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Amplifier Modules and PCBs For Sale

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Deleted member 148505

IRCore2000

Coming soon, blank PCB with all SMTs pre-soldered:

IRCore2000 Class-D Amplifier
IRS2092
2 Pairs IRFB4227
Beefy output inductor
Over temp protect
Housekeeping supplies built in, needs only +/- 75V Rails
 

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amplidude

Member
Joined 2016
It's alive

Finished one channel of your amp and it runs perfect, no audible hiss on my JBL tweeters,
So I'm off to drill heatsink and get some real power, and some measurements.
I will find more suitable power resistors to, project was cheap, I had some irs2092 chips, and I made a sample request at coilcraft, and they send me these nice inductors for free, so if you're building jle amp, it might be an idea for a free sample request for inductor
 

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amplidude

Member
Joined 2016
Great success

Got the pcb with premounted smd, thanks lester, one board running, but struggled alot with heatsink on totempole drivers, had to saw and grind, is there any heatsink that's plug and play?, you think surface is sufficient for high power continuous? Heatsink is 40mm by 40, with a few fins removed
 

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amplidude

Member
Joined 2016
Hi again.
A have today tried and power test the 2000-d module, it is hooked up to a 1.2kw 45v, 65 volt dc, 160000uf, dummy load is 8 ohm, 1khz.
My question is as you see in pic if I raise volume beyond 36v arms output, the wave flattens out like its hitting rail voltage, why is that happening ?? Output in 8 ohm is 150w
 

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D

Deleted member 148505

amplidude said:
Got the pcb with premounted smd, thanks lester, one board running, but struggled alot with heatsink on totempole drivers, had to saw and grind, is there any heatsink that's plug and play?, you think surface is sufficient for high power continuous? Heatsink is 40mm by 40, with a few fins removed
Click to expand...

A 40mm x 20mm copper or aluminum plate is sufficient, no need for finned heatsink. I will update BOM with suitable part number but we still have to drill holes.

amplidude said:
Tried putting scope in average mode and found out it was the 300khz carrier wave interfering, was able to get 41v clean since, above that it started some clipping.
Click to expand...

What is the rail voltage at clipping point?
Yes carrier residual is still present because there are no onboard filters to remove it. You can put additional filters on a breadboard, I'll update the build guide. Thanks!
 

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Stuey

Member
Joined 2006
Hi Lester,

How do you mount the Mosfets with your version of the GB150D? Using wires, or flat under the board? I note the original had the Mosfets near the edge of the board.

How does it perform on the scope? I remember Bigun from this forum had issues with stability when he made his version of this amp.

Thanks

Stuey
 
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amplidude

Member
Joined 2016
A quick question jlester.
It's regarding the greg ball amplifier.
I have four 300 watt toroidal transformers , and label says 36 volt on secondary, that adds up to the 50 volt dc the amp needs, all fine, except the transformers are old and back then our grid was 220 volt, so I measured them at current 230v grid unloaded, and they deliver +/÷56 volt dc, can the ska150 handle the extra voltage?
Thomas
 
D

Deleted member 148505

Stuey said:
Hi Lester,

How do you mount the Mosfets with your version of the GB150D? Using wires, or flat under the board? I note the original had the Mosfets near the edge of the board.

How does it perform on the scope? I remember Bigun from this forum had issues with stability when he made his version of this amp.

Thanks

Stuey
Click to expand...

amplidude said:
Hi.
I answered the same question and got this response, they are mounted flat under the board, sticking out the sides, the bd139/140 go on top of the mosfet.
As to stability I don't know, I'm waiting for boards, but am pretty sure they are stable
Click to expand...

Yes that's how it is mounted, very well explained :)

Regarding scope / thd measurements, yes it's stable, I'll publish them soon. I got busy with TPA3255 lately.

amplidude said:
A quick question jlester.
It's regarding the greg ball amplifier.
I have four 300 watt toroidal transformers , and label says 36 volt on secondary, that adds up to the 50 volt dc the amp needs, all fine, except the transformers are old and back then our grid was 220 volt, so I measured them at current 230v grid unloaded, and they deliver +/-56 volt dc, can the ska150 handle the extra voltage?
Thomas
Click to expand...

SKA GB150D can handle it but you can only use it for 8 ohms speakers.
Output stage of this amp is not designed for more than 150W at 4 ohms.
For home use / casual listening, 4 ohms is fine. But for party level volume / RMS output measurements, it's not advisable.
 
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amplidude

Member
Joined 2016
Stuey said:
Hi Lester,

How do you mount the Mosfets with your version of the GB150D? Using wires, or flat under the board? I note the original had the Mosfets near the edge of the board.

How does it perform on the scope? I remember Bigun from this forum had issues with stability when he made his version of this amp.

Thanks

Stuey
Click to expand...
Photos often say more, i glued copperbar on top of the matched bc546c bc556c to thermally stabilize them, in case you were wondering.
 

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D

Deleted member 148505

Nice idea about the copper bar.

Also don't forget to put solder blob on solder link under the PCB. (attached picture) And put parallel 10 ohms with the output inductor.

Looks like your mosfet has a different package? or is it just a dummy?

I separated the power ground plane from input ground plane so that I can experiment with it.
 

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