Class D 200 Wrms with 2 mosfet cheap

jayadev

New member
i had the same problem and i was very confused because my earlier versions of this amp worked perfectly . but when i used irf 9640 it failed even three hours after working properly. when i changed to irf540n and irf9540n everything is o.k up to now even when using 4ohms at +/-50vlts

Problem in my circuit was the output inductor.when I properly measured it was just 15uH.I added a few more turns and now it is fine.but to be safe I changed the fet to IRF540.
 

stewin

Member
gtG 200 watts standard smd ver 1.2 btm.jpggtG 200 watts standard smd ver 1.2.jpganother version of 200watts smd amp .thanks to GOD and all diy world .

all the above amps i,ve tested and are working fine
 

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  • gtG 200 watts standard smd ver 1.2 pcb bottom.pdf
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stewin

Member
hi gilmarnet please check the output filtering capacitor after inductor .you must connect it in order for it to work
 

stewin

Member
Hi all my 4channel class d based on this circuit. The PCBfiles I posted on the previous posts but if you need any files feel free to askIMG_20170430_130909.jpgIMG_20170430_130901.jpgIMG_20170430_130756.jpgIMG_20170430_130816.jpgIMG_20170430_130909.jpgIMG_20170430_130901.jpgIMG_20170430_130756.jpgIMG_20170430_130816.jpg
 

Silvio

Well-known member
Hi Steve, What power did you get from this amp?
what is your amplifier voltage? Is it regulated? if not please tell me the peak voltage and the voltage at full load current.

Thanks Silvio
 
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stewin

Member
Hi Steve, What power did you get from this amp?
what is your amplifier voltage? Is it regulated? if not please tell me the peak voltage and the voltage at full load current.

Thanks Silvio

the amplifier power is very powerfull and it does not strain to reach that power . i mainly use +/-32vlts to+/-38vlts from 8 to 2ohms . the inductor i use is t130 - 26 or t130-52 with 1mm to 2mm gap at 32turns to 36turns and 680nf x 250vlts cap
 

stewin

Member
i`ve finish mount this amp with car smps and already test drive very hard yesterday and today, supply rail +/- 45 vdc. i`ll post picture here :D

regards.

norazmi uses +/- 45 with this amp but filtering of lc has to come to about 20khz .also bd139 and 140 are used as drives . i have ever used very succesfully +/-48vlts with bc and 2n as drivers but i do not remember details use norazmi specifications please .
 

Silvio

Well-known member
norazmi uses +/- 45 with this amp but filtering of lc has to come to about 20khz .also bd139 and 140 are used as drives . i have ever used very succesfully +/-48vlts with bc and 2n as drivers but i do not remember details use norazmi specifications please .

Ok Thanks Steve
 

stewin

Member
hi all still continuing with the 2step and 3step h pcb ab/h

the class d 200wt using n and p fets is very stable reliable and silent the only downfall is the voltage has to be up to +/-42vlts max which is abt 200wts in 4ohms . i wanted to add it to class h like manoj style with tlo72 2step and 3step please advice


1. i have mounted multiple d amps of 200wd in one casing without issues of noise and cross conduction.
2. less heat than ab amp
3. can handle lower impedance stably
4. d amp is price friendly

.also i have the below smd package opamps instead of tl072.
will they work in the step stage with this opamp ic 4550, cct8002 , 4558
 

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  • diyaudio.com 900W H-class PA Amp with Limiter pg 9 APEX STEP DRIVER.jpg
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  • forum.vegalab.ru  V.2013 storey PRO-amplifier in the class H pg 11 3 ?????.GIF
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jayadev

New member
i wanted to add it to class h like manoj style with tlo72 2step and 3step please advice

What is the benefit of Class H style Class D amplifier?

In Class D mosfets swings pulses almost rail to rail so efficiency is practically high.
 
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