ucd 25 watts to 1200 watts using 2 mosfets

[manojtm]

i managed to make this thing work but dint get any much success......on low volume it works as clean as a headphone does but when increase volume there is a distortion in the speakers...like someone is tearing papers......help me out with this issue??????

I think your output filter not good or not matched (saturated) with current freq.. pls provide your schematic

RGDS
MANOJ

[paskal9]

Originally Posted by irvynejay

can you post some photo so we can see what, where is the problem

top and bottom

haven't built the pcb yet. i was contemplating to either redraw the schematic and include the 12v aux supply and a dc protection or just etch the pcb provided by thienchay at post #2101 & #2102.

seeing how simple it is i redraw the schematics when i see the pinout of the cd4049 is different compared to the pinout used in cheshta's and thienchay's pcb. so i was wondering if anyone have etched and built the irs900 using cheshta or thienchay's pcb.

here's the original schematic of the irs-900d posted by cheshta:

together with the cd4049 pinout from his post:


a remake of the pcb from thienchay:


and he's the pinout from cd4049 datasheet:


pin 7 and 8 shouldn't be shorted together and some other error. or am i reading it wrong somewhere?
would really love to hear any feedback from people who have built the irs900.

[exflaco]

Too muchs mistakes may by Irvynejay or other people could help us

[irvynejay]

i don't have schematic i only made the amp without it and its working great
i only use detex file to make the pcb

[thienchay]

I apologize because i'm did not checking carefully schematic of Detex .
I think they deliberately show ​​the wrong schematic , but given right PCB .
And i recheck it , they just used 2 NOT gate of CD4049 on their PCB , and it is right , orther NOT Gate is not used .

This is the schematic i redraw .

[paskal9]

Originally Posted by irvynejay

i don't have schematic i only made the amp without it and its working great
i only use detex file to make the pcb

Originally Posted by thienchay

I apologize because i'm did not checking carefully schematic of Detex .
I think they deliberately show ​​the wrong schematic , but given right PCB .
And i recheck it , they just used 2 NOT gate of CD4049 on their PCB , and it is right , orther NOT Gate is not used .

This is the schematic i redraw .

thanks guys!
that's all that i needed to hear. the schematic is indeed with error. now that i have you guys that have built a working pcb i know not to follow the schematic and build the amp according to the posted pcb.

thanks again guys

[irvynejay]

take note input ground connection to main ground psu,,have fun making it its good amp,

[stewin]

can irfp260N work at +/- 85vlts with this pcb? and has any one tried this amp with +/-90vlts & what output fets did you use?

[chago25]

Originally Posted by irvynejay

i don't have schematic i only made the amp without it and its working great
i only use detex file to make the pcb

its not only working great its powerful also!

[stewin]

Originally Posted by chago25

its not only working great its powerful also!

what voltage did you use and was the outputs heating ?