Gainclone Cool/Cheap Parts Treasure hunt

[BrianGT]

Re: Re: THANK YOU THANK YOU THANK YOU

Specifically, like Variac, I'm using BrianGT's PCB and the inputs doesn't seem to match up at least to me. The 2 hot wires are + and -20 VAC, respectively--how does this connect to a PCB that seems to want 2 neutrals & 2 hots?

I made a couple of posts about this in the other thread. Here is one way to do it with a single bridge:

One ground wire is run to each board from the power supply board.

I haven't tried it yet myself, but it should work.

An alternative is just to use one side of the power supply board (a single bridge), and wire the grounds off the board, tieing one wire from the centertap to each of the amplifier pcb grounds. Make sure to have a capacitor rated high enough for this setup.

--
Brian

 

[Variac]

The trans in post 41 is almost perfect I guess- 4 secondaries, lower voltage, toroid, kinda cheap, If you want no hassles, get one...

Lee wins.

 

[planet10]

I'm not an EE (althou i have credit for the 1st 2 years), but i hope these pictures are clear (and that i have the diodes the right way round)

All are wired for 110V, for 220V the primamries need to be wired in series.

dave
planet10/ eagerly awaiting his kits

 

[planet10]

.

 

[planet10]

The 1st 2 can be made into a centre tap by tieing the "centre" wires together.

 

[Variac]

Dave, The diagrams sre going to end this confusion. Thank You.
I have so points and questions, but will wait till I can also make a diagram

 

[Lee35210]

Planet 10,
It looks like you'll get V+ out of both bridges on the dual sec with 2 bridges schemos you have posted. On the lower bridge you need to swap the V- and 0v = Grounnd labels to get v- out.Circuit is drawn correctly and cap is oriented corectly, just mis-labeled. Might make for unhappy chips other-wise.

Lee35210

 

[planet10]

It looks like you'll get V+ out of both bridges on the dual sec

Thanx for the head's up... actually all 3 had mistakes in them... hopefully i've got them right now.

dave

 

[lieven]

planet10

isn't it better to delete lee35210's intervention (sorry lee), because of possible confusion about the diagrams you allready edited?
people who read this thread synchronically, could misunderstand it and search for flaws who have been corrected allready.

 

[JazzzSpazzz]

Thanks Planet10, BrianGT & all!

That helps a lot! Thanks for the corrected diagrams Plant10. I was most confused on the trannys themselves, I guess--it seemed to me a center tap had the same output as a dual secondary, but I think I got it. So I'm looking for dual 2ndary windings for the easiest connection to Brian's boards. I guess its the Avel 18 + 18 or 25 + 25 from PE for me.

Oh, Brian, I just want you to know that if it weren't for you I would be cursing GT for the St. Joe's game.

Thanks again,
Bret Morrow

 

[Lee35210]

Dave,
I guess senility is playing tricks on me. I just looked at the diagram that applied to my tranny and ignored the other 2.
Thanks for going to the effort to untangle the mental mis-wiring on this subject for everybody..
Going face plate shopping today!

Lee35210

 

[PhilM]

Source for aluminum bar and sheet stock

For those building their own cases, www.onlinemetals.com looks like a good source. They sell several alloys in a variety of sizes. One nice thing is that they offer a range of pre-cut pieces, saving you the cutting charges that industrial distributors charge for less than a whole length/sheet. Their prices seem reasonable, although I haven't checked out their shipping charges.

Phil

 

[AJ Bertelson]

Can anyone tell me the differences between these RCA jacks?

1)the bottom 4 selections
http://sales.goldmine-elec.com/prodlist.asp?move=prev&catid=&frs=1&lrs=31&np=31&fp=11

2)http://www.rpelectronics.com/Defaul...ail=/English/Content/Divisions/Div_24_110.asp

3)http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=090-280

4)http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=090-278

I would like to get a single color RCA jack. Is gold really the best?

 

[Lee35210]

Another metal source

Check to see if you have a Metal Supermarket in your area.

http://www.metalsupermarkets.com/

Great prices and they cut to size. I went yesterday and bought a 1/4 x 4 x 12 and a 1/4 x 4 x4.5 aluminum. Cost was $10.80USD after tax.

 

[widman]

I'm buying aluminum from McMaster Carr . They sell a 1/4" x 3" x 72" bar of 6061 for about $28.00 (p/n 8975K28) and a 1/4" x 4" x 72" bar for about $38.00 (p/n 8975K29). There are also plenty of other options in thickness, width and length.

widman

 

[AJ Bertelson]

Good deal?
http://www.performance-pcs.com/catalog/product_info.php?products_id=784

http://www.bulgin.co.uk/Products/Switches/Illuminated.html

 

[BrianGT]

Good deal?
http://www.performance-pcs.com/catalog/product_info.php?products_id=784

http://www.bulgin.co.uk/Products/Switches/Illuminated.html

The illuminated switch looks nice, but since it is a momentary switch, you will have to find a toggle relay to use with it. It would definately be a nice solution.

--
Brian

 

[JazzzSpazzz]

Cool parts treasure find

Weeelllll, I think it was best said by Dorothy in the Wizard of Oz:

...if I ever go looking for my heart's desire again, I won't look any further than my own backyard.

Avel Lindberg, mfg of fine toroidal transformers, is only about 30 min away from me and, yes, they will sell 1 tranny to me. Also, they are located fairly close to the Homebrew (beer) shop where I need to pick up some supplies anyways. And thanks to Planet10 & BrianGT (& the others who responded) I know which tannies are good for GC & his boards.

Cool, I'm getting there!

Thanks,
Bret Morrow

 

[officeboy]

I'm buying aluminum from McMaster Carr . They sell a 1/4" x 3" x 72" bar of 6061 for about $28.00 (p/n 8975K28) and a 1/4" x 4" x 72" bar for about $38.00 (p/n 8975K29). There are also plenty of other options in thickness, width and length.

widman

You might wanta try http://www.onlinemetals.com that 0.25"x3"x72" aluminum bar is $18.70, plus you can get it in 1,2,3,4,5,6,7, or 8 foot lengths.

 

[RFScheer]

Confirmation of Brian's center-tapped diagram

I wired up my PSU just like Brian shows in post-61 and it works for those of you with center-tapped transformers. Don't know how much of a sonic compromise it is but it sounds good as-is imo.