My "audiophile" LM3886 approach

[Russ White]

A note of caution folks. The mods I made have worked great for me, but I did not design this amp, and I am not sure what long term impact the changes I made have on stability or durability and such, so I would not necessarily recommend everyone go and do what I did. If you do it be very careful. I would also like to say that nobody should feel like they will have a substandard amp if they don't modify it. Nothing could be farther from the truth. Seriously just ask the many who have built from Mauro's, Plovati's, or my PCBs and you will see that the My-REF amp as designed is simply one of the best available chipamps period.

Cheers!
Russ

[rudi]

well i promised a friend that will build him a all out amp.

2 x 500VA C-core (good old fashion over kill)
2 x dual 18v 40 VA transformers.
finder relay's
caps to be decided
silver hookup wire.

he is supplying all the bits

seeing that the current configuration is the second best i have ever heard i think it justifies the expence.

just for the fun of it . he is 75years old needs something to make him stop complaining about the amps out there.

this should be finished by the end of next week

[troystg]

Originally posted by Byrd
i was going to say Russ. 300VA . I know we like overkill here but ehm - what level would be reasonable overkill

I will be bringing mine up to test and burn in with 2 100VA toroids (1 per channel) but plan on replacing that with 2 250VA units later on.

The test units are 25 volt (+1 over spec'ed shouldn't hurt the amp) but will likely go to 24 on the final set.

So the qustion is...

What is the optimal size recommended @ 24 volts? 200, 250, 330? I prefer not to WAY over do it.

[Nordic]

Ja nee (yes no)
Typical Gauteng move there...
Use a 3 litre Ford to go get a 2L Coke and a 1L Brandy.
You go boet. Proudly South African and all that.

Here it is the night before christmas. Had confirmation today that my specialy wound transformer will be delivered in the morning, lol, also a bit of overkill rated at 6 Amps... and a small 5V 1A winding for leds and small stuff, only cost about R10 extra.

Tomorrow, tomorrow, I love you tomorrow....

[rudi]

here is some spreading the love. help yourself. but please respect the fact that i do not want commercial versions of this

this is my version

[rudi]

and the components side

you might find some of my ideas about track layout a bit weird but believe me this baby sings

cheers
Rudi

[rudi]

Originally posted by Nordic
Ja nee (yes no)
Typical Gauteng move there...
Use a 3 litre Ford to go get a 2L Coke and a 1L Brandy.
You go boet. Proudly South African and all that.

Here it is the night before christmas. Had confirmation today that my specialy wound transformer will be delivered in the morning, lol, also a bit of overkill rated at 6 Amps... and a small 5V 1A winding for leds and small stuff, only cost about R10 extra.

Tomorrow, tomorrow, I love you tomorrow....

ja boet na so groot zol sal jy 'n groot transformer nodig he om die ore oop te maak

[Nordic]

Sorry boss, but what is the dimensions for that board?
Also do you have a slikscreen for the components?

.... of 'n klomp kleintjies

[rudi]

print it out on A4 and you will be OK

175 x 112

cheers
Rudi

[Russ White]

Originally posted by rabstg



I will be bringing mine up to test and burn in with 2 100VA toroids (1 per channel) but plan on replacing that with 2 250VA units later on.

The test units are 25 volt (+1 over spec'ed shouldn't hurt the amp) but will likely go to 24 on the final set.

So the qustion is...

What is the optimal size recommended @ 24 volts? 200, 250, 330? I prefer not to WAY over do it.

Anything around 150VA or more per channel is just fine.