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-   -   Finally, almost done with first IGC (http://www.diyaudio.com/forums/chip-amps/27547-finally-almost-done-first-igc.html)

officeboy 4th February 2004 04:25 PM

Finally, almost done with first IGC
 
Wow, it sure took a lot longer then I had planned. Actually making the circuit was pretty fast, it's making a case and having it all look nice that is taking me so long.

I wanta say thanks to all in here for your help, your pictures, and your very handy websites.

http://home.comcast.net/~0fficeboy/amp1/index.html

So basic specs are; inverted LM3875 design from http://ampchipdiy.com/invertedLM3875_r2_1.gif. and dual 18V surplus trannys paralleled after rectifiers.
Still to be done is to final sand and poly coat the wood for the faces, drill my super fancy hole for blue LED on power unit. Brush and alodine the 4x4 tube for power unit, maybe add some venting holes. And some screws through the bottom to hold the transformers down in case things get tipped on their side. Also I need to get some feet for the Amp case, I have a 3/4" rod of brass that Iíd like to get turned into some spikes, but I need to get some time on the lathe at a friends machine shop, so that might still be a few weeks, or months.

officeboy 4th February 2004 05:26 PM

Sorry for the blurry pictures.http://home.comcast.net/~0fficeboy/a...s/DSCF0149.JPG

toque_101 4th February 2004 08:10 PM

so.... how does it sound? :D

looks good btw

what specific components did you use (resistor types, coupling cap, etc)?

officeboy 11th February 2004 04:24 PM

2 Attachment(s)
Getting close now. :D
All I need are to mount the blue LED in the face panel of the power unit, and get some nice feet for the amp side. Although I may refinish the cases, itís so hard to get that alodine to look even.

As to components toque_101, All resistors by Riken and feedback by Caddok . Input cap is a Blackgate N. Power caps are all some brand that Partsexpress carries.
And it seems to sound pretty good. I have a buddy who just finished a new tube amp, and preamp and I'll be heading over there soon to do some testing/comparison.

As to my first impressions, it sounds hmm, fast? And seems to have a bit more bass then well my crappy Teac receiver. But with the way things are setup right now, and my lack of experience.. itís just really hard to tell.


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