Bride of Zen pre with 30-0-30AC tranny (not 0-60V) ? - diyAudio
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Old 18th December 2005, 08:32 AM   #1
methar is offline methar  Thailand
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Default Bride of Zen pre with 30-0-30AC tranny (not 0-60V) ?

Hi,

I almost finish my bride of zen pre. except the PS. As I already have 30-0-30V ac transformer, I wonder if it can be used by connecting both 30Vac to the rectifier and leave the centre tab floating ??

If so, seems the virtual groud is negative rail. Will it cause hum when connecting to components (e.g. DAC, amp) which the ground is actually zero ??

Thanks for all suggestion!
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Old 18th December 2005, 12:35 PM   #2
Skorpio is offline Skorpio  Denmark
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You can consider a 30-0-30V trafo as a center tapped 0-30-60V also....so it will work

If the secondary is to seperate 30V windings, be sure to connect them in series, so the result is one 60V...
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Old 18th December 2005, 01:45 PM   #3
methar is offline methar  Thailand
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Quote:
Originally posted by Skorpio
You can consider a 30-0-30V trafo as a center tapped 0-30-60V also....so it will work

I already have 30-0-30 transformer now. Could you confirm if the following is correct?

Thanks in advance.
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File Type: gif 30-0-30tx.gif (3.7 KB, 405 views)
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Old 18th December 2005, 01:50 PM   #4
methar is offline methar  Thailand
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sorry the photo it's too small. here is the bigger one.
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Old 18th December 2005, 03:03 PM   #5
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Hallo methar, you got it!
chiao Andreas
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Old 18th December 2005, 03:27 PM   #6
methar is offline methar  Thailand
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Quote:
Originally posted by Orgonom
Hallo methar, you got it!
chiao Andreas
Thanks for your answer.

Just a dummy question I am facing when try using that config.

See photo attached.

Buzz (50 or 120 Hz) occur when connect the pre-zen to LM3875 chip amp. This amp has no buzz/hum when directly driven by CD player. My friend try this pre-Zen with amp and he said it worked fine.

What points of cause can be and what fixes should be done?

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File Type: gif buzz_when_pre_and_poweramp_connected.gif (13.1 KB, 386 views)
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Old 18th December 2005, 06:18 PM   #7
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Are pre and LM power in separate chassis/boxes?

Try this with separate power cables to mains. You probably are making ground loop with this connection. Thatīs why buzz come up.

Cheers

JC
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Old 18th December 2005, 06:23 PM   #8
methar is offline methar  Thailand
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Quote:
Originally posted by JC Fardo
Are pre and LM power in separate chassis/boxes?

Try this with separate power cables to mains. You probably are making ground loop with this connection. Thatīs why buzz come up.

Cheers

JC
They are on different boxes so using different power cords to the electric power outlets.

I am getting more worry how to make it solved now -__-"

Please helps!
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Old 19th December 2005, 02:55 PM   #9
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methar

For the BOZ:

Comercial trafos (Avel, Toroid) have four secondary wires. For the BOZ we have:

-30V
-0V
-0V
-30V

Both "0-0" are series connected to provide 60V AND this connection must connect to the SAME ground point of the PCB(s) in the box.

Reading your scketch I think you did right in the LM circuit.

Try again. Cheers.

JC
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Old 19th December 2005, 10:27 PM   #10
methar is offline methar  Thailand
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Quote:
Originally posted by JC Fardo
methar

For the BOZ:

Comercial trafos (Avel, Toroid) have four secondary wires. For the BOZ we have:

-30V
-0V
-0V
-30V

Both "0-0" are series connected to provide 60V AND this connection must connect to the SAME ground point of the PCB(s) in the box.

Reading your scketch I think you did right in the LM circuit.

Try again. Cheers.

JC

Do you mean the Bride of Zen need to do ground like this?
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