My New Gainclone

[rampage101]

After my first humble attempt, I decided it was time for a clean up and rewire, also to try and get rid of ground hum.

[wintermute]

looking good rampage have you suceeded in fixing the hum problem??

Tony.

[Crazy-Stereo]

Can you tell us your result after clean up? and more pics.

[rampage101]

Well, the pictures above are actually of my latest incarnation. From my little tests it appears the hum is gone, but I can't be certain until I completly wire it all.

My last approach used a piece of laminated masonite as a pcb, and just drilled holes and did p2p type joining on the back of the board. My grounds all went to the one location and was quite possibly the reason for hum and noise.

Now, I decided on a 3mm Angle alloy strip, drill some holes, mount all components and then wire p2p. I wired all signal grounds to input ground, then joined that to power ground point. I've only tested 1 channel so far, as I don't have a working mult-meter at home I'll take both my old amp (integrated with ESP HiFi diy preamp kit, 300va (18-0-18-0) toroid, which gives me 25v-26v rails.

So as yet, I have no idea on dc-offset or anything else, just that from preliminary testing on 1 channel before completion it seemed better

I had to use the paper on the banana posts as I didn't have any insulation washers or anything, so I used some clear tape to insulate some of the shaft and then paper for washers. I need to check for continuity though before further testing.

[wintermute]

Hi Rampage,

I'm using these http://www.jaycar.com.au/productView...Max=&SUBCATID= from jaycar. they come with insulation washers. Make sure if you get washers you get ones that go inside the hole as well (sort of stepped) so that they stop the bolt from touching if you don't center it properly

edit: notice you use insulation tape on the shaft, I guess a bit of heat shrink would work too

Tony.

[rampage101]

Hey Tony,

Thanks for the link. The ones I'm using must be for wooden speaker boxes or something. I was going to just use heatshrink for insulation around the shaft, but the only stuff I had handy was a tiny bit too small to get over the shaft.

Anyways, I'll get this thing checked with a multimeter.

[rampage101]

Problems, the amp is working, but I'm getting very uneven volume level from each chip. I can't see anything wrong, all resistors seem to be in the correct place.

Ideas?

[Upupa Epops]

... looking good.... realy ?

[wintermute]

Had you finished soldering in the pics you posted rampage?? the connection on the right channel rca doesn't appear to be soldered

Tony.

[wintermute]

Originally posted by Upupa Epops
... looking good.... realy ?

compared to some of the stuff I posted in the ugly amp and ugly prototype threads definitely

Tony.