - still got the same distortion .... I have just ordered new caps 22uf and 3300uf ... I'll call pass this afternoon and order new j fets. Rich

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