EASY diy gainclone ???

adharvey · 28th May 2003, 01:02 AM

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 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

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

Fedde

fedde · 28th May 2003, 09:31 PM

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

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?

28th May 2003, 01:02 AM	#1
adharvey diyAudio Member Join Date: May 2003 Location: Thursday Island, Torres Strait (still Queensland), Australia	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

28th May 2003, 01:34 PM	#3
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	I'll let my Gainclone page speak for me. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

28th May 2003, 06:04 PM	#5
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	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

28th May 2003, 09:11 PM	#7
SRMC diyAudio Member Join Date: Sep 2002 Location: Sacramento, California	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) __________________ SRMC

28th May 2003, 09:35 PM	#10
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	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? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort


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28th May 2003, 08:59 AM	#2
Music Machine diyAudio Member Join Date: Oct 2002 Location: California	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

28th May 2003, 02:06 PM	#4
fedde diyAudio Member Join Date: Jul 2002 Location: Eindhoven, the Netherlands	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

28th May 2003, 08:48 PM	#6
fedde diyAudio Member Join Date: Jul 2002 Location: Eindhoven, the Netherlands	If you follow my recommendations precisely and do not play music at ear-bleeding levels you theoretically will not kill any LM chips... Fedde

28th May 2003, 09:29 PM	#8
fedde diyAudio Member Join Date: Jul 2002 Location: Eindhoven, the Netherlands	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 Fedde

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