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Old 11th February 2004, 02:24 PM   #21
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Hello Tyimo!

1. You can use 2 paralel, but I recommend the 5ohm type
"...TH1 is a power thermistor used to connect the circuit and chassis ground to the AC outlet
ground. It will normally operate at 5 ohms, suppressing ground loops in the system, but will
drop to a low impedance if significant current is passed through it...."
2. Yes, you can put between AC fuse and switch
3. From service manual:
"...The voltage rails of the supply are at 34 volts, and each channel draws approximately 150
watts.
...
F1 is a slow blow fuse, set at 4 amps for 100-120 volt operation, and 2 amps for 220-240
volt operation."
4. In my opinion CLC, check out kristijan's homepage (link above)

BR,
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Old 11th February 2004, 02:30 PM   #22
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Default Re: Thermistor?

Quote:
Originally posted by Tyimo
-Should I use 2 pieces 22R 3W thermistors paralel instead of the 1 10R5W-er?
If you are going to use them for current limiting, you should take a look at this thread about the thermistor that Pass Labs uses. Assuming you have 220VAC, you might think about 2 - 10ohm in series to get the inrush current down.
Quote:
Originally posted by Tyimo
-Should I put them between AC fuse and switch?
I think either way will work.
Quote:
Originally posted by Tyimo
-How many Amps draw the stereo Aleph5 from the AC socket?
The manual says 300W, so it's 300/VAC = Amps.
-What is the best PSU-caps arrangement-conection? [/B][/QUOTE]
I like the CLC, but most any other arrangments will work.
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Old 11th February 2004, 08:00 PM   #23
Tyimo is offline Tyimo  Hungary
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Mpopovics and Roddyama!

Thanks!

Quote:
"F1 is a slow blow fuse, set at 4 amps for 100-120 volt operation, and 2 amps for 220-240
So, could I use a 4A 250VAC main AC filter for the stereo Aleph5? Isn't too weak?
Could be only 1 piece 3W-er thermistor is enough for current limiting?

Thanks
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Old 11th February 2004, 08:09 PM   #24
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2 amps is just fine for stereo

P=U*I -> I=P/U=300W/240V=1,25A

BR,
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Old 20th February 2004, 10:22 PM   #25
SteveA is offline SteveA  United States
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Default What value for L? Does it matter?

I have seen 2.2 mH on Kristijan's site but I believe I have seen recommendations of 1.1 also. A recommendation from someone in the know would be appreciated.
SteveA
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Old 20th February 2004, 10:29 PM   #26
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Default Re: What value for L? Does it matter?

Quote:
Originally posted by SteveA
I have seen 2.2 mH on Kristijan's site but I believe I have seen recommendations of 1.1 also. A recommendation from someone in the know would be appreciated.
SteveA

According to Nelson Pass.
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Old 21st February 2004, 03:02 PM   #27
SteveA is offline SteveA  United States
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Hi Rodd-
Thanks. In the reference was a comment that most of the capacitance should be after the inductor. Is that mandatory? I have some 50v 68000 caps which I was planning on using two per channel with the inductor between them. Duncan's PSU indicates a voltage of +/- 31.9 v. This would seem to be in the hunt (yes?).

I also have some 75 v 22000 caps but they're big as Buicks.

Steve
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Old 21st February 2004, 04:26 PM   #28
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Quote:
Originally posted by SteveA
Hi Rodd-
Thanks. In the reference was a comment that most of the capacitance should be after the inductor. Is that mandatory? I have some 50v 68000 caps which I was planning on using two per channel with the inductor between them. Duncan's PSU indicates a voltage of +/- 31.9 v. This would seem to be in the hunt (yes?).

I also have some 75 v 22000 caps but they're big as Buicks.

Steve
I know the 50X68kuf. Those are pretty good caps. There are a few recent projects using them. I'll probably use them myself in my up coming amp.
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Old 22nd February 2004, 08:02 PM   #29
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Quote:
Originally posted by SteveA
In the reference was a comment that most of the capacitance should be after the inductor. Is that mandatory
No, but as a practical matter, we usually get a batch of the
same kinds of caps, so we tend to put the same capacitance
before the inductor as after. The only danger is in putting
way too little on either side, but once you have at least, say,
10,000 uF before and after, you're on your way. You have to
insure that the "before" caps meet the ripple current rating,
and after that, it's pretty arbitrary, as increasing capacitance
on either side reduces the noise that the circuit sees by
inverse proportion.

Having too much capacitance on either side can be a problem
with regard to initial turn-on inrush currents, but there are
plenty of ways to deal with that, thermistors being one popular
approach.

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Old 23rd February 2004, 04:27 AM   #30
SteveA is offline SteveA  United States
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Default Thermistor approach

Thanks Mr Pass-
I will be using a rectifier which I saw Wayne Sankey use on his Aleph 2 project. The board has provisions for two thermistors. I hope that will be sufficient.

SteveA
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