CLC vs CLCLC Filter Power Supply - diyAudio
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Old 29th March 2013, 04:13 AM   #1
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Default CLC vs CLCLC Filter Power Supply

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Last edited by HP8903B; 3rd March 2014 at 10:01 PM.
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Old 29th March 2013, 04:42 AM   #2
GoatGuy is offline GoatGuy  United States
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It all depends on the current draw, really. Of course adding more C and more L is going to squash those darn ripples better. Is it needed?

What's it driving! If some nice push-pull final, then the ripple is in common to each phase, so rather significantly cancelling. Differential type amplification is like that. It is one of the reasons (apart from efficiency) why it has persisted so long, and was invented so early in the Tube Game. Even though significant (1% or more) power supply ripple might be in play, when there's no input, you cannot hear "the hum". Entirely different for single-ended amplification.

Now this is not to say that "no sound = no effect". The wavering total B+ has an effect on the instantaneous amplitude of the final-phase signal stream. This results in a kind of modulation of output, when there's output. If one where to have a single sinusoidal input to an amplifier at say 70 Hz (with 60 Hz American continent mains), then with 1% ripple, you definitely could hear a 10 Hz "beat" imposing itself. Not musical. Hence why a good design, using a combination of [u]"whatever's cheapest and most effective to accomplish the end"[u] is used.

Again, what's the nominal and peak current draw?

GoatGuy
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Old 29th March 2013, 04:57 AM   #3
Magz is offline Magz  United States
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Answer: neither of those would be my choice.

LCLC sounds much smoother to my ears. Choke input rules!
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Old 29th March 2013, 05:00 AM   #4
Enzo is offline Enzo  United States
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But at a significantly lower voltage.
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Old 29th March 2013, 05:24 AM   #5
Magz is offline Magz  United States
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Just need a bigger transformer, that's all, and you'll get the same voltage.

I'm building a 2300V choke input supply right now.
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Old 29th March 2013, 05:25 AM   #6
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Constant current draw is 85mA
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Old 29th March 2013, 05:27 AM   #7
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Old 29th March 2013, 05:37 AM   #8
tomchr is offline tomchr  United States
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How much ripple is tolerable depends on the design of your amp and the efficiency of your speakers. With my 300B SET design and 87 dB (1 W, 1 m) efficient speakers, I found that I want the B+ ripple below 1 mV (preferably below 500 uV) to avoid audible hum at the listening position.

That's one data point...

~Tom
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Old 29th March 2013, 05:41 AM   #9
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What are all the differences between high ripple voltage (300mV) and low ripple voltage (1mV) ?

Is it just hum level ?
What about sound quality ?

This amp will drive a 16" woofer with 98dB.
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Old 29th March 2013, 12:41 PM   #10
DF96 is offline DF96  England
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High ripple may create hum IM sidebands, which might not be cancelled in a push-pull output as bare hum is. Unless the ripple is really high this is unlikely to be a problem.
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