Hello guy´s!!!
I have been reading this article:
www.tnt-audio.com/clinica/ssps1_e.html and I have a big doubt.
What´s happens if I use a 6800 uF in a chip amp´s based in LM3886? Why did you use, almost always, a 1000uf in PSU?
Thanks for your answers.🙂
Greetings,
Marcelo
I have been reading this article:
www.tnt-audio.com/clinica/ssps1_e.html and I have a big doubt.
What´s happens if I use a 6800 uF in a chip amp´s based in LM3886? Why did you use, almost always, a 1000uf in PSU?Thanks for your answers.🙂
Greetings,
Marcelo
It's so easy for you to try it yourself; you'll either love it or hate it. There are no real technical reasons for the preference
Hi,
Yes and no...naturally what you prefer is ultimately your business.
Technically though any engineer would argue against too small PSU capacitance...I know I would.
Less capacitance will sound faster at the expense of sustained bass response. Low frequencies tend to drain PSU heavily.
So, it's well worth trying out what suits your system best acccording to your taste in music etc.
Peter,
If you ever experimented with the size of cathode bypass caps you'll have noticed the phenomenon at work already...
Remember that phono stage, well it's a preamp alright, I post some time ago?
Those cathode decouplings caps drove me nuts...going from a calculated 47µF polyester cap through tantalum caps 10 times that value to even thousands of µFs altered the perceived bass response yet also invariably seemed to affect transient response for the worst.
Truly mindboggling...
Maybe lots of very fast caps in the PSU is the answer?
Cheers,😉
Yes and no...naturally what you prefer is ultimately your business.
Technically though any engineer would argue against too small PSU capacitance...I know I would.
Less capacitance will sound faster at the expense of sustained bass response. Low frequencies tend to drain PSU heavily.
So, it's well worth trying out what suits your system best acccording to your taste in music etc.
Peter,
If you ever experimented with the size of cathode bypass caps you'll have noticed the phenomenon at work already...
Remember that phono stage, well it's a preamp alright, I post some time ago?
Those cathode decouplings caps drove me nuts...going from a calculated 47µF polyester cap through tantalum caps 10 times that value to even thousands of µFs altered the perceived bass response yet also invariably seemed to affect transient response for the worst.
Truly mindboggling...
Maybe lots of very fast caps in the PSU is the answer?
Cheers,😉
Frank
Every particular case has to be judged on its own merits. Excessive capacitance in a phono stage, especially in a cathode bypass sounds different. Believe it or not, i lived for years with a phono which used 3300uF in the PS and didn't sound any the worse for it.
The GC, otoh, is disproportionately sensitive to the amount of PS capacitance; you exceed a certain limit and all the outstanding 'GC' qualities go. And yes, it then copes better with sustained bass notes, but what a price to pay.
cheers
peter
Every particular case has to be judged on its own merits. Excessive capacitance in a phono stage, especially in a cathode bypass sounds different. Believe it or not, i lived for years with a phono which used 3300uF in the PS and didn't sound any the worse for it.
The GC, otoh, is disproportionately sensitive to the amount of PS capacitance; you exceed a certain limit and all the outstanding 'GC' qualities go. And yes, it then copes better with sustained bass notes, but what a price to pay.
cheers
peter
Considering recommended maximum ripple voltage for the amp, I would decide the size of PSU caps based on:
:yingyang:
- Ripple voltage = I (load)/fC (Half wave)
- Ripple voltage = I (load)/2fC (Full wave)
:yingyang:
If we're talking about the inverted series of LM based gainclones, the consensus of experience seems to indicate a cap between 560-2200uF per channel is your best bet with lower impedence loads requiring the higher number.
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