Post pics of your builds....

[Beefy]

Originally Posted by DaKi][er

That is very much a shorted turn you've created. You should never have anything conductive that creates a loop through the centre of the toroid. Move the grounding wire to anywhere else and you're fine

It's briefly illustrated at the bottom of this page -http://www.bicronusa.com/tpt_designenhancements.html

Yes, I suppose now that I think about it I've essentially added another secondary to the transformer, haven't I? Hooray for decisions made for convenience!

The amp is entirely isolated from the power supply case, so I can't imagine that it is 'hurting' anything..... but I'll fix it as soon as I get home

[EDIT] I was too quick for your edit. The amp has been turned on many times over the past few weeks with it hooked up like that. No problems like I said, because the amp chassis is only grounded through the signal ground.

[Gross]

Originally Posted by DaKi][er

That is very much a shorted turn you've created. You should never have anything conductive that creates a loop through the centre of the toroid. Move the grounding wire to anywhere else and you're fine.

Hmm, this is an issue I havn't seen/encountered before, But it makes sense. Learn something everyday.

[Ferrari]

Good to see that things are cleared up now, after a long sleep . Shorted turn does not necessarily lead to a defect directly.
The result of shorted turn can be quantified as high(er) circulating currents and more heat which can degrading the performance of the tranformer (PS => amp).

[Beefy]

Originally Posted by Ferrari

Good to see that things are cleared up now, after a long sleep

Cheers, Ferrari.

To be honest, I probably don't even need the earth wire at all now. The body of the IEC receptacle/filter is connected to the earth pin, and fairly well connected to the chassis through the mounting screws. I'll check the resistance of the case to ground and see whether I need it, or just drill a hole for a ring terminal.

[Beefy]

I ended up removing that earth wire entirely. There is no resistance between the case and earth, thanks to the way I mounted the IEC receptacle/filter.

Thanks again for the advice, Ferrari and DaKi][er

[EDIT] Removing the earth wire allowed me to move the toroid a couple of centimeters away from the DC power lines. This has reduced the noise floor of the amp quite considerably. Not that there was anything audible below half-volume - let alone with music playing playing - but it is even less now. Such a simple thing.....

[labmat]

Originally Posted by Beefy

Photos of my M^3 and S11, finally, with front and back panels completed.
From the back:

Awesome amps; I love the volume knobs. Just out of curiosity what kind of connectors are those that you used for the power umbilical?

[Beefy]

Originally Posted by labmat

Awesome amps

Thanks labmat!

I love the volume knobs.

They are from eBay Store - PARTSPIPE: SWITCHES, Electronic accessories, Plugs Connectors
The Millett has a 30x22 black aluminium knob, the M^3 has two 24x25 knobs.

Just out of curiosity what kind of connectors are those that you used for the power umbilical?

They are Amphenol Ecomate from Mouser. Pricey, but worth every cent! They are configured so that you can never touch a live wire.....
Socket out of PSU: C016 20G003 100 12
Plug PSU side: C016 20H003 100 12
Plug amp side: C016 20D003 100 12
Socket in to amp: C016 20C003 100 12
The datasheets at Mouser are incorrectly linked. Just remove the '1' after the www to get to the right page.

I have them wired with 3x 17AWG standard hookup wire. Only two of those are actually connected on the sockets, the third is just for strength.

[labmat]

Originally Posted by Beefy

Thanks labmat!
They are Amphenol Ecomate from Mouser. Pricey, but worth every cent! They are configured so that you can never touch a live wire.....
Socket out of PSU: C016 20G003 100 12
Plug PSU side: C016 20H003 100 12
Plug amp side: C016 20D003 100 12
Socket in to amp: C016 20C003 100 12
The datasheets at Mouser are incorrectly linked. Just remove the '1' after the www to get to the right page.

I have them wired with 3x 17AWG standard hookup wire. Only two of those are actually connected on the sockets, the third is just for strength.

Thanks Beefy! I think I going to have to use these on my next project.

[dgbiker1]

Hurray! I just got my Mini^3 faceplates from Front Panel Express! I definitely got a laugh out of the complimentary bag of gummi bears with plate purchase
I apologize for the terrible picture quality, maybe I'll buy a new camera this decade.

[DaKi][er]

Originally Posted by dgbiker1

Hurray! I just got my Mini^3 faceplates from Front Panel Express! I definitely got a laugh out of the complimentary bag of gummi bears with plate purchase

I got the same gummi bears in the panels I ordered, adds a nice personal touch to the company