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Old 9th July 2012, 07:13 PM   #1631
mjock3 is offline mjock3  United States
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It is KW
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Old 9th July 2012, 09:12 PM   #1632
acidbrain is offline acidbrain  Netherlands
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KZ is the best, FG is also good. Use highest voltage types they have the best specs.
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Old 9th July 2012, 11:36 PM   #1633
mjock3 is offline mjock3  United States
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Originally Posted by acidbrain View Post
KZ is the best, FG is also good. Use highest voltage types they have the best specs.
Thanks, your suggestion got me digging and I did put the wrong one in. Just switched it out with a KG which is what I meant to put in. And the rough edge is gone.
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Old 10th July 2012, 12:02 AM   #1634
mjock3 is offline mjock3  United States
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I should ask have you ever tried the KG's? Someone had recommended them.
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Old 10th July 2012, 09:28 AM   #1635
acidbrain is offline acidbrain  Netherlands
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Yes, I use them in my poweramp, the ones with the "golden feet", type III. They are somewhat bigger than the other types. Don't know if it's really better but the specs say yes.
KG are a little bit dark but pleasant all the way. Now I work more with KZ, 4700UF KZ (5x 1000uF) sound more alive and with better image than KG. I need less optional parts(teflon/mks for highs and acoustic ) to get the sound I want. KG in poweramp + preamp + phonoamp is too much, shut in dark sound. too much of anything is never good : you control the spices !
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Old 11th July 2012, 02:23 AM   #1636
schubert is offline schubert  United States
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Default Problems with my build - help!!

Here's my build - pretty standard, 18V is my target. I'm using a 24V transformer, but I only get 3.8V at the output, and adjusting the trimmer doesn't have any effect. All the LEDs light up, and all the right parts are in the right places. (The trimmer is in backwards, but it doesn't fit the other way and it shouldn't make any difference anyway, as long as the wiper is in the middle.) There's about 293mA through R101 (10 ohm), about what I was aiming for. However there's a 25V drop over Q101 (R101 to output) and only 0.1mA through R103, neither of which seems right to me, though I don't know what they should be. Q101 gets pretty warm after a bit but Q306 doesn't. Other voltages: 0V across R102, 115mV across R108, 3.8V over C102, 0V over Q103, 0V over R106. 24.8V over Q102. Can anyone help?
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Old 11th July 2012, 02:44 AM   #1637
Salas is offline Salas  Greece
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First you got to get rid of the cables to the Mosfets. Only local PCB fit. You got wrong shape sinks for easy side or bottom fit I see.
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Old 11th July 2012, 09:37 AM   #1638
pedefede is offline pedefede  Denmark
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Quote:
Originally Posted by Salas View Post
150-220R will aid noise filtering if left as minimum in the Vref area.
Fabelous discussion about the dynamic resistance, Salas, Andrew, merlin and others!

Is the adviced 220uF for C101 (in case of zeners, or dig clocks) based on the adviced minimum impedance on 150-220 ohm in the Vref chain??

Is 220 an optimal value, or could it be as big value as possible??

If yes, could the minimum impedance be lower for the Vref chain, if you used say 1500uF?

Peter
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Old 11th July 2012, 09:45 AM   #1639
Salas is offline Salas  Greece
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Yes, I had run noise sims with 220uF and 200R. It can be a bigger cap for lower impedance depending how effective you wanna be for below 1/f noise knee. Keep in mind that an non damped big cap can stretch semis during on/off there will be a practical threshold for each Vo level they could take.
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Old 11th July 2012, 12:18 PM   #1640
pedefede is offline pedefede  Denmark
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Quote:
Originally Posted by Salas View Post
Yes, I had run noise sims with 220uF and 200R. It can be a bigger cap for lower impedance depending how effective you wanna be for below 1/f noise knee.
So double C and half R (like 440uF and 100 ohm) would give the same frequency knee ??
And higher C, and same R - for better 1/f noise knee

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Originally Posted by Salas View Post
Keep in mind that an non damped big cap can stretch semis during on/off there will be a practical threshold for each Vo level they could take.
2)
Do you mean that the big cap will unload charge through the Vref-chain, and give a high peak-current, Io? I tried to analyze it, and i cant see how - since basically the Current at on/off is the same as the normal working current, and is limited by R103:

in my understanding the size of the peak-current isnt determined by C. It is I = Io*exp(-t / RC). So C only determines the length of the peak.

Io is limited by the resistor, so Io = Vr / R103
Now asuming the chain is R + Zener:
- then Vr (V over R103) = Vtotal - V(zener)
- which basically gives the same Io as normal working current, determined by Idss of K117.

So if you make R103 less and C bigger, - Io stays the same, because V(zener) has to be bigger.

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