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Old 10th May 2012, 03:36 PM   #1061
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Default Thanks Michael & all...

Hi again.

No - and yes - I have two sources: Squeezbox Touch that feeds through a DacMagic. And a HD980 CD-player that also is connected to the DacMagic. So I run both through the B1. And I can run the pre-out from my HK980 which also is relative good. But I think the B1 is so good - so you really relieved me now Michael.

Just a couple of resistors and soon ready to go.....rock and roll!!!


Best to all

Olav
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Old 10th May 2012, 05:12 PM   #1062
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Sounds like a job for a BOZ or JBOZ... My battery powered J310 based JBOZ works quite well...

Roscoe
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Old 10th May 2012, 05:21 PM   #1063
KASUMI is offline KASUMI  United Kingdom
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Hi,how do you guys get rid of the switch on thump,though I get no thump just the drivers cone popping out alarmingly
only just noticed today
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Old 10th May 2012, 05:37 PM   #1064
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One of the simplest ways to get rid of turn on thump is to put an inductor in the power supply. It resists a change in current, and so, turns on the power supply slowly. Result = no turn on thump. As a bonus, you get a quieter supply compared to a standard CRC. Start with 2mh, 16ga. Read the Zen articles.

Another way is to disconnect the speaker before turn on. And then are more complicated ways.
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Old 10th May 2012, 05:45 PM   #1065
Zen Mod is offline Zen Mod  Serbia
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and another way is to put delayed shortie in paralel with spk

there is cap , so no harm
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Old 10th May 2012, 11:16 PM   #1066
KASUMI is offline KASUMI  United Kingdom
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Hi thanks for that I still get the excursion when the amps have been switched on and then I reconnect the speakers
problem existed before the new caps.

Installed some new caps today,only one amp done at the mo
Click the image to open in full size.
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Old 10th May 2012, 11:29 PM   #1067
Zen Mod is offline Zen Mod  Serbia
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do you have bleeder resistor , in parallel with speaker ?
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Old 11th May 2012, 12:21 AM   #1068
KASUMI is offline KASUMI  United Kingdom
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Quote:
Originally Posted by Zen Mod View Post
do you have bleeder resistor , in parallel with speaker ?
nope,just using the basic cct.
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Old 11th May 2012, 12:42 AM   #1069
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A "bleeder" resistor across the speaker terminals will discharge the big output capacitor, which is a good idea. You could try a 3W 100 Ohm, for instance. A bigger value will discharge more slowly / smaller value more quickly.

As far as turn-on thump goes, my low-tech approach is to install a shorting banana plug across the speaker terminals, temporarily shorting the output to ground for a few seconds during power up, then I remove it. I may have mentioned this in the text.

Also, see the Zen Lite article for an automated version of the same idea.

Is that fancy square thing a capacitor?

Last edited by Michael Rothacher; 11th May 2012 at 12:45 AM.
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Old 11th May 2012, 08:07 AM   #1070
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Quote:
Originally Posted by KASUMI View Post
nope,just using the basic cct.
then put it
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