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 17th January 2014, 05:09 PM   #51
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
First time to listen to my JLAmp1000D in fullrange stereo, the sound is surprisingly good!
The treble is soft, not irritating and there's ambience and echo, soundstage is very wide. I'm very proud of it

Here's the youtube vid so that you'll have an idea of its sound. The camera audio sucks, the sound is wayy better in person of course. The background is also not clear because we live near a busy highway...

JLAmp1000D Stereo Sound Test - YouTube
  Reply With Quote
Old 17th January 2014, 07:18 PM   #52
diyAudio Member
 
Join Date: Jun 2010
i was said before
i like your amps
please give me the shematic and PCB
thanks
  Reply With Quote
Old 25th January 2014, 09:12 AM   #53
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
Trying the scaled down version of JLAmp1200D. I will be using IRFB5615 mosfets. The mosfets will use the same heatsink as the regulator (20degC/W)., The Totem Pole SMD buffers were bypassed by putting jumpers on PCB.

Target 300W @4ohms, "audiophile" sound

Will run at +-53VDC. By scaling down components, costs were almost cut to half compared to 1.2KW version
Attached Images
File Type: jpg IMG_2175.jpg (914.4 KB, 205 views)
  Reply With Quote
Old 25th January 2014, 06:55 PM   #54
stewin is offline stewin  Kenya
diyAudio Member
 
Join Date: Jul 2007
hi jlester what are the thd measures?
  Reply With Quote
Old 26th January 2014, 01:10 AM   #55
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
Haven't measured THD yet. Maybe in next two weeks.
  Reply With Quote
Old 31st January 2014, 01:20 PM   #56
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
Next project:

IRS2092 IRAUDAMP7 all through hole parts implementation with Coilcraft AGP2923-223 inductor.
Size: 2.2" x 4.8"
Attached Images
File Type: jpg jlaudiophile-250d.jpg (180.0 KB, 161 views)
  Reply With Quote
Old 31st January 2014, 03:41 PM   #57
diyAudio Member
 
Join Date: Mar 2007
Location: California
If the design is not finalized, is there any chance that you could make all the active devices heatsink mounted below the pcb like you did with the JLAmp1200/1000? That would set it apart from the LJM version, and all the others like it out there.

Last edited by CharlieLaub; 31st January 2014 at 03:59 PM.
  Reply With Quote
Old 2nd February 2014, 04:09 AM   #58
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
Quote:
Originally Posted by CharlieLaub View Post
If the design is not finalized, is there any chance that you could make all the active devices heatsink mounted below the pcb like you did with the JLAmp1200/1000? That would set it apart from the LJM version, and all the others like it out there.
Thanks for the suggestion, we can provide better heatsink for the mosfets by mounting it below the pcb.

I also added 10A speaker protection circuit, it requires external 12-0VAC.

Size is now 2.8" x 4.9"
Attached Images
File Type: png JLAudiophile-250D.PNG (126.0 KB, 133 views)
  Reply With Quote
Old 3rd February 2014, 07:07 PM   #59
diyAudio Member
 
Join Date: Mar 2007
Location: California
Quote:
Originally Posted by jlester87 View Post
Thanks for the suggestion, we can provide better heatsink for the mosfets by mounting it below the pcb.

I also added 10A speaker protection circuit, it requires external 12-0VAC.

Size is now 2.8" x 4.9"
Hi Lester,

I like this better because I can easily mount the board directly to a heat sink and that can be part of (e.g. the side of) the amp case, or on the back of a powered loudspeaker.

Any reason why you don't also do that with the 7812 regulator? The hole for it could be under R114, which could be repositioned slightly along with R113(?) in the corner of the board where they are located. That way all heat generation could be tied into the same heatsink that rejects heat to the outside of the case/enclosure...

-Charlie
  Reply With Quote
Old 4th February 2014, 01:28 AM   #60
diyAudio Member
 
Join Date: Sep 2010
Location: Quezon City
Quote:
Originally Posted by CharlieLaub View Post
Hi Lester,

I like this better because I can easily mount the board directly to a heat sink and that can be part of (e.g. the side of) the amp case, or on the back of a powered loudspeaker.

Any reason why you don't also do that with the 7812 regulator? The hole for it could be under R114, which could be repositioned slightly along with R113(?) in the corner of the board where they are located. That way all heat generation could be tied into the same heatsink that rejects heat to the outside of the case/enclosure...

-Charlie
Hi Charlie,

With the right input voltage to feed the regulator, the LM7812 doesn't need heatsinking because the current which keeps the relay on will be quite low (around 50ma).
  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
500W PA amplifier with Limiter apexaudio Solid State 2907 16th April 2014 08:02 PM
500W RMS PA Amplifier jacobsetti Solid State 28 1st November 2013 07:04 PM
WANTED: Subwoofer Plate Amplifier (500W RMS / 4 Ohms) ViperZ Swap Meet 1 1st February 2010 02:36 AM
Looking 500W 4ohms amplifier for Polk Subwoofer samsagaz Subwoofers 4 24th June 2009 08:47 AM
FS : 500w Subwoofer plate amplifier Keiga KGND5250 smallangryboy Swap Meet 4 3rd April 2009 04:56 PM


New To Site? Need Help?

All times are GMT. The time now is 06:23 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2