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Class D Switching Power Amplifiers and Power D/A conversion

ucd 25 watts to 1200 watts using 2 mosfets
ucd 25 watts to 1200 watts using 2 mosfets
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Old 15th August 2012, 06:29 PM   #2291
sweetperfume is offline sweetperfume  India
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was facing problem of distortion on output so removed the 1n2 capacitor placed above osc res in irs3000d...it feeds the oscillating resistor...the problem was solved...is that a correct solution??????
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Old 16th August 2012, 12:58 AM   #2292
don2007ksa is offline don2007ksa  Philippines
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Hi sweetperfume i made the IRS2000 and work's fine the thing's that i found was the pcb layout from TLO71 output pin going to 2N5401 base and pin 7(B+) 5.6V there must be a 10 ohms in series. I used OSC. 1K and FB100k ,OCP 150 ohms;I power it with -/+ 95v.The only challenged that i'm facing right now is the output coil cause it's hard to find here in KSA,the install coil for the mean time heat's up when the gain reaches around 35 percent.I think the only different is the PCB layout for IRS3000.
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Old 16th August 2012, 01:02 AM   #2293
andrewlebon is offline andrewlebon  India
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Hi Don
greetings try ETD44 core with 3mm GAP in centre works great if you cant get
round core
warm regards
andrew lebon
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Old 16th August 2012, 04:15 AM   #2294
andrewlebon is offline andrewlebon  India
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Thumbs up ucd 2 pair

Hi Sameerx1
greetings recieved pcb files on mail looks ok make place for
ETD filter in centre no need of round core at present nice idea no 12volt supply
on pcb TIP31 NOT GOOD use 5 pin ic 3ampere supply i will check for mistakes
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andrew lebon
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Old 16th August 2012, 05:42 AM   #2295
sweetperfume is offline sweetperfume  India
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got a hard response ...the amp hits so hard...but one problem with it....it gives out square wave output...what should i do?????????
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Old 16th August 2012, 06:18 AM   #2296
ionutzxpo is offline ionutzxpo  Romania
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omg what did you do that you have a square on output? what capacitor did you use at the output filter? what inductance?
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Old 16th August 2012, 06:48 AM   #2297
sweetperfume is offline sweetperfume  India
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Quote:
Originally Posted by ionutzxpo View Post
omg what did you do that you have a square on output? what capacitor did you use at the output filter? what inductance?
output coil is 33uh and capacitor is 0.47uf....feelinng too sick about the response
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Old 16th August 2012, 07:19 AM   #2298
ionutzxpo is offline ionutzxpo  Romania
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nope,what type of cap do you use? should be polypropylene.
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Old 16th August 2012, 09:58 AM   #2299
don2007ksa is offline don2007ksa  Philippines
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thank's a lot andrewlebon i'll try find it here,good day.
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Old 16th August 2012, 11:52 AM   #2300
sweetperfume is offline sweetperfume  India
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Quote:
Originally Posted by don2007ksa View Post
Hi sweetperfume i made the IRS2000 and work's fine the thing's that i found was the pcb layout from TLO71 output pin going to 2N5401 base and pin 7(B+) 5.6V there must be a 10 ohms in series. I used OSC. 1K and FB100k ,OCP 150 ohms;I power it with -/+ 95v.The only challenged that i'm facing right now is the output coil cause it's hard to find here in KSA,the install coil for the mean time heat's up when the gain reaches around 35 percent.I think the only different is the PCB layout for IRS3000.

can u tell me exactly hw to place the 10ohm resistor in series
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