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Bksabath

Bksabath

Banned
Joined 2007
sq225917 said:
Sabbath, what transformers did you use?
Click to expand...

Now I use 18 / 18 V AC from RS Components
That picture was Beta PSU
I tried seletronic Race cores 24 / 24 but those have realy poor spec and voltagge was sky hi stay weel clear of those

Paradise sinks suplied on the goodies bag can not take the 24/24 but this can be solved with an extra CRC

IMO Idealy I wuld use 20 / 20 ac and same CRC
I got no pictures of the last ones
PSU with Race cores
and EXTRA CRC this mounted close bay to paradise boards

The details of my Build for R2 are here if you can put up with my frivolous spelling
http://www.diyaudio.com/forums/analogue-source/220354-my-paradise.html
 

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Last edited:
B

brozatus

Member
Joined 2006
Hi guys,

I really appreciate your helping advices.

At first I built up a rectifire bridge like shown here:

Google-Ergebnis für http://www.vias.org/mikroelektronik/img/bridgerect.png
Now I have:
24,2 v dc
52,9 v ac

then I added a resistor (10k) and a capacitor (10000uF)
like it is shon here:
Google-Ergebnis für http://upload.wikimedia.org/wikipedia/commons/c/c2/Gleichrichter-Schaltung.svg

Now I have
37,3 v dc
81 v ac

This was for testing the dmm

Back to my board:
Next I added a load as Pavel (and Joachim) insisted,
5000 R parallel to the outputs (plus vdc to ground and
minus vdc to ground)

Now I have (each side)
35,9 v dc
78,8 v ac

parallel to the load.

I think there is something wrong,
I have to borrow another dmm for
checking.

Christoph
 
PMA

PMA

Member
Joined 2002
pmacura.cz/audiopage.html
Paid Member
Christoph, I think you may believe DC measurement you made at the DC side of the power supply. And just forget the AC measurement that the DMM made on the DC part of the circuit. Some cheap multimeters make similar mistakes (= they do not separate DC from AC and then recalculate wrong - like twice the low pass filtered AC value, which in case of DC makes the AC error you have shown), I have experienced that before. In case you borrow another DMM, please try to have one that measures TRUE RMS (they have it indicated in specs sheet).
 
Last edited:
RCruz

RCruz

Member
Joined 2006
Paid Member
PMA said:
Christoph, I think you may believe DC measurement you made at the DC side of the power supply. And just forget the AC measurement that the DMM made on the DC part of the circuit. Some cheap multimeters make similar mistakes (= they do not separate DC from AC and then recalculate wrong - like twice the low pass filtered AC value, which in case of DC makes the AC error you have shown), I have experienced that before. In case you borrow another DMM, please try to have one that measures TRUE RMS (they have it indicated in specs sheet).
Click to expand...
+1

It happened to me before with a noname DMM
 
B

brozatus

Member
Joined 2006
Ok, here we have the values measured by a novice (me)
with a professional dmm:

Output each rail is
36,8 v dc,
0,002 v ac

35,9 v dc with 5000 r in parallel.

With the 2x24 v transformator I have a little high dc I
think? Or is this fine and you give me a go?

Thanks for your great helping!!!!!!!!!

Christoph
 
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