I have a bunch of lm338 left over from an old project.
Would an lm338 make good sense for powering an ACA mini?
Would a cap mx be superior?
Cap mx + lm338 overkill?
Would an lm338 make good sense for powering an ACA mini?
Would a cap mx be superior?
Cap mx + lm338 overkill?
Oddly enough, integrated regulators don’t work well at helping a Class A amp sound good.
I once tried using one as part of an ACA power supply. The amp sounded better with a simple CRCRC supply. The regulator choked off the sound.
My recommendation for an ACA Mini is to keep things simple.
I once tried using one as part of an ACA power supply. The amp sounded better with a simple CRCRC supply. The regulator choked off the sound.
My recommendation for an ACA Mini is to keep things simple.
Interesting.
I've seen it stated lots that regulator ics don't work well with class ab output stages due to not being fast enough etc.
I would have thought that the constant current demand of class a would make them more suitable.
I've seen it stated lots that regulator ics don't work well with class ab output stages due to not being fast enough etc.
I would have thought that the constant current demand of class a would make them more suitable.
”The regulator choked of the sound”
What? 🙂
In other words, a clean, regulated power supply is bad for ACA mini.
I am not an PSU active regulation expert by any stretch of the imagination, but still: I cant figure out how that even possibly could be true, and how that would work in reality, can you?
What? 🙂
In other words, a clean, regulated power supply is bad for ACA mini.
I am not an PSU active regulation expert by any stretch of the imagination, but still: I cant figure out how that even possibly could be true, and how that would work in reality, can you?
CapMx with a MosFet plus a few big caps after will be always superior IMHO.
Problem is you need to carefully match everything downstream to get 24V at the end.
Not difficult but not trivial either.
Yea, thats right. But it still do not think it really seems to makes any real sense?
A Cleaner and more stable power delivery to a class A circuit (any class A circuit) should make things better is my logical conclusion at this point.
The ACA mini should not ”care” how the power got very clean and stable. With the help of a integrated circuit or with a circuit with only discrete components.
Clean and stable PSU is: a Clean and stable PSU, no matter how? 🙂
A Cleaner and more stable power delivery to a class A circuit (any class A circuit) should make things better is my logical conclusion at this point.
The ACA mini should not ”care” how the power got very clean and stable. With the help of a integrated circuit or with a circuit with only discrete components.
Clean and stable PSU is: a Clean and stable PSU, no matter how? 🙂
The supply current varies over a wide range depending on output voltage and load impedance.
At max output of say -/+10 volts into 8 ohms the load current is -/+1.25 amp and the supply current is the ACA's nominally set quiescent current of about 1.6 amp that then varies up and down with the load current. So the supply current can be in the region of as low as 1 amp to approx 2 amp over 1 cycle of the output waveform.
It is still Class A as neither device approaches cut off but it is not constant current Class A.
Ok, so the current is not constant to the ACA mini. 🙂
But does that mean that the LM338 is to slow and always would starve the ACA mini, no matter the configuration of the capacitor bank in the PSU?
But does that mean that the LM338 is to slow and always would starve the ACA mini, no matter the configuration of the capacitor bank in the PSU?
I am of the opinion that all sonic differences might not be easily measured or is simply not yet possible to measure with now existing measuring equipment.
And whenever in doubt, if it actually sounds better: It IS better. Trust your own tapping toes and ears. 🎸🙂🎺
But it is always interesting to hear the logical chain that lead to the conclusion that this or that technical solution is ”always better”.
And whenever in doubt, if it actually sounds better: It IS better. Trust your own tapping toes and ears. 🎸🙂🎺
But it is always interesting to hear the logical chain that lead to the conclusion that this or that technical solution is ”always better”.
Neither pr
Simply by scoping supply rail(s).
If ruler flat, no bad (or good) effect possible.
If active regulator visibly drops voltage under drum kicks or similar, then it may.
No more, no less.
Neither for nor against, not enough data, but as usual: I would measure it.
Simply by scoping supply rail(s).
If ruler flat, no bad (or good) effect possible.
If active regulator visibly drops voltage under drum kicks or similar, then it may.
No more, no less.
Well I've made a big mistake in one sense because I mistakenly thought I was looking at the regular ACA rather than the mini...
The current in the output transistors in the ACA mini still behaves in a similar way though although the ACA mini has a massive reservoir cap at 15000uF and that could cause issues on the output of a regulator, in fact it would defeat the purpose of a reg which ideally needs to be fast in response meaning only a very small cap on its output. With a small cap the regulator would then see those changes in supply current but I suspect it would be ideal at high frequency.