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Old 20th December 2005, 07:31 PM   #311
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Does a shorted capacitor do anything?
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Old 20th December 2005, 07:37 PM   #312
doggy is offline doggy  Canada
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Do you mean from the 0r jumper to ground? A straight cap in the 0r jumper spot will not work at all for me;I tried a few different values. Brian I am happy, it's sounding good.

Just to inform; the pre was working all along with th 0r jumper in but I just wanted to see if I could match it better to my system.

doggy

p.s doing my xmas polishing; he..he..
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Old 20th December 2005, 07:49 PM   #313
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Glad it's working and sounding good.

I just mean a 0-ohm jumper across the pins of a cap is shorting the cap, unlike a resistor that would send some current through the cap. I test would be to measuer voltage across the cap pins. Just curious.
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Old 20th December 2005, 07:57 PM   #314
troystg is offline troystg  United States
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Current takes the path of least resistance, and there is NO voltage accross a short.

A cap accross a 0 (zero) Ohm jumper is non-existant.

Jumper to ground or V may have an affect, but accross (in parralell with) the jumper has none.

Sorry just Ohms law not mine.
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Old 20th December 2005, 08:09 PM   #315
doggy is offline doggy  Canada
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It must be fooling myself again. There is definitely something flowing between those two points. It could be the"proud papa syndrome"-

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Old 20th December 2005, 08:39 PM   #316
troystg is offline troystg  United States
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Quote:
Originally posted by doggy
It must be fooling myself again. There is definitely something flowing between those two points. It could be the"proud papa syndrome"-

cheers
doggy

Keep in mind that your 0 (zero) Ohm jumper may not be EXACTLY 0 Ohms..

But I would expect it to have to be off pretty far for a cap to be audible in that position.
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Old 20th December 2005, 08:49 PM   #317
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Yes of course there is something flowing between those two points. There is meant to be.

A bypass cap will not do anything for you but a very small resistance (like the jumper provided) or a 1-4.7R resistsor just provides a bit of isolation.
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Old 20th December 2005, 08:56 PM   #318
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Quote:
Originally posted by doggy
It must be fooling myself again. There is definitely something flowing between those two points. It could be the"proud papa syndrome"-

cheers
doggy

While the analog part of the circuit has dual rails the digital portions only have V+ and GND(0V) so a cap in place of the jumper effectively blocks all current to the digital circuity, thus causing it not to work at all. That is why it will only work when you have a small value resistor or a jumper there. The cap you added will always be swamped, and thus is doing you no good as the current will always take the easy path accross the jumper or resistor.

Good work! Very nice preamp. I hope you enjoy it.

Cheers!
Russ
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Old 22nd December 2005, 01:58 PM   #319
Nordic is offline Nordic  South Africa
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Ta Max.. that one looks perfect. I just ordered the parts...
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Old 23rd December 2005, 09:15 AM   #320
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i upgraded my kookaburra preamp with a SMD headphoneamplifier, sounds great together with the Kookaburra!
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