Automotive UcD high-quality power amplifier 2x100W

[Sous]

High-quality UCD power amplifier with extra "integrator".

SNR 5W: 105dB
THD 10W: 0.0008% (measurement limit)
Carrier: 500k




P.S. sorry for my bad english😱
more information on http://forum.vegalab.ru/showthread.php?t=70258

 

[Sous]

pcb ready for DIY🙂

MAIN PCB 160x88.5mm

 

[Sous]

measured by an external audio card E-MU0204 usb,AC SMPS,
3,9 Ohm resistor + divider 1/10, and passive 3nd RC filter 25kHz.
Software tool: DSSF 5.2

Differences between the results of measurement on load resistor or real speaker can not be traced

 

[doctormord]

Nice one mate!

 

[Sous]

Thanks

 

[Sous]

new photos

 

[stewin]

hi sous nice clean work . which software are you using ??

 

[Sous]

Hi, stewin.
Microcap10 for simulation and LAYOUT6🙄 for tracing

 

[Sous]

I used to measure DSSF 5.2
spectraplus
RMAA

 

[stewin]

nice program . have you managed to drive car audio subwoofers like 2ohms load ??

 

[Sous]

I have not tried it for 2 Ohm.
One instance I use for subwoofer Focal performance p25 db in stereo mode.(2x4 ohm)

Output transistors optimized for low THD and 4 Ohm load. (IRFI4212), case heat dissipation area approximately 700 sq cm (1C/W)

In general, 2 ohms maximum music power must not exceed 100 watts per channel, which does not gives advantages in comparison with the load 4 ohm

 

[Sous]

Measure by spectraplus.

 

[Pafi]

Very nice design!

 

[Sous]

New revision of the modulator (mdr 3_2)

 

[badman]

Cool project!

 

[Sous]

Thanks!
few photos.
(Clipping on 3,9 Ohm load on waweform)

 

[ionutzxpo]

Hi,can you post the lay file for the latest modulator board?

Thanks!

 

[Sous]

Hi,can you post the lay file for the latest modulator board?

Thanks!

schematic diagram
http://forum.vegalab.ru/attachment.php?attachmentid=255933&d=1452850847

 

[ionutzxpo]

Thank you Sous!

 

[Sous]

I measured new version of modulator: (1kHz@3.9 Ohm) AD8066
SMPS 120W.
2W THD 0.0003%,
5W-0.0006%
25W-0.005%
80W-0.1%
100W-0.35%