Has anybody ever build IRAUDAMP?

darw82 · 5th March 2007, 05:23 PM

Hi,
Has anybody ever build IRAUDAMP?
How does it sounds?

Which component to change, if I want to use it for 400W RMS (not peak) subwoofer?

Thank you.

ajazz · 7th March 2007, 01:01 PM

Yes I had built it using discrete components on a single sided PCB and it worked fantastic. I had boosted the output to 800 Watt RMS by using a rail of +-80 V with 100V Caps on each rail.
The Mosfets used were IRFP264N.
This being a typical Sigma Delta Modulator the output frequency reduces as you pump up the level and this tends to heat up the Mosfets a bit because of less dead time available. Hence i added a intentional more dead time by adding a RCD network between 74HC04 and IR2110. This reduced heating and the Amp worked Well at 200 Khz and full range.
Aha I also replaced LT1220 with LF356.
If you want I can send the PCB Layout (43mm X 60mm) which also includes a Global feedback which I introduced and worked well giving linear output on any load, less distortion and auto DC correction at the output. I measured only 1 -2 mV.

I hope this input gets u going to explore.

Pierre · 7th March 2007, 01:13 PM

Did you use that mosfets with no additional driver but the IR2110? It has quite a large gate capacitance!
What value did you use for the gate resistor?
Did you measure the rise/fall time of the switching waveform?

We would love to see that schematics, anyway!

Best regards,
Pierre

darw82 · 7th March 2007, 07:48 PM

Dear Ajazz,
Can you show me the schematic?

I also want to power this amp using SMPS, not linear power supply. Since this amp is self oscillating, not a fixed clock type, is it possible to synchronize this amp with the power supply?

darw82 · 7th March 2007, 08:04 PM

Dear Ajazz,
Can you show me the schematic?

I also want to power this amp using SMPS, not linear power supply. Since this amp is self oscillating, not a fixed clock type, is it possible to synchronize this amp with the power supply?

ajazz · 10th March 2007, 01:38 PM

As IR2110/2113 has got 1/2A output drive capability it has no problem in driving IRFP264N Mosfets.
I used a 47ohm gate resistor with IN4148 diode.

Yes this Amp can be syncronised with an external oscillator connected to the input integrator where your feedback resistor and Audio-in is connected. You can use HEF4047 whose frequency should be greater than the self oscillating Freq. of the Amp.
Or you can also connect a good triangle source to the noninverting input of the integrator.

Regarding the PCB layout & schematics I shall post it soon, as I am not very frequent on the Net it may take a day or two.

Maniac · 28th March 2007, 01:32 PM

Quote:

Originally posted by ajazz
As IR2110/2113 has got 1/2A output drive capability it has no problem in driving IRFP264N Mosfets.
I used a 47ohm gate resistor with IN4148 diode.

Yes this Amp can be syncronised with an external oscillator connected to the input integrator where your feedback resistor and Audio-in is connected. You can use HEF4047 whose frequency should be greater than the self oscillating Freq. of the Amp.
Or you can also connect a good triangle source to the noninverting input of the integrator.

Regarding the PCB layout & schematics I shall post it soon, as I am not very frequent on the Net it may take a day or two.

Any updates? I'm also very interested in taking a look at this.

ajazz · 29th March 2007, 01:45 PM

Dear members,
I am sorry for the delay in sending you all the schematics & PCB layout of modified IRAUDAMP. as I rarely sit on the net.
But be sure tomorrow I shall definately post all your requests.

Ajazz

kikikaka · 4th April 2007, 05:48 AM

Please, please ajazz....

I'm so curious...

ionutgaga · 12th December 2007, 03:26 AM

Oki doki Ajazz!
Where is the schematic?

