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Old 30th October 2013, 06:58 AM   #31
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
Thanks for pointing out, I mistakenly uploaded the wrong files... here's the correct one.

Simple explanation:

At startup, C3 will charge up.. When it's already charged, T4 and T3 will turn on, thereby turning on the relay. (Turn on delay depends on RC time constant of C3 and R4)

T1 (or T2 if the signal is negative) will turn on depending on the RC time constant of R2, C1, C2.

If T1 or T2 turns on, it shorts the C3 to the ground, thereby turning off the T4 and T3, so the relay will turn off..
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File Type: pdf SimpleProtect-withoutFanCtrl-Names.pdf (19.5 KB, 63 views)
File Type: pdf SimpleProtect-withoutFanCtrl-Schem.pdf (12.2 KB, 77 views)
File Type: pdf SimpleProtect-withoutFanCtrl-Values.pdf (20.1 KB, 61 views)

Last edited by jlester87; 30th October 2013 at 07:20 AM.
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Old 21st November 2013, 12:26 AM   #32
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Join Date: Jul 2011
Location: Argentina
Hello, I want to build this amp (JLAMP1200) for sub application, Im planning power up it with a smps and 4 ohm load. I understood there is a sigma-delta modulator, wich looks very interesting to me. Ive looking BOM but Ive some doubts about replacements:

* for 470 uF 25V cap 105C LL, part number is UVZ1E471MPD1AA (Nichicon) but RS number is 6841958, this last correspond to Vishay cap rated to 85C. Its ok to use cap 85 or 105?

* Whats the difference between IRS2110 and IR2110? Ive been looking both datasheets and the only difference that I seen is the propagation delay, is like "more simetric" in IRS2011. Can be used IR instead?

Thank you.
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Old 21st November 2013, 05:31 AM   #33
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Join Date: Sep 2010
Location: Quezon City
Quote:
Originally Posted by el gordo View Post
Hello, I want to build this amp (JLAMP1200) for sub application, Im planning power up it with a smps and 4 ohm load. I understood there is a sigma-delta modulator, wich looks very interesting to me. Ive looking BOM but Ive some doubts about replacements:

* for 470 uF 25V cap 105C LL, part number is UVZ1E471MPD1AA (Nichicon) but RS number is 6841958, this last correspond to Vishay cap rated to 85C. Its ok to use cap 85 or 105?

* Whats the difference between IRS2110 and IR2110? Ive been looking both datasheets and the only difference that I seen is the propagation delay, is like "more simetric" in IRS2011. Can be used IR instead?

Thank you.
Hi,

That capacitor should be a very good one because it is for the supply of the gate driver IC. I chose 105deg C because the capacitor is beside the heatsink of the gate driver regulator. The ambient temp on that area is elevated.

If you can't find 105degC you can use 85degC as long as the capacitor is reliable (> 2000hours at specified temp) based on the datasheet.


As stated in AN-1100, IRS2110 has an internal 20V clamp for each of the supply thereby increases suvivability against transient spikes.

You can also use IR2110, I haven't had any problems with it. I'm using it for almost a year with my JLAmp1000D.

Regards,
Lester
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Old 21st November 2013, 05:36 AM   #34
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Join Date: Sep 2010
Location: Quezon City
Assembling the JLAmp1000D and JLAmp1200D. Once I finished it (it may take a month or so due to my busy sched), I'll post the scope measurements.

Stay tuned
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Old 8th December 2013, 01:42 AM   #35
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Join Date: Sep 2010
Location: Quezon City
Almost done , just missing a couple of parts.
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File Type: jpg 11261968945_7d0e42af9b_z.jpg (194.0 KB, 236 views)
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Old 11th December 2013, 01:09 AM   #36
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Join Date: Mar 2007
Location: California
Still very interested in these amps... I'm looking forward to your next post.

What kind of testing were you thinking of doing? I think in the past you took some photos of the scope CRT but that was about it. Is there any way that you can do more detailed measurements of frequency response and distortion???

Also, I have a question about how the 1000 versus 1200 handle low impedance (<4R) loads. I need to drive a 2-ohm-nominal load (a subwoofer). I assume that the 1200 with 2 devices per rail would be best suited for this? What rail voltages would you say are "best" for this load?
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Old 15th December 2013, 11:08 PM   #37
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Join Date: Sep 2010
Location: Quezon City
I don't have necessary equipments for testing but, I am planning to setup a THD and frequency response measurement tool using soundcard and PC. I also have to make class D filter for measurement because I don't have AES-17 filter.

My 1000D was already tested to handle 500W into 2 ohms, using 65VDC supplies. I have yet to measure the power output of the 1200D.

These are my recommended transformer rating for my class-d amp. (Linear supply with minimum of 2 x 10000uf capacitors)

JLAmp1000D load : secondary (VAC), current rating (Amperes)
8 ohms load: 55-0-55, 10A
4 ohms load: 50-0-50, 12A
2 ohms load: 45-0-45, 15A

JLAmp1200D
>= 2 ohms load: 55-0-55, 20 A

SMPS: +-75VDC 25A
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Old 16th December 2013, 12:12 AM   #38
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Join Date: Mar 2007
Location: California
I think your SMPS recommendation is a little overkill. +/-75V at 25A is 3.75kW of power. I would think that +/-75V@10A would be enough.
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Old 16th December 2013, 01:13 AM   #39
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Join Date: Sep 2010
Location: Quezon City
That's only my recommendation, I provided a little headroom for it, of course you can also use lower voltages and lower peak power supplies.

Last edited by jlester87; 16th December 2013 at 01:15 AM.
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Old 17th December 2013, 02:23 PM   #40
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Join Date: Sep 2010
Location: Quezon City
Almost done, the boards were submerged in insulating varnish.

Faston tabs, input terminals, LM350 regulator and the mosfets should be soldered only after the boards were cured in varnish.

I'm excited to hear these monsters sing...
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