Gainclone building thread based on BrianGT's boards

[meat]

I haven't started building my Gainclone amp yet, but since others have, I figured I would start a new thread where people can discuss the building process or ask questions, rather than fill up the group buy thread. So post away!

[tg3]

Can't build anything until my Cardas group order comes in...

[BrianGT]

Originally posted by tg3
Can't build anything until my Cardas group order comes in...

That is what I said about my Aleph projects... and the Cardas posts came in, and are still sitting on the shelf.

I also have piles of heatsinks scattered all over my apartment... (8+8+4+4=24 heatsinks waiting to be used)

If anyone hasn't seen my gainclone build pictures, please visit my gallery:
http://brian.darg.net/gallery/nigc-kit
It should be fairly thorough. These pictures will be in the manual, along with schematics and descriptions.

Sorry for the delay in the manual, but I am still working hard to get all the kits done. Hopefully I should get most of the remaining kits done tonight and ready for Meredith to start shipping out tommorrow.

--
Brian

[Saurav]

What's a rough guideline for the fuse rating to use? I have a 250VA 25-0-25 transformer. I'm assuming I should get a slo-blo, since it's a toroid?

[speaker]

Originally posted by BrianGT



If anyone hasn't seen my gainclone build pictures, please visit my gallery:
http://brian.darg.net/gallery/nigc-kit
It should be fairly thorough. These pictures will be in the manual, along with schematics and descriptions.

Sorry for the delay in the manual, but I am still working hard to get all the kits done. Hopefully I should get most of the remaining kits done tonight and ready for Meredith to start shipping out tommorrow.

--
Brian

Brian:

Excuse the n00b q, Why is the precision resistor snugged up to the LM3875?

speaker

[meat]

Excuse the n00b q, Why is the precision resistor snugged up to the LM3875?

I believe he said that it was very important that they be as close as possible. There are 2 ways you can do it. You can solder it as shown, or solder it to the ends of those pins on the bottom side of the board.

There is more information on the top of this thread

Group order of non-inverted LM3875 pc boards? Anyone interested?

[BrianGT]

Originally posted by speaker
Brian:

Excuse the n00b q, Why is the precision resistor snugged up to the LM3875?

The resistor is the negative feedback resistor. In order to obtain the best performance from the LM3875, the feedback look must be as short as possible. This component has the most effect on the amplifier's performance.

This resistor can be soldered right in front of the lm3875, or on the bottom side of the pcb.

--
Brian

[Saurav]

Can anyone answer my fuse question please?

[vsr123]

I think a 1.5A to 2A fuse should be enough. Not sure if you need a slow blow type though since the inrush current should be small. If you read other threads the general comment is to keep trying different fuses until they stop blowing! :-)

cheers
vsr

[Saurav]

Thanks. That's about what I was thinking.

keep trying different fuses until they stop blowing

That's a nice scientific way to approach the problem