LM338 regulated snubberized PSU for audio amplifiers

[AR2]

What about class A amps? How this apply to them? What capacitance to use behind the regulator in lets say Aleph 30 or Aleph 5 situation?

[carlosfm]

Originally posted by grege
From my point of view, the regulated supply has a permanent 8 volt voltage drop which is probably greater than that of the unregulated PSU.

I meant the voltage drop on the chip's pins, on the amp.
On an unregulated PSU that is modulated with the music, depending on how much current the amp is asking from the PSU.

[carlosfm]

Originally posted by AR2
What about class A amps? How this apply to them? What capacitance to use behind the regulator in lets say Aleph 30 or Aleph 5 situation?

You don't need more than 10,000uf before the reg.

[Greg Erskine]

Originally posted by carlosfm
I meant the voltage drop on the chip's pins, on the amp.
On an unregulated PSU that is modulated with the music, depending on how much current the amp is asking from the PSU.

I understood what you meant, I was just trying to say that to achieve a sag free PSU, we have to add a regulator that permanently drops, in this case 8 volts. The power used by the regulator is not avaliable to the amp. That's all.

[homer09]

Originally posted by grege


I understood what you meant, I was just trying to say that to achieve a sag free PSU, we have to add a regulator that permanently drops, in this case 8 volts. The power used by the regulator is not avaliable to the amp. That's all.

i think logically, less regulated power is better than more but sagging power.

also, chips have a voltage limit, so if you like listening to them at say 32 volts, use a 40V trafo regulated down to 32. so in this case, yes those extra 8 volts are not available, but you dont want them to be anyway.

but i see what you mean if you are using the same trafo for both situations.

[carlosfm]

Originally posted by homer09
also, chips have a voltage limit, so if you like listening to them at say 32 volts, use a 40V trafo regulated down to 32.

[homer09]

Originally posted by carlosfm

haha, i know these are way to high for LM series chips. i just pulled numbers out of the air. no need for fire warnings!

[carlosfm]

Originally posted by homer09
haha, i know these are way to high for LM series chips. i just pulled numbers out of the air. no need for fire warnings!

Didn't you find out yet?
With a 40V trafo you will get 56V

[Upupa Epops]

I wasn't a few days here, but I see - neverending story .

[Franz G]

I wish, you still have a happy and sunny sunday, regardless of neverending stories

Kind regards
Franz