Pumpkin preamp - ordered by Steen , official making thread - Page 241 - diyAudio
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Old 27th September 2008, 07:17 AM   #2401
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tabs shorted ?
send me a mail , so we can discuss it in details , what's wrong (or not)
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Old 27th September 2008, 12:06 PM   #2402
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yeah, I'm using these:

http://www.fairchildsemi.com/ds/BD/BDX53C.pdf
http://www.fairchildsemi.com/ds/BD/BDX54C.pdf

pin-out is BCE and on the schematic the collectors of each are tied to each other and ground. The 2 IRF are isolated from each other and from the above devices.

So, I'm assuming only putting 1 fuse in is supposed to work?
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Old 27th September 2008, 02:13 PM   #2403
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Looky:

http://picasaweb.google.com/luvdunhill/Shunty
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Old 27th September 2008, 03:03 PM   #2404
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Tobacco man .......

please re-frase everything to me :

is your Shunty malfunctional , or you just have doubts about darlington pinout ?
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Old 27th September 2008, 03:38 PM   #2405
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um. I think my darlington parts are okay and things are properly installed on the heatsink. I just put a single fuse in the positive rail and powered it up and only had a few volts on output (and before the fuse for that matter) and the rest of the voltage was before the fuse on the second rail. So, I wasn't sure if I need to put both fuses in to test So, yes either it is malfunctioning, or the operator is malfunctioning
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Old 27th September 2008, 03:58 PM   #2406
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why you dont connect the white cable the "GND"?.
The 2 blue to the AC and the white to GND or 0V.
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Old 27th September 2008, 04:16 PM   #2407
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Quote:
Originally posted by luvdunhill
um. I think my darlington parts are okay and things are properly installed on the heatsink. I just put a single fuse in the positive rail and powered it up and only had a few volts on output (and before the fuse for that matter) and the rest of the voltage was before the fuse on the second rail. So, I wasn't sure if I need to put both fuses in to test So, yes either it is malfunctioning, or the operator is malfunctioning

dunno what's happening ;

mail me directly >choky@neobee.net<
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Old 28th September 2008, 02:46 AM   #2408
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yay one shunty works gets a bit tosty with the testing resistors, but looks great! next shunty will have to be tested tomorrow.
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Old 28th September 2008, 08:16 AM   #2409
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Quote:
Originally posted by luvdunhill
yay one shunty works gets a bit tosty with the testing resistors, but looks great! next shunty will have to be tested tomorrow.



white wire ?
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Old 28th September 2008, 07:27 PM   #2410
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yay, both Shuntys work! now, onto the Pumpkins.. Can I plug them in and adjust them without a pot? I've had balanced amps that you have to adjust things with the pot turned down, or ground the inputs, so I wasn't sure if that applied here or not.
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