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Old 12th January 2009, 08:24 AM   #11
WBRO is offline WBRO  Poland
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> Dear Mr. Pass, Sirs,

I have question about third bridge B3 on power supply schematic (F5 Power Amp) below:

http://www.audiostereo.pl/zalaczniki/1245518_1.jpg

What is main role this bridge ?



Regards
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Old 12th January 2009, 09:28 AM   #12
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Quote:
Originally posted by WBRO
> Dear Mr. Pass, Sirs,

I have question about third bridge B3 on power supply schematic (F5 Power Amp) below:

http://www.audiostereo.pl/zalaczniki/1245518_1.jpg

What is main role this bridge ?



Regards

- that is not F5 PSU

- third graetz is sort of ground lifter - to separate chassis and tone gnd , but to preserve safety
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Old 12th January 2009, 09:45 AM   #13
WBRO is offline WBRO  Poland
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Thank you very much.


Regards
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Old 13th January 2009, 03:04 AM   #14
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Quote:
Originally posted by elac310


As regards the capacitor voltage, I would personnally keep some safety margin: at "turn on" there can be a short voltage spike...


I think you're confusing voltage and current. Yes, there is a current spike. No, there's not a voltage spike. Check it with a meter and you'll see. Better yet, use an oscilloscope.
The only time you need caps with higher voltage ratings is if you're running an LC or RC filter. The inductor (or resistor) keeps the operating voltage below the typical 1.4 ratio you'd expect for a filter beginning with a cap. If--and only if--the circuit ceases to draw power, the rail will rise from the reduced rail dictated by the inductor (or resistor) to the 1.4 ratio inherent in the peak AC value. Given that not many people use LC filters these days (it was mainly a tube thing), you'll rarely run into this.
All other factors being equal, higher temperature ratings are good for caps, but I wouldn't get obsessed with it. If you find a good deal on lower temperature caps, buy them. Use them with ventilation and all will be well.

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Old 13th January 2009, 03:12 AM   #15
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Quote:
Originally posted by WBRO
I have question about third bridge B3 on power supply schematic (F5 Power Amp) below:

http://www.audiostereo.pl/zalaczniki/1245518_1.jpg

What is main role this bridge ?
This is from one of the Zen projects.

The function of B3 is to provide a connection from analog ground to
AC Earth ground whose diode drop isolates the grounds up to .6V
between each channel and also the Earth ground. This prevents
ground loops while giving shock protection from a line voltage
appearing on a signal ground.

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Old 13th January 2009, 08:55 AM   #16
WBRO is offline WBRO  Poland
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>Mr.Pass

Thank you for explain



Kind regards
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Old 13th January 2009, 10:09 AM   #17
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Quote:
Originally posted by kop89
Thank you Dennis

This is a very, very, very, very good price

I just called Apexjr and ordered 32 of these. This will give me 240000uF per channel, should be enough.

how are the new caps
are they snap In 63 V 105
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Old 16th January 2009, 03:43 AM   #18
kop89 is offline kop89  United States
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Quote:
Originally posted by samoloko



how are the new caps
are they snap In 63 V 105

The caps look good, exactly like the picture:
http://www.apexjr.com/images/15000UFCAP.jpg


I am a little confused on what kind of transformer I need to use. The KK-PCB website shows 600VA, 2x37V secondaries: http://www.kk-pcb.com/power-2.html

But I read somewhere that the rail supply spec is +/- 45V, which suggests 2x33V secondaries.

I am thinking about 1000VA, 2x35V secondaries from Avel-Lindberg. Would this work fine?
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