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-   -   EASY diy gainclone ??? (http://www.diyaudio.com/forums/chip-amps/15724-easy-diy-gainclone.html)

adharvey 28th May 2003 01:02 AM

EASY diy gainclone ???
 
I'd like to build a gainclone...


Where would I find a site for newbies. (perhaps there is tooo much info :( )

I'm looking for a hand-holding guide; any ideas where ?

Thanks in advance, I think this forum idea is excellent.

Adam
Gold Coast, Australia

Music Machine 28th May 2003 08:59 AM

There is a lot of info on the web and it can be a little tough to sort through.
For a basic clone with clear schematics and parts list try this link.

http://www.geocities.com/rjm003.geo/...io/diy_gc.html

Good luck

Nuuk 28th May 2003 01:34 PM

I'll let my Gainclone page speak for me.

fedde 28th May 2003 02:06 PM

Or have a look at my site ;)

It's the original Thorsten clone with quite some of info to build one...

www.fedde.tk

Fedde

Shoog 28th May 2003 06:04 PM

I tried this
 
I tried building a single supply gainclone from scratch but had a few chips blow up and I couldnt get rid of the hum. I amtherefore trying Rod Elliots project. Still in the construction stage, but I am confident.

http://sound.westhost.com/project72.htm

fedde 28th May 2003 08:48 PM

If you follow my recommendations precisely and do not play music at ear-bleeding levels you theoretically will not kill any LM chips... ;)

Fedde

SRMC 28th May 2003 09:11 PM

It is easier than you think. . .
 
Go for it. I have no formal electronics training and instead read an intro to electronics book. With my minimal knowledge it was relatively easy to build. I encourage you to follow Thorsten's inverted schematic as I did. I am very pleased with my results, but I did have a couple of setbacks along the way. The first mistake I made was installing the capacitor on the V- rail backward, which promptly exploded electrolytic goo into the bottom of my amp case (no Variac to test things out first). With that problem fixed I had one happily running channel.

On the second channel I fried one chip before I realized my mistake. I used the uninsulated LM3875, and although I was using a mica insulator, a burr on the case was shorting out the back of the chip. After deburring the case and soldering in a new chip I had a fully functional (and very nice sounding) amplifier.

Just take your time and you'll do just fine. After you gather all of the parts, familiarize yourself with them, and look at some of the layouts people have used. After you're done, take a break and quadruple check your wiring. It may seem intimidating, I'd bet once you try it yourself you be hooked.

Thor Amp page (not mine)

fedde 28th May 2003 09:29 PM

Yep, I managed to fry a resistor and cap by making that mistake. Always measure the resistance between the opamp case and the heatsink before power on !!! If it's zero then something is very wrong :rolleyes:

Fedde

fedde 28th May 2003 09:31 PM

Re: It is easier than you think. . .
 
Quote:

Originally posted by SRMC
Thor Amp page (not mine)
That's the one. And don't forget the second page:
http://home.student.utwente.nl/f.s.b...-thor-amp.html

All are reachable from www.fedde.tk :nod:

Fedde

pinkmouse 28th May 2003 09:35 PM

Fedde

Why don't you put your site address in your profile, (look under user cp), then it's always there as a button at the bottom of your posts?;)


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