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Old 29th November 2004, 12:11 PM   #11
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You are absolutely right. I missed that Gilmore's example to the reference voltage from the regulated output.

Anyway, I can't see the real benefit of a tracking supply in an audio application.
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Old 29th November 2004, 12:31 PM   #12
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always symmetrical rails, independently of the variations?
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Old 29th November 2004, 12:40 PM   #13
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Lightbulb Dual Tracking Regulator

Per-Anders, I knew Quirck was right....
You really should consult Horowitz to see any advantage......
Here is an example more to your taste (more parts, complicated design, not SMD though):
It is for the Mark Levinson ML-7 preamplifier.
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Old 29th November 2004, 12:42 PM   #14
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Default second part

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Old 29th November 2004, 01:01 PM   #15
Electrons are yellow and more is better!
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Quote:
Originally posted by Bricolo
always symmetrical rails, independently of the variations?
.. but why has it to by symmetrical in the first place!
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Old 29th November 2004, 01:15 PM   #16
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Quote:
Originally posted by peranders

.. but why has it to by symmetrical in the first place!

maybe the variations on the ps rail aren't transmitted to the output in a symmetrical tracking ps

imagine an opamp, AC coupled signal going into it.
If the ps rail are -12 0 +12, 0V DC at the output
if there's a variation on the ps rail, but the ps is a tracking one, the rails become -10 0 +10, still 0V DC output

but if the ps isn't tracking, the rails can become -8 0 +12, and here you'll have DC
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Old 29th November 2004, 01:46 PM   #17
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Well in case of extra load on either the positive or negative line, the regulator will regulate the voltage back to the correct level. Therefore called a regulator.

You will never get +8 0 -12 V!

The load regulation is something like 30 mV from 0 mA to 1 Ampere.
So you will get 11.97 0 -12V (if your op-amps use 1A on the positive rail and 0 mA on the negative rail) ((in that case i guess you probably have DC anyway, but not from the regulator offset))

Another thing: if we are talking about a tracking regulator, which by some is defined by the negative rail tracking to the output of the positive rail, what happens if the extra load happens to be on the negative rail. Will the positive rail then track that change?

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Old 29th November 2004, 01:52 PM   #18
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Quote:
Originally posted by Lars Clausen
what happens if the extra load happens to be on the negative rail. Will the positive rail then track that change?
Good question!... see my point?
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Old 29th November 2004, 02:06 PM   #19
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Quote:
but if the ps isn't tracking, the rails can become -8 0 +12, and here you'll have DC
No, you don't.
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Old 1st December 2004, 06:23 PM   #20
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