my 2x LM3886 in parallel amp finished

[alexw88]

Just finished



More photos and details at http://www.shine7.com/audio/pa100.htm

[peranders]

Nice work.

Feel free to join my exclusive webring for Gainclones.

http://C.webring.com/hub?ring=gaincloneamplifi

Scott Nixon, if you read this, feel free to join me too. 29000 hits the short time I have had the ring. Free of charge of course.

Guess which web site is the most popular?

[demogorgon]

looks very good indeed!

good going for someone 16 years old i must say!
(if then the "88" stands for your birth year.. if not, well, still nicely done)

[alexw88]

16!

I was 16 years old 16 years ago.

[Sandy H.]

I like the layout and thorough job you did with both design and implementation. The pictures and comments are also very helpful. I will use your page as a guide when I am trying to think out the layout of a future project.

Thanks for the post.

Sandy.

[peranders]

Originally posted by alexw88
16!

I was 16 years old 16 years ago.

You are in my webring now. Welcome!

[demogorgon]

Originally posted by alexw88
16!

I was 16 years old 16 years ago.

well, it did look a bit to well made and thought out for somone a year younger than me

nothing negative intended!

and again: very nice vork

btw: i see there is no pot meter, wich implies the notion that this is a power amp. a power amp must have a preamp of course, and so i wonder how you went forward to match the impedans of the power amp with the impedans of the pre amp?

my teatcher did tell me a lite about this thing, i dont rememberwhat he calles the circut , but i remember he told me just enough for me to have tons of questions about the subject..

so if you could helt me out, i would realy be grateful!

regards
marius

[alexw88]

Thanks for your comments

I hope my page can be useful for those who want to build a parallel 3886 amp., I won't call it a GC because it uses more components, which voilate the GC concept. However those "extra" components are added for stability and for eliminating all the RF interference.

Originally posted by peranders

You are in my webring now. Welcome!

Thanks, your webring is very helpful to all the Gaincloners!

Originally posted by demogorgon


btw: i see there is no pot meter, wich implies the notion that this is a power amp. a power amp must have a preamp of course, and so i wonder how you went forward to match the impedans of the power amp with the impedans of the pre amp?

Yes, it is a power amp, and its input impedence is about 47k, which is set by the resistor before the input of 3886. I think 47k is high enough for any pre-amp.

I am using a passive preamp now, so it is actually my DAC driving the amp.

[Scribble]

Can the schematic on your webpage be modified to accomidate the LM3875 IC?

[demogorgon]

Originally posted by alexw88
Yes, it is a power amp, and its input impedence is about 47k, which is set by the resistor before the input of 3886. I think 47k is high enough for any pre-amp.

but when using a fixed resistor of 47k ohms, it's not impedans(Z), it's resistance(R).. Is it the resistor paralelled with a condensator that makes the fixed resistance(R) into impedance (Z)?

I strongly suspect that i should have paid better atension in class..

(Edvard Grieg - Peer Gynt suiten - morgen stemning)
wonderful classical music, really astounding!