CurtPalme.com Home Theater Forum

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Got my Two Heat sinks in today. I have partial Board made up and think I'll place it on the heat sink
as so.

The Fins will face up and the Component side of the PCB will be upside down in the chassis.

I could put the board perpendicular on the heat sink but then I'll loose space in the chassis
for the two other boards. Perpendicular would dissipate the heat more evenly over the Heat sink,
but Again I'll loose chassis space.

I might actually have to cut the top away where the heat sink fins come out over the top
of the Chassis. Which I think I'd prefer. The logistics for fixing them to the chassis will come later.

If this chassis wont work I will get another and save this for another Project.

Athansios

CxTurbo · Joined: 13 Oct 2008 Posts: 425 Location: Ontario, Canada

Nash,

Those look a lot beefier then the other ones you had that is for sure.

I need to finish up with all this Marquee business before I get going on mine.

James

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

CxTurbo · Joined: 13 Oct 2008 Posts: 425 Location: Ontario, Canada

Looks like they have plenty of surface area for heat dissipation.

I know guys on DIYAUDIO are using heat sinks from him for Aleph clones and all kinds of PASSDIY projects. You should see the huge sinks they use for four output devices per channel. 4RU chassis with massive Toroids big cap banks and the sinks are as tall and long as the side of the case per side.........

Want to build some Mono's one day. Along with a set of Mono tube amps tube, phono stage and the list goes on LOL!

This looks like a bunch of fun though.

James

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

The price wasn't bad either compared to AVID directly. These were 2.35 per inch.

Nashou

**kal** · Posted: Mon Feb 04, 2013 11:12 pm Post subject:

HK-Steve · Posted: Tue Feb 05, 2013 7:11 am Post subject:

Nashou,
Those look like the same heatsinks I put on my Marquee.

Cheers

HK-Steve · Posted: Tue Feb 05, 2013 7:58 pm Post subject:

Nashou,
I thought you were going to keep the heatsinks seperate from each other, not one large one?

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

HK-Steve · Posted: Tue Feb 05, 2013 9:05 pm Post subject:

Yes, Max was 3.05amps,
minimum as 1.48amps,

I rounded my original to 1.5 and 3amps.

But interesting, the heat dissipation is very high with the Singma design.

Why is it that the Wallwart and replacement laptop style have such small heatsinks??????

Better regulation of the voltage? and less noise??

Looks like some scope time.........

Cheers

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Because the Sigma is not a SMPS I would assume. those can regulate voltage with less heat. The sigma is a clean noiseless PS.

Athanasios

HK-Steve · Posted: Tue Feb 05, 2013 9:08 pm Post subject:

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Well I got it on the heat sink. Taped the holes and two holes for the stand off. I'll have to figure out what to do for the other
half where the stand offs are off the heat sink.

But I have a problem where I am suppose to get a reading off two resistors near the Mosfet . They read under 1 volt and should read near 7, but this is whats weird if i swap the lead of my multimeter so I put the ground to positive I get a over 5 volt reading.

the Output is at 5.8 volts and measures the correct phase of positive then negative if I swap leads.

I posted on the AMG forum so we'll see what they say.

swell here is the schematic if anyone wants to try to help here Wink

Link to operating voltages test points.
http://www.amb.org/audio/sigma11/s11_5v_voltages.pdf

thanks Guys!!

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

You wont believe what it was. Partsconnexion sent me the wrong resistors for R4 and R5. they are suppose to be 100 Ohm's
they sent me 100 Kohms and I never noticed till I started to build my third board. I put in some Vishay 1% 100 Ohm resistors I had fro some board onthe marquee and used those. i now get the correct range of voltages.

Arrggg So now I am going to replace them on my first build with the on board heat sinks and see how it runs. maybe cooler but I doubt it.

Nashou

HK-Steve · Posted: Tue Feb 19, 2013 8:38 am Post subject:

Cool, Glad you got it worked out.

Well my XS+ played up again last night, was watching Cloud Atlas, 3/4's the way through,
Blank screen.

No response to remote control, Reset XS+, no picture, Marquee was no problem, test patterns up. Grrrrr........

Look at it again today.

Cheers

CxTurbo · Joined: 13 Oct 2008 Posts: 425 Location: Ontario, Canada

That sucks Nash Glad you figured it out though.

James

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

the heatsink fins should be in a vertical positition.
try to let the regulators to regulate as less as possible, this reduces pd.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Oh I know Dennis. I just have it like that in the pictures. I will have the entire assembly facing up In the chassis. Unless I buy another chassis that is taller and put the fins vertical instead if horizontal and facing up. I still can't believe I didn't notice the restores were the wrong ones!!! Dooohhh!!!!!!

Also the Transformer was suppose to have a 10 volt out parallel 20 volt out in series. But i'm getting 11.54 VAC in center tap set up.

I am not jumping the wires as the data sheet says to and am just going out the 11,12 for one board and 7,8 for the other board.

I think the data sheet says to tie some of them together. I dont see why. This will be a more balanced output.

here is the data sheet for connections, see how they tie in 12 to 8 and 11 to 7. I assume I still take the tap outs from the way have it now 11 and 12 and then 7 and 8. I ahve to see if this lowers the voltage to 10 VAC.

http://www.hammondmfg.com/pdf/185Insert.pdf

Athanasios

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Well its much cooler but still gets warm. it went from 70c with those On board heat sinks to 26.6c with the large off board one. I should have went an inch wider!!! Wink

The next test will be to hook up one of the radiances and watch a movie. This was only about a 20 minute run.

Athanasios