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
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
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
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
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
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
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
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Yes, but in his case it's better to know where the problem is
Bulb would be for another time ... good idea
I had it working last week ,but not with proper PSU . I turned it off and got some pretty frightening cracks through the speakers ....
I have not used it since .... When I say working board .. I mean it doesn't blow a fuse ...
I got the .0033 uF suggested ,put it in and lost another fuse . Now back to the 4x 1000pf I made up and fuse is ok .
Just changed cables ... thats not it . The distortion is consistent through L&R
I get sound ,but nothing I'd want to listen to, except maybe as an alternative to water-boarding .
Trying to laugh about it ,but it aint easy as the cost starts to eat into other things ! B1 is a thing of fantasy for the foreseeable future !
Wounded , but not dead yet , Rich
I have not used it since .... When I say working board .. I mean it doesn't blow a fuse ...
I got the .0033 uF suggested ,put it in and lost another fuse . Now back to the 4x 1000pf I made up and fuse is ok .
Just changed cables ... thats not it . The distortion is consistent through L&R
I get sound ,but nothing I'd want to listen to, except maybe as an alternative to water-boarding .
Trying to laugh about it ,but it aint easy as the cost starts to eat into other things ! B1 is a thing of fantasy for the foreseeable future !
Wounded , but not dead yet , Rich
That's wonderful news!
Start looking for backwards components. Then start measuring resistors one at a time.
Also, somewhere on this thread there is a schematic with the proper voltages drawn in. Check those.
Yes, Wayne is a wonderfully nice guy. I had a chance to sit down with him a pick his brain about the Pearl 2 at Burning Amp, I walked away more knowledgable and with a few insights into the project. A great guy through and through.
Start looking for backwards components. Then start measuring resistors one at a time.
Also, somewhere on this thread there is a schematic with the proper voltages drawn in. Check those.
Yes, Wayne is a wonderfully nice guy. I had a chance to sit down with him a pick his brain about the Pearl 2 at Burning Amp, I walked away more knowledgable and with a few insights into the project. A great guy through and through.