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Old 10th July 2012, 04:00 AM   #91
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I've been running an aleph mini on some apexjr smps for a few years. Sound was much improved by adding some 1000uf caps after the smps.
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Old 10th July 2012, 04:02 AM   #92
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For a simple, great sounding, set of full rangers the Betsy K in a 1 1/2 cubic foot box is a good choice.

(made in america, just like the amps. And cheaper than fostex too.)

Last edited by Variac; 27th August 2012 at 08:55 AM.
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Old 10th July 2012, 05:30 PM   #93
Ipanema is offline Ipanema  Malaysia
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Will SMPS becomes unstable with larger power supply filter caps? there's only a 10uF in the diagram.
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Old 10th July 2012, 05:38 PM   #94
Zen Mod is offline Zen Mod  Serbia
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it depends of type of SMPS

some are brick like solid , some are sensitive to sparrow's fart
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Old 10th July 2012, 05:41 PM   #95
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Thats certainly a possibility. These were modules (not encased) for which the datasheet was available. There was a mention of additional RC filtering, but I can't remember the values they used. I figured 1000uF was safe, and it's turned out fine.
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Old 10th July 2012, 06:02 PM   #96
Ipanema is offline Ipanema  Malaysia
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Can i increase output voltage swing by tying r7 to higher voltage?
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Old 10th July 2012, 06:38 PM   #97
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Quote:
Originally Posted by Zen Mod View Post
it depends of type of SMPS

some are brick like solid , some are sensitive to sparrow's fart
sensitive to sparrow's fart good one
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Old 10th July 2012, 09:19 PM   #98
Zen Mod is offline Zen Mod  Serbia
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yup

as always , I'm here to serve ........ and protect


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Old 10th July 2012, 09:29 PM   #99
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hehe ZM. nice that someone does
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Old 11th July 2012, 06:11 AM   #100
LBHajdu is offline LBHajdu  United States
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I put a 15,000uF cap on the SMPS that came with my Tripath amp to try and get rid of the hiss. It destroyed it instantly. It's not serviceable. Not all SMPSs can take high capacitance on there output.

Filtering for the jfet could easily be done with an RC network (maybe 2K and 1,000uF). There is lots of voltage to spare. It could be used to find a “Sweet Spot” in the Pass article “The Sweet Spot” an example is provided:

Quote:
Here is an example of a JFET follower whose characteristic is mostly “pentode-like”. The upper curve reflects the distortion at V+ voltage near the device rating, and the lower curve shows the distortion cancellation available by searching for the “sweet spot” at a lower supply voltage. You can see that at 1 volt, the distortion has been reduced by about 85%.

Last edited by LBHajdu; 11th July 2012 at 06:25 AM.
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