5th March 2007, 05:23 PM	#1
darw82 diyAudio Member Join Date: Dec 2004 Location: Jakarta	Has anybody ever build IRAUDAMP? Hi, Has anybody ever build IRAUDAMP? How does it sounds? Which component to change, if I want to use it for 400W RMS (not peak) subwoofer? Thank you.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
IRAUDAMP mostly finished	pat allen	Class D	8	22nd August 2008 12:53 PM
Iraudamp and SMPS	oldmaelstrom2	Class D	3	2nd March 2006 01:03 PM
Do i need to build main supply (240v) filter?Or build power distribution?	thomgun_lc	Chip Amps	9	16th September 2005 09:52 AM
IRAUDAMP boosted to 1KW in 8 Ohms	ajazz	Class D	14	6th August 2005 10:14 AM
PREAMP suggestion for my IRAUDAMP.	pat allen	Class D	3	21st March 2005 12:42 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

7th March 2007, 01:01 PM	#2
ajazz diyAudio Member Join Date: Apr 2005 Location: INDIA	Yes I had built it using discrete components on a single sided PCB and it worked fantastic. I had boosted the output to 800 Watt RMS by using a rail of +-80 V with 100V Caps on each rail. The Mosfets used were IRFP264N. This being a typical Sigma Delta Modulator the output frequency reduces as you pump up the level and this tends to heat up the Mosfets a bit because of less dead time available. Hence i added a intentional more dead time by adding a RCD network between 74HC04 and IR2110. This reduced heating and the Amp worked Well at 200 Khz and full range. Aha I also replaced LT1220 with LF356. If you want I can send the PCB Layout (43mm X 60mm) which also includes a Global feedback which I introduced and worked well giving linear output on any load, less distortion and auto DC correction at the output. I measured only 1 -2 mV. I hope this input gets u going to explore.

7th March 2007, 01:13 PM	#3
Pierre Banned Join Date: Nov 2004 Location: Paris	Did you use that mosfets with no additional driver but the IR2110? It has quite a large gate capacitance! What value did you use for the gate resistor? Did you measure the rise/fall time of the switching waveform? We would love to see that schematics, anyway! Best regards, Pierre

7th March 2007, 07:48 PM	#4
darw82 diyAudio Member Join Date: Dec 2004 Location: Jakarta	Dear Ajazz, Can you show me the schematic? I also want to power this amp using SMPS, not linear power supply. Since this amp is self oscillating, not a fixed clock type, is it possible to synchronize this amp with the power supply?

7th March 2007, 08:04 PM	#5
darw82 diyAudio Member Join Date: Dec 2004 Location: Jakarta	Dear Ajazz, Can you show me the schematic? I also want to power this amp using SMPS, not linear power supply. Since this amp is self oscillating, not a fixed clock type, is it possible to synchronize this amp with the power supply?

10th March 2007, 01:38 PM	#6
ajazz diyAudio Member Join Date: Apr 2005 Location: INDIA	As IR2110/2113 has got 1/2A output drive capability it has no problem in driving IRFP264N Mosfets. I used a 47ohm gate resistor with IN4148 diode. Yes this Amp can be syncronised with an external oscillator connected to the input integrator where your feedback resistor and Audio-in is connected. You can use HEF4047 whose frequency should be greater than the self oscillating Freq. of the Amp. Or you can also connect a good triangle source to the noninverting input of the integrator. Regarding the PCB layout & schematics I shall post it soon, as I am not very frequent on the Net it may take a day or two.

29th March 2007, 01:45 PM	#8
ajazz diyAudio Member Join Date: Apr 2005 Location: INDIA	Dear members, I am sorry for the delay in sending you all the schematics & PCB layout of modified IRAUDAMP. as I rarely sit on the net. But be sure tomorrow I shall definately post all your requests. Ajazz

4th April 2007, 05:48 AM	#9
kikikaka diyAudio Member Join Date: Mar 2006 Location: Budapest	Please, please ajazz.... I'm so curious...

12th December 2007, 03:26 AM	#10
ionutgaga diyAudio Member Join Date: Jul 2006	Oki doki Ajazz! Where is the schematic?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)