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Old 23rd January 2012, 10:45 AM   #911
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I tried using the electrolytic option for the Zobel over the weekend (I was getting some mid-band hardness and upper frequency brightness) using some Black Gate 47uF caps.
This option with the BA-2 front end didn't work producing a somewhat muddy sound with loss of overall detail so I replaced the resistors and the WIMA caps.
The problem was solved by reversing the Zobels which I use on the loudspeaker cables so that the capacitor contact was to ground. Sounds fine now.
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Old 23rd January 2012, 11:34 AM   #912
AndrewT is offline AndrewT  Scotland
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Back,
if your PSU is oscillating then guessing at what caps to use to stabilise it are a waste of everybodies time.

If your PSU is not oscillating then guessing at what caps to use to stabilise it are a waste of everybodies time.

The difference between these two statements is that you need to know if your PSU is oscillating. From there take appropriate action. Don't guess !!!!
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Old 23rd January 2012, 11:44 AM   #913
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Three things Andrew. First how would I know if my power supply was oscillating without any expensive equipment? Some of us use our ears to detect problems in the absence of said equipment and people are interested in these findings.
Second, my attempts at producing a better sound is not a waste of anyone's time except my own, which I am free to waste.
Third, the value of the caps is written in Salas's excellent build notes and not a guess.
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Old 30th January 2012, 09:38 PM   #914
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Just a simple and probably stupid question: is it possible to use a centre tabbed transformer for +/-reg or are dual secondaries needed? Have a really nice Mu-metal shielded one that I would really like to use

Gesendet von meinem MB526 mit Tapatalk
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Old 30th January 2012, 09:52 PM   #915
Salas is offline Salas  Greece
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Dual secondaries because there are two bridges, and it holds benefits. Otherwise, if you must use a nice C.T. Tx in hand, you got to rectify outside the regs, skip diodes on them and wire to the filter caps accordingly.
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Old 31st January 2012, 07:24 AM   #916
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Thanks, I'll think it over.
My regs (+/- 15V, ~200mA CCS) are working right from the start, they'll be used for a phonopre ;-)
Many thanks to Salas and Tea Bag for the great GB and support!
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Old 1st February 2012, 07:41 AM   #917
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is possible to use the shunt to supply a prephono?

supply voltage +15 -15, consumption 20nA (only two opamps like ne5532)

This is the project:

Hi-Fi RIAA Phono Preamp

any suggestions?
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Old 1st February 2012, 09:34 AM   #918
AndrewT is offline AndrewT  Scotland
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Yes, but don't use the HV version. The ordinary versions will do for 15Vdc.

The current to a 5534 or 5532 is not 20nA.
The peak current is limited to ~30mA for each channel.

The CCS must be set for more than 120mA. Try 150mA for each half of the regulated PSU to supply the 4channels in the two 5532.
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Old 1st February 2012, 09:37 AM   #919
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ok so 150ma on + half and 150ma an - half right?
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Old 1st February 2012, 09:42 AM   #920
AndrewT is offline AndrewT  Scotland
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yes.
The transformer feeding the PSU should be rated at ~ 4times that CCS current, i.e. 600mAac
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