Just finished my very first Amp!

NINfan · 18th November 2005, 04:59 AM

Some pics for you

http://img9.imageshack.us/my.php?image=amp87vq.jpg

http://img275.imageshack.us/my.php?image=amp0159rw.jpg
(It's a mess, I know)

http://img60.imageshack.us/my.php?image=amp0ms.jpg

It's an lm3886 amplifier, I got it from chipamp.com, one of Brians. It sounds amazing, and I'm shocked that this sounds better then my dads $600 home theatre receiver. That heatsink is a bit tiny, but I'm not pushing the amp to hard so it works.

Nordic · 18th November 2005, 05:29 AM

Nice going there....

Why not extend one of the LEDs with some wire and put it through the faceplate?

How did you manage to dril holes through the PC heatsink?

NINfan · 18th November 2005, 05:32 AM

That was a real challange dude, the holes are really short, but deep enough to hold the screw and the bolt in place. I just used a regular screw driver, it took alot of force, and I even lost 1 bit. I am thinking about pulling out that power LED, thanks.

Nordic · 18th November 2005, 05:49 AM

While you are at it, I would move the power button to the front too, unless you plan to mostly leave the amp on... It gets inconvenient very quickly to have to feel around the back for a switch... I love the colour on that case too... looks so clean.

NINfan · 18th November 2005, 06:00 AM

Funny that you say that, originally I really wanted that power switch in the front, but with the toroid in place along with the rectifier board I did'nt have enough room for it, so I had to put it in the back. I could reposition the toroid, and rectifier, but with all that wire in place I just think it would be real inconveniant. Guess I'll have to think in advance before the next project. That's a really small case, and orienting things was hard, but in the end I like my amp small. Oh btw, thanks for the compliment, it's a hmmond chassis made of plastic.

Nordic · 18th November 2005, 06:10 AM

I think you can pull it off if you move the toroid an inch or so to the back (where the switch used to be, lol).

fedde · 18th November 2005, 04:17 PM

Nice small amplifier box. I'd advise to put some isolation over the mains connections! If one of the 110/230V wires gets loose it might touch the speaker connectors. Use some shrinking housings (don't know the english name, we would say krimpkous here

).

Fedde

Nordic · 18th November 2005, 04:46 PM

Which in my homelanguage translates as "shrink socks".

youyoung21147 · 18th November 2005, 04:54 PM

Nice !

The PSU caps look "heavy duty". Did you use a snuberized PSU ?

Also, maybe if you get some hisss or hum noise, you can twist the input wires to shield them from EMI/RFI. Their path is quite long from the input to the pot and to the amps.

Mick_F · 18th November 2005, 07:15 PM

Quote:

Originally posted by fedde
Nice small amplifier box. I'd advise to put some isolation over the mains connections! If one of the 110/230V wires gets loose it might touch the speaker connectors. Use some shrinking housings (don't know the english name, we would say krimpkous here ).

Fedde

Het heet "heatshrink" in het Engels, Fedde

Mick

18th November 2005, 04:59 AM	#1
NINfan diyAudio Member Join Date: Jun 2005 Location: mem	Just finished my very first Amp! Some pics for you http://img9.imageshack.us/my.php?image=amp87vq.jpg http://img275.imageshack.us/my.php?image=amp0159rw.jpg (It's a mess, I know) http://img60.imageshack.us/my.php?image=amp0ms.jpg It's an lm3886 amplifier, I got it from chipamp.com, one of Brians. It sounds amazing, and I'm shocked that this sounds better then my dads $600 home theatre receiver. That heatsink is a bit tiny, but I'm not pushing the amp to hard so it works.

18th November 2005, 04:17 PM	#7
fedde diyAudio Member Join Date: Jul 2002 Location: Eindhoven, the Netherlands	Nice small amplifier box. I'd advise to put some isolation over the mains connections! If one of the 110/230V wires gets loose it might touch the speaker connectors. Use some shrinking housings (don't know the english name, we would say krimpkous here ). Fedde __________________ http://www.fedde.nu, gainclone and non-oversampling DAC audio projects and kits...

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18th November 2005, 05:29 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	Nice going there.... Why not extend one of the LEDs with some wire and put it through the faceplate? How did you manage to dril holes through the PC heatsink?

18th November 2005, 05:32 AM	#3
NINfan diyAudio Member Join Date: Jun 2005 Location: mem	That was a real challange dude, the holes are really short, but deep enough to hold the screw and the bolt in place. I just used a regular screw driver, it took alot of force, and I even lost 1 bit. I am thinking about pulling out that power LED, thanks.

18th November 2005, 05:49 AM	#4
Nordic diyAudio Member Join Date: Sep 2005	While you are at it, I would move the power button to the front too, unless you plan to mostly leave the amp on... It gets inconvenient very quickly to have to feel around the back for a switch... I love the colour on that case too... looks so clean.

18th November 2005, 06:00 AM	#5
NINfan diyAudio Member Join Date: Jun 2005 Location: mem	Funny that you say that, originally I really wanted that power switch in the front, but with the toroid in place along with the rectifier board I did'nt have enough room for it, so I had to put it in the back. I could reposition the toroid, and rectifier, but with all that wire in place I just think it would be real inconveniant. Guess I'll have to think in advance before the next project. That's a really small case, and orienting things was hard, but in the end I like my amp small. Oh btw, thanks for the compliment, it's a hmmond chassis made of plastic.

18th November 2005, 06:10 AM	#6
Nordic diyAudio Member Join Date: Sep 2005	I think you can pull it off if you move the toroid an inch or so to the back (where the switch used to be, lol).

18th November 2005, 04:46 PM	#8
Nordic diyAudio Member Join Date: Sep 2005	Which in my homelanguage translates as "shrink socks".

18th November 2005, 04:54 PM	#9
youyoung21147 diyAudio Member Join Date: Apr 2005 Location: Belfort	Nice ! The PSU caps look "heavy duty". Did you use a snuberized PSU ? Also, maybe if you get some hisss or hum noise, you can twist the input wires to shield them from EMI/RFI. Their path is quite long from the input to the pot and to the amps.

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