Sure 2x250 Amp build

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I just use Oak 1/2" Plywood with miter joints. Front panel is 1/4" Aluminum, rear panel is Hardboard. Both have several coats of flat black followed by several coats of satin black. Case Ebony stain with several coats of spray poly.




All the wire I used is Silver coated copper with Teflon case. All connections are soldered including the crimped on stakes.

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Re: Sure 2x250 Amp build

Craig designed the schematic and layout. Thanks Craig.

I used the Avel 625va Toroidal Transformer 40v+40v pt# 122-690 http://www.parts-express.com/avel-y2...ormer--122-690 which has two secondaries through two 400v 25amp Bridge Rectifiers http://www.parts-express.com/400v-25...ifier--050-060. two 10amp slow blow fuses and two 16000 68volt capacitors. Each big cap is also jumped with a 0.10 Q3 Audyn cap. I mounted the rectifiers on aluminum plate with thermo paste and screws.

[howard]

Re: Sure 2x250 Amp build

Very nice! Please be sure to let us know what you think when you get it going? What preamp are you going to use? It will be a nice feeling to be powering speakers you made with an amplifier that you built. Congratulations.
Howard

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Re: Sure 2x250 Amp build

Because I cant seem to leave good enough alone I mounted a glass knob on the front and shined two 12vdc led lights through it. I alson mounted a 12vdc coolermaster fan on the rear panel near the boards heatsink. These are powered with a 9vdc walwart.




Inlet holes to the left of the Rectifiers and near the walwart and rubber feet finish it off.
[IMG]
by the way, the front is held on with threaded inserts.
http://i413.photobucket.com/albums/pp216/arlis/sure%202x250%20amp/2x250amp022_zpscea75586.jpg[/IMG]

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Re: Sure 2x250 Amp build

This is bound for the home theater and will controlled by my Onkyo AVR. I did get some chatter on the right speaker last night during Two Guns. (very good movie) that makes me think the fan is causing some interference. not sure though.

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Re: Sure 2x250 Amp build

damn. I just noticed my speakers are wired out of phase. Imagine that.

[IBM5150]

Re: Sure 2x250 Amp build

That is pretty cool, nice job. Is there any turn-on pop? I've wanted to build one but never knew exactly what parts I had to have - soft start board, speaker protection board, size and wiring of caps & fuses, etc. The Sure 2x100 board I have does get a turn on/turn off pop or thump with a Meanwell 350-27 so I just set it aside. It's a good feature the Sure amps can handle a 4 ohm load as well.

Again, nice!

Eric

[Wolf]

Re: Sure 2x250 Amp build

Why did you use coax cable to wire the outputs?

Later,
Wolf

[philiparcario]

Re: Sure 2x250 Amp build

A suggestion some intake vents for cooling > unless I missed them. I suggest a hole near the front in the bottom panel .

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Re: Sure 2x250 Amp build

That is pretty cool, nice job. Is there any turn-on pop? I've wanted to build one but never knew exactly what parts I had to have - soft start board, speaker protection board, size and wiring of caps & fuses, etc. The Sure 2x100 board I have does get a turn on/turn off pop or thump with a Meanwell 350-27 so I just set it aside. It's a good feature the Sure amps can handle a 4 ohm load as well.

Again, nice!

Eric

no real pop to speak of.
thank you.

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Re: Sure 2x250 Amp build

Why did you use coax cable to wire the outputs?

Later,
Wolf

Thought the shielding was desirable. Do you disagree?

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Re: Sure 2x250 Amp build

A suggestion some intake vents for cooling > unless I missed them. I suggest a hole near the front in the bottom panel .

I agree.

[Wolf]

Re: Sure 2x250 Amp build

Thought the shielding was desirable. Do you disagree?

Shielding is desirable for the input stage, as that can be detrimental after it gets amplified. Once the signal is amplified, the voltage
output is less affected by any close noise generation.

Shield the inputs, standard large gauge the outputs.
Later,
Wolf

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Re: Sure 2x250 Amp build

Shielding is desirable for the input stage, as that can be detrimental after it gets amplified. Once the signal is amplified, the voltage
output is less affected by any close noise generation.

Shield the inputs, standard large gauge the outputs.
Later,
Wolf

probably should have got some 2wire plus shielding for the inputs. Is 14 gauge fine? I don't even think I could get that in the board. Holes are really small.
Any opinion on why I'm get a clicking sound from the right speaker?

[ameuba10]

Re: Sure 2x250 Amp build

Large gauge would be debateable. I would look for solid core for sure. 16ga should be plenty