That is nice so I don't have to disassemble the whole amp to try it.
Thanks for the info.
Maybe a stupid comment but will this problem not be solved using a bigger transformer?
Well, my first diy amplifier long time ago was the LM3875 (Audiosector) it comes with a 10uf cap for power supply. I experimented many values and at the end I kept 10000uf per rail. I remember using Black gate caps on the board (1500uf) and 10000uf on the power supply board. if you just want to "experiment" with more capacitance....just add them at the power supply board. Some people say these Chip-amps sound good with small power supply...and they do!, But the bass is "shy" with small power supply, as soon as you put "hefty" power supply (capacitance) you will "literally" feel the bass. and just to test this, you can use alligator jumpers to disconnect quickly and see the difference that way you do not have to solder/unsolder caps.
Some people will say ,you will "loose" detail in the sound with big power supply...I say, NO WAY!.
no larger transformer will not help here - chip amplifier can "eat" as much as he can before protection will be activated- no more. This is about the ripple filtering. sorry for offt. in picture gallery. here my latest LM3875 - with 4700 + 2200 uf per channel rail. also sounds good.
Attachments
Last edited:
Okay, thanks a lot for the detailed reply and for sure will try it in the near future.
Sound quality is very subjective so it may please me but maybe not.
You are right, this is not the place to discuss this.
Thanks for the info anyway, I have learned a lot from it and will do some experiments to see what I like best.
Talking about LM3886 and capacitance, I have an amplifier made out of 12x LM3886 and 400.000uF. Divide it in two channels. Each channel has a 500VA transformer.
Oh, forgot to say about the sound, this is the best amplifier at high SPL I have ever heard. It provides 300w per channel on 4ohm. Bass is simply georgeous. Don't skimp on capacitance, it's pretty cheap these days.
This for sure is not the reason I did not add capacitance.
Its simply because the amp I've build has been tested with a lots of different capacitance and has been discussed a lots too and the conclusion from quiet a lots of people is that the setup like P. Daniel has made sounds the best.
I maybe will try to add more but until now I'm very satisfied with the setup.
Did you ever try your amp with the same capacitance I use now? who knows it may sound better😀.
FYI, I also use a 500VA transformer but for only 2 LM4780 chips.
Greetz
Last edited:
I've got a question.
At the moment I use Mission M52 speakers.
Some time ago I build different speakers:
Jack's Place - Vifa Basis 95 2.0
At that time I used hafler mono amps and it sounded great.
I wonder if the amp I build now (LM4780 parallel) will be able to drive them with satisfaction.
At the moment I use Mission M52 speakers.
Some time ago I build different speakers:
Jack's Place - Vifa Basis 95 2.0
At that time I used hafler mono amps and it sounded great.
I wonder if the amp I build now (LM4780 parallel) will be able to drive them with satisfaction.
This is one link of many discussions about it.:
http://www.diyaudio.com/forums/chip...t-any-comments-suggestions-16.html#post581230
You are right, I'm sorry, if somebody still want to discuss the capacitance please open a new topic.
for continuing the capacitance discussion please go here: http://www.diyaudio.com/forums/chip-amps/251159-best-capacitance-gainclone.html#post3818465
My first step into DIY audio! Finished it a few hours ago and I'm so pleased right now. It sounds great to me (and I have absolutely no good references before). I was worried about cooling not being enough, cooling grease running to the chip-pins, and noise from power supply, but there is pretty much no hum and it seems (so far) to be cool as well. Soo happy!!
Member
Joined 2009
Paid Member