Amplifier Modules and PCBs For Sale - Page 4 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Vendor's Bazaar

Vendor's Bazaar Commercial Vendors large & small hawking their wares

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st November 2013, 05:31 AM   #31
diyAudio Member
 
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
  Reply With Quote
Old 21st November 2013, 05:36 AM   #32
diyAudio Member
 
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
Click the image to open in full size.
  Reply With Quote
Old 8th December 2013, 01:42 AM   #33
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
Almost done , just missing a couple of parts.
Attached Images
File Type: jpg 11261991306_686db1cab5_z.jpg (140.8 KB, 555 views)
File Type: jpg 11261968945_7d0e42af9b_z.jpg (194.0 KB, 519 views)
File Type: jpg 11262015885_002fc1a640_z.jpg (181.2 KB, 503 views)
File Type: jpg 11262021636_c83796fcb8_z.jpg (167.0 KB, 148 views)
  Reply With Quote
Old 11th December 2013, 01:09 AM   #34
diyAudio Member
 
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?
  Reply With Quote
Old 15th December 2013, 11:08 PM   #35
diyAudio Member
 
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
  Reply With Quote
Old 16th December 2013, 12:12 AM   #36
diyAudio Member
 
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.
  Reply With Quote
Old 16th December 2013, 01:13 AM   #37
diyAudio Member
 
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.
  Reply With Quote
Old 17th December 2013, 02:23 PM   #38
diyAudio Member
 
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...
Attached Images
File Type: jpg IMG_1656.jpg (1,009.6 KB, 153 views)
  Reply With Quote
Old 23rd December 2013, 02:46 AM   #39
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
Quote:
Originally Posted by jory16 View Post
I can you please make 2 measurements with the oscilloscope, to make a comparison of forms of waves that do not seem quite right?
Finished assembling JLAmp1200D, worked at first power up. Here are some scope measurements. The amp is running at 333kHz idle with 4 ohms dummy load connected to it.

Sound is clear, punchy bass, highs are just right and no sibilance. (I'll upload a youtube video lol)
Attached Images
File Type: jpg integrator.jpg (284.5 KB, 521 views)
File Type: jpg level shift.jpg (293.0 KB, 475 views)
File Type: jpg cd4069 hi out.jpg (291.2 KB, 445 views)
File Type: jpg cd4069 low out.jpg (290.0 KB, 414 views)
File Type: jpg IR2110 HO.jpg (221.3 KB, 399 views)
File Type: jpg IR2110 LO.jpg (288.5 KB, 77 views)
File Type: jpg prefilter.jpg (250.7 KB, 74 views)
File Type: jpg dc offset.jpg (384.5 KB, 104 views)
File Type: jpg jlamp1200d.jpg (251.1 KB, 123 views)
File Type: jpg jlamp1000d.jpg (313.5 KB, 131 views)
  Reply With Quote
Old 23rd December 2013, 08:35 AM   #40
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
Hi Jlester
greetings just want to ask why IR2110 has heatsink on it try FAN7392 IC
nice boards
warm regards
andrew lebon
__________________
[image][/image]"It's Better to try and fail than to never know and always wonder"
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sale - First One Amplifier ( 4 modules ) scoutOne Swap Meet 3 17th January 2015 04:38 AM
Class D B&O Power amplifier modules for sale audiosteve Swap Meet 0 2nd July 2014 03:03 PM
12 RTS100 100 Watt Amplifier PCBs for Sale AAK Swap Meet 11 4th March 2012 11:43 AM
Limited Edition NX400NP Synergy Amplifier Modules For Sale!!! The Saint Vendor's Bazaar 11 7th June 2008 12:34 AM
NX150 Amplifier Modules Version One On Sale The Saint Vendor's Bazaar 10 10th April 2007 02:49 AM


New To Site? Need Help?

All times are GMT. The time now is 08:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2