what toroidal should be used with GC

[messylife]

can someone give me a breakdown of what seems to work the best for cost?

i am pretty new to diy audio and have gotten a pretty good idea about how to constuct my first GC channels, but i am still confused about how to put the PSU together - transformer and diode/recitifer bridges - any info/references would be great

thanks

[JazzzSpazzz]

Not too hard really. Take a look at Decibel dungeon--there is a really good explaination there.

http://www.decdun.fsnet.co.uk/gainclone.html#gcamp

As for which transformer to use--that's your choice! The conventional wisdom for a tranny is 80-100 VA per channel and about 18-25 VAC. There are a lot of choices. A lot of people use toroidals and a lot of people use open frame trannys. I don't know enough to really tell you 1 is better than the other. I am using a 230 VA torodial tranny from Avel Lindberg with dual secondaries of 25 VAC. Of course, stay safe with electricity.

Cheers & good luck,

Bret Morrow

[troystg]

Steve @ apex just got MANY troids for these amps!!

[messylife]

yeah i have been through the decibel dungeon site quite a few times and i came out with a pretty good idea about these things but then i went to go shopping online for the parts i wanted to get and at digikey i got all confused about single, dual primaries, secondaries - all the values and all that jazz. i think i may go with the toroids offered at partsexpress (the 250VA - 25v 25v) it seemed like a nice average to what most people have said they used.

this may be a really stupid question but what is the difference between the signal star ground and the power star ground and i read something about connecting them striaght or with a cap - can anyone explain this concept better to me as i am pretty novice when it comes to electronics (more of a designer). Right now i am assuming i am jut going to bolt the grounds to the chassis. anymore infor would be greatly appreciated. thanks again.

[rampage101]

From what I understand, (this may/may not be correct)
Signal-star ground is all the grounds of the signals tied together, then power-star ground is all the ground from power tied together, this is then joined with a thin wire, which helps reduce noise from entering the signal ground from the power ground. The only thing is I can't tell you which is which.

Look around, there are schematics that show this, on DB Dungeon as well I think.