• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Amplifier Modules and PCBs For Sale

Status
Not open for further replies.
D

Deleted member 148505

Assembled kit prices sent through pm

Kit 1
JLAmp1200D Amp or JLAmp1000D
Softstart
Speaker protect with Fan control
Linear Power Supply with Clipping indicator
--------------------
Kit 2
JLaudiophile-250D
Softstart circuit
Linear Power Supply with Clipping indicator

You only need EI/Toroidal transformer to make it work.
 
D

Deleted member 148505

How much this Kit?:p

Will post on ebay once they become available to be sold internationally. :p

-----------------------------------
Assembled JLAudiophile-250 Specs

Voltage: +-40V DC Min to +-56V DC Max Rails
Aux Supply: 12V AC or 12V DC 250mA (For speaker protect)
Output Power: 140W @ 8ohms, 280W @ 4ohms, 400W @ 2ohms
Voltage gain: 36
Load impedance: 2 ohms to 8 ohms
Module dimensions: 2.8" x 4.7" x 1.7"

Parts Used:
IRFB5615 x 2
Coilcraft 22uh VER2923-223
22uf 63V Panasonic FC input cap and VBS
15A@120VAC Relay
 
D

Deleted member 148505

Power Supply with Stereo Clipping Indicator now available on my eBay Page!
 

Attachments

  • IMG_9166.jpg
    IMG_9166.jpg
    290.7 KB · Views: 779
  • IMG_9161.jpg
    IMG_9161.jpg
    255.4 KB · Views: 729
  • IMG_9147.jpg
    IMG_9147.jpg
    212.8 KB · Views: 529
  • IMG_9140.jpg
    IMG_9140.jpg
    296.5 KB · Views: 511
  • PSU Clip Indicator.png
    PSU Clip Indicator.png
    26.9 KB · Views: 517
D

Deleted member 148505

Assembed and fully tested JLAudiophile-250D Modules now available on my ebay.


------------------------------------
Hello jlester87, the beat frequency is presented in the class D amplifier is a reality when a switching power supply used.
with linear processors and you make no noise tests

PS: the above does not apply to the amp with IRS2092

Greetings ...

I used my JLAmp1200D with an +/-50VDC SMPS supply. No noise or hiss encountered in sound quality tests
 

Attachments

  • smps jlamp1200d.jpg
    smps jlamp1200d.jpg
    367.7 KB · Views: 214
Last edited by a moderator:
D

Deleted member 148505

How many watts can this do into 8 ohms?
JLAmp1200D with +/- 85V DC rail voltage can do 450W RMS Power @ 8 ohms.

Although in my actual power measurement, I only got 390W at clipping point due to voltage sagging of the power supply that I've used. Here's the latest measurement of my JLAmp1200D with a pair of IRFP90n20d mosfets. The nominal rail voltage is +/- 85V DC, the rail voltage in the table is the sagged voltage measured at clipping point.
 

Attachments

  • ptable.JPG
    ptable.JPG
    38.2 KB · Views: 468
Last edited by a moderator:
D

Deleted member 148505

Thanks for the reply. How would you rate this amp for Hi end duty on some ATC passive monitors?
Regards

Full-range sound of JLAmp1200D is good, crystal clear and no noise. But for the extra detail and full-bodied midrange sound, I recommend my JLAudiophile-250D amp for high end speakers.
 

Attachments

  • jlaudiophile.jpg
    jlaudiophile.jpg
    686.9 KB · Views: 763
Last edited by a moderator:
D

Deleted member 148505

JLAmp1200D V1.2

Enhancements:
-Added IR2110 mute header
-Various component placement enhancements
-Added support for Coilcraft 2923 high current inductors
-Added SMD bypass capacitors
-To-247 Mosfet package support
 

Attachments

  • 14197153417_46441d5663_b.jpg
    14197153417_46441d5663_b.jpg
    297.2 KB · Views: 691
Last edited by a moderator:
D

Deleted member 148505

I just bought a Watt Meter,

Here are the measurements of JLAmp1200D with 2 pairs of IRFB4227 mosfets. (Measured in 220VAC mains socket)

The system consists of 1500VA EI Core Transformer, Softstart circuit, Speaker protect circuit and JLAmp1200D Module.

Total idle system power consumption when amp is self oscillating: 37W
Total idle system power consumption when not oscillating: 26W
System power consumption with JLAmp1200D module removed: 25W
 
D

Deleted member 148505

System power consumption with Softstart and Speaker protect circuit removed: 24.7W

So the biggest power consumer here is the Linear supply (EI Core Transformer, parallel bridge rectifier, Filter Capacitors): 24.7W

JLAmp1200D Module Self Oscillating: 11W.

Softstart Circuit and Speaker Protect Circuit: < 1W

At mute mode, JLAmp1200D is consuming just less than a watt.
 
D

Deleted member 148505

Been able to test the stereo sound of JLAudiophile-250D, I'm very happy because it was better in every aspect (bass response, mids, highs, ambience) compared to my previous IRS2092 ebay amp :) The details were the same but the mids are more fatter / rounder and the highs are more softer and more pleasing :):):)

I bet it will perform better in objective measurements / tests.
I'll update the BOM with the parts I used...
 

Attachments

  • jlaudiophile-250d.jpg
    jlaudiophile-250d.jpg
    251.8 KB · Views: 603
D

Deleted member 148505

Complete stereo power amp setup: (no preamp)

2 x JLAudiophile-250D Modules with built in speaker protect
Stereo Automatic Fan control
Power Supply with Clip Indicator
CPU Fan
EI Core with KBPC3510 Bridge Rectifier.
 

Attachments

  • 14550531325_0a48b42a2b_c.jpg
    14550531325_0a48b42a2b_c.jpg
    283.5 KB · Views: 748
Status
Not open for further replies.