The Audio Toaster

chicks · 24th November 2011, 03:25 PM

Picked up this Netgear Storage Central box at the Goodwill, thinking it would make a great NAS. It doesn't, it's a proprietary POS. But, in need of a power amp for the Luxman C-1000 pre, I thought it would be cool to do a Class-D build.

I've ordered a TA2022 board from China, and a 44VCT 80VA toroidal tranny from Apex Jr. Figure it's good for ~ 40Wpc, adequate power for my 87db efficiency speakers in a small listening room.

Question for the gurus: I want power it from one of the Luxman's switched power outlets, which of course means non-polarized, non-grounded power cord. I plan to use one of those nylon cord clamps in one of the square holes, an internal fuse, possibly a power switch, then wire to the Toroidal tranny. All connections to be heat-shrink protected. Every precaution to be taken to avoid the slightest possibility of a live wire shorting to the case. Am I nuts? Should I use a three-wire power cord, and just switch the thing separately?

theAnonymous1 · 24th November 2011, 04:02 PM

I'm not going to tell you one way or the other, but I would personally be OK with no ground. Proceed at your own risk.

BTW, I would change out the bobbin inductors on that amp board. They are the wrong value; try to fit some ~11uH toroids in their place.

luka · 24th November 2011, 04:23 PM

Quote:

Originally Posted by chicks

Picked up this Netgear Storage Central box at the Goodwill, thinking it would make a great NAS. It doesn't, it's a proprietary POS. But, in need of a power amp for the Luxman C-1000 pre, I thought it would be cool to do a Class-D build.

I've ordered a TA2022 board from China, and a 44VCT 80VA toroidal tranny from Apex Jr. Figure it's good for ~ 40Wpc, adequate power for my 87db efficiency speakers in a small listening room.

Question for the gurus: I want power it from one of the Luxman's switched power outlets, which of course means non-polarized, non-grounded power cord. I plan to use one of those nylon cord clamps in one of the square holes, an internal fuse, possibly a power switch, then wire to the Toroidal tranny. All connections to be heat-shrink protected. Every precaution to be taken to avoid the slightest possibility of a live wire shorting to the case. Am I nuts? Should I use a three-wire power cord, and just switch the thing separately?

All my life I live without ground, since in this building we don't have it, and I am still here

As long as you won't tuch the amp and some grounded part, you will be safe as with it

Campino Morten · 24th November 2011, 05:53 PM

If you want to be on the safe side, you can do it the way it is normally done with a non grounded electrical appliance in a metal housing, make it double insulated (class 2 product).
That means that you have two (or one reinforced) layers of insulation between live parts and the metal housing.

chicks · 25th November 2011, 08:01 PM

Good idea, maybe I'll line the insides with some of that self-stick vinyl shelf liner...

Speedskater · 27th November 2011, 03:05 PM

Get a cheater plug adapter, connect it at the Luxman's switched power outlets.
Then run a separate Safety Ground wire from the adapter to the Luxman's chassis or to the power outlet.

Double insulated (class 2 product) are not for amateurs!

redjr · 5th February 2012, 04:24 PM

Hey chicks,

Friend from over on AK. Always enjoy your GW/SA finds. Lucked out myself yesterday with a pair of large Advents(bad shape though) for $15. Lots of work!

Anyway... Curious how your DIY toaster T-amp project is coming along. I have one of those Netgear enclosures myself and have had nothing but trouble with it. Gave up on it years ago. Have since upgraded to their ReadyNAS Duo. Great idea to re-purpose the case for a small amp. Got any pictures?

Keep us posted.

jonfrason · 10th February 2012, 08:25 PM

Quote:

Originally Posted by theAnonymous1

I'm not going to tell you one way or the other, but I would personally be OK with no ground. Proceed at your own risk.

BTW, I would change out the bobbin inductors on that amp board. They are the wrong value; try to fit some ~11uH toroids in their place.

Is that the reason the inductors on this board get so hot?
Can't hold on them long before it hurts.
Also 7805 regulator is hot. Regulator has a resistor to limit the voltage on my board, but piture in this thread shows a zener diode?
Anyways, cant seem to find much info on this particular board.

Jon

boone · 11th February 2012, 03:41 PM

Ha - You call that an audio toaster?

jonfrason · 12th February 2012, 09:44 AM

very nice indeed!

24th November 2011, 03:25 PM	#1
chicks diyAudio Member Join Date: Sep 2008	The Audio Toaster Picked up this Netgear Storage Central box at the Goodwill, thinking it would make a great NAS. It doesn't, it's a proprietary POS. But, in need of a power amp for the Luxman C-1000 pre, I thought it would be cool to do a Class-D build. I've ordered a TA2022 board from China, and a 44VCT 80VA toroidal tranny from Apex Jr. Figure it's good for ~ 40Wpc, adequate power for my 87db efficiency speakers in a small listening room. Question for the gurus: I want power it from one of the Luxman's switched power outlets, which of course means non-polarized, non-grounded power cord. I plan to use one of those nylon cord clamps in one of the square holes, an internal fuse, possibly a power switch, then wire to the Toroidal tranny. All connections to be heat-shrink protected. Every precaution to be taken to avoid the slightest possibility of a live wire shorting to the case. Am I nuts? Should I use a three-wire power cord, and just switch the thing separately?

24th November 2011, 04:02 PM	#2
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	I'm not going to tell you one way or the other, but I would personally be OK with no ground. Proceed at your own risk. BTW, I would change out the bobbin inductors on that amp board. They are the wrong value; try to fit some ~11uH toroids in their place. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

27th November 2011, 03:05 PM	#6
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	Get a cheater plug adapter, connect it at the Luxman's switched power outlets. Then run a separate Safety Ground wire from the adapter to the Luxman's chassis or to the power outlet. Double insulated (class 2 product) are not for amateurs! __________________ Kevin

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24th November 2011, 05:53 PM	#4
Campino Morten diyAudio Member Join Date: Jul 2011	If you want to be on the safe side, you can do it the way it is normally done with a non grounded electrical appliance in a metal housing, make it double insulated (class 2 product). That means that you have two (or one reinforced) layers of insulation between live parts and the metal housing.

25th November 2011, 08:01 PM	#5
chicks diyAudio Member Join Date: Sep 2008	Good idea, maybe I'll line the insides with some of that self-stick vinyl shelf liner...

5th February 2012, 04:24 PM	#7
redjr diyAudio Member Join Date: May 2011 Location: Upstate, NY	Hey chicks, Friend from over on AK. Always enjoy your GW/SA finds. Lucked out myself yesterday with a pair of large Advents(bad shape though) for $15. Lots of work! Anyway... Curious how your DIY toaster T-amp project is coming along. I have one of those Netgear enclosures myself and have had nothing but trouble with it. Gave up on it years ago. Have since upgraded to their ReadyNAS Duo. Great idea to re-purpose the case for a small amp. Got any pictures? Keep us posted.

12th February 2012, 09:44 AM	#10
jonfrason diyAudio Member Join Date: Nov 2011	very nice indeed!

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