My Lm3886 based on BrianGTs Boards

filholder · 28th March 2005, 03:38 PM

Here are the pictures of my build so far.
Should have it all together in the next few days all going well.

filholder · 28th March 2005, 03:39 PM

copper heat sinks

filholder · 28th March 2005, 03:42 PM

Power supply level

filholder · 28th March 2005, 03:45 PM

Amp and PSU

filholder · 28th March 2005, 03:48 PM

Amp and PSu 2

filholder · 28th March 2005, 03:50 PM

One almost finished unit.
They weight a ton well about 4kilos actually.
Cant wait to hear what they sound like

matt20102 · 28th March 2005, 04:09 PM

Looks nice.

I'm at a loss thus far- where are you all getting these transformers from, or do you bite the bullet and pay a fortune for these type of toroids from digikey or mouser?

filholder · 28th March 2005, 04:15 PM

The transfomers are from maplin, like radioshack in the u.k.
They cost £30 for two and are 120VA 22volt.
About as cheap any any i have seen in the u.k. and seem of very good quailty, german made and during testing have been totallly silent.
Seemed like a bargain to me.

G.L. Tirebiter · 28th March 2005, 11:10 PM

Quote:

Originally posted by filholder
One almost finished unit.
They weight a ton well about 4kilos actually.
Cant wait to hear what they sound like

I keep seeing these two-piece heatsink cases. Where is everyone getting them?

filholder · 28th March 2005, 11:50 PM

I cant get them in england but i found i could order them off the
www.conrad.com international website.

the part number is

522970-I5

The build seems pretty good and for the price i have nothing that touches there looks.

Like i said in an ealier post though, getting BrianGT's high cap lm3886 kit in them in a bit of a bugger. The Lm3875 kit seems like it gives much more room. With the Transformer(95cm dia) and PSU board in them there is less than 1cm space front to back. Need to drill pretty acurate.

That why i put in the copper shelf in, partly to reduce interferace and partly cos i need more space. I also though that if i was going to fabricated a shelf come heat sink a copper one would be easier to make since i could do a solder based butt joint. Worked very well but touch a hell of a long time to heat the whole thing up enough for the solder to melt.

Anyway like i said i havent heard them yet but very please with how my first peice of diy audio is going.

fil

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28th March 2005, 04:09 PM	#7
matt20102 diyAudio Member Join Date: Feb 2005 Location: Detroit	Looks nice. I'm at a loss thus far- where are you all getting these transformers from, or do you bite the bullet and pay a fortune for these type of toroids from digikey or mouser?

28th March 2005, 04:15 PM	#8
filholder diyAudio Member Join Date: Jan 2005 Location: london	The transfomers are from maplin, like radioshack in the u.k. They cost £30 for two and are 120VA 22volt. About as cheap any any i have seen in the u.k. and seem of very good quailty, german made and during testing have been totallly silent. Seemed like a bargain to me.

28th March 2005, 11:50 PM	#10
filholder diyAudio Member Join Date: Jan 2005 Location: london	I cant get them in england but i found i could order them off the www.conrad.com international website. the part number is 522970-I5 The build seems pretty good and for the price i have nothing that touches there looks. Like i said in an ealier post though, getting BrianGT's high cap lm3886 kit in them in a bit of a bugger. The Lm3875 kit seems like it gives much more room. With the Transformer(95cm dia) and PSU board in them there is less than 1cm space front to back. Need to drill pretty acurate. That why i put in the copper shelf in, partly to reduce interferace and partly cos i need more space. I also though that if i was going to fabricated a shelf come heat sink a copper one would be easier to make since i could do a solder based butt joint. Worked very well but touch a hell of a long time to heat the whole thing up enough for the solder to melt. Anyway like i said i havent heard them yet but very please with how my first peice of diy audio is going. fil

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