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Old 5th March 2007, 05:23 PM   #1
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Default 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.
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Old 7th March 2007, 01:01 PM   #2
ajazz is offline ajazz  India
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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.
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Old 7th March 2007, 01:13 PM   #3
Pierre is offline Pierre  France
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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
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Old 7th March 2007, 07:48 PM   #4
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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?
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Old 7th March 2007, 08:04 PM   #5
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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?
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Old 10th March 2007, 01:38 PM   #6
ajazz is offline ajazz  India
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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.
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Old 28th March 2007, 01:32 PM   #7
Maniac is offline Maniac  Taiwan
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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.
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Old 29th March 2007, 01:45 PM   #8
ajazz is offline ajazz  India
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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
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Old 4th April 2007, 05:48 AM   #9
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Please, please ajazz....

I'm so curious...
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Old 12th December 2007, 03:26 AM   #10
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Oki doki Ajazz!
Where is the schematic?
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