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Class D Switching Power Amplifiers and Power D/A conversion

My very first Class D pwm (switching) amplifier.
My very first Class D pwm (switching) amplifier.
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Old 17th January 2007, 08:42 AM   #591
rogs is offline rogs  United Kingdom
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Join Date: Jul 2006
Unfortunately I don't seem to be able to access the schematic again at the moment, but from what I recall the variable resistor enabled the adjustment of a 'monitor' of some sort.
What I don't understand is why it is necessary to be able to vary between 5.11K (+ the tolerance of the minimum pot position) and 15.11K (+ the tolerance of the pot end position).
If the adjustment is likely to be around the variable resistance centre point, and within a range that is reasonably 'easy' to calibrate, then I would have thought 4K7 would have been perfectly adequate.
If you need to calibrate to within 10R (the present resistor is shown to 3 decimal places) how on earth do you 'tweak' a variable to that degree of accuracy (20 turn device?)

And why? -- if your design is that fragile, you've probably got it wrong!
Heaven knows what happens if the ambient temperature changes!!

I've obviously missed the point somewhere here!
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Old 17th January 2007, 12:28 PM   #592
phase_accurate is offline phase_accurate
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Join Date: May 2002
Location: Switzerland
Depending on which series of resistors you use (and you better use what your company is using by default !) there is neither a 4.7k nor a 5.1 k resistor available if you want to achieve a tuning range of 5 to 15 k. So the nearest value is 5.11k !!!!

Simple as that !


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Old 17th January 2007, 03:20 PM   #593
rogs is offline rogs  United Kingdom
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At my end of the pecking order, the purchasing people moan if they have to stock E24 values, let alone E 48, 96 or 192!!

And if I presented a design that could not accept a 4K7 to 14K7 range instead of a 5K to 15K range it would be thrown straight back at me as 'too fussy' !

Now if I worked a little higher up the scale----
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Old 20th January 2013, 12:02 PM   #594
luizcpimenta is offline luizcpimenta  Brazil
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Join Date: Oct 2009
Originally Posted by ssanmor View Post
Hello all again.
Here are the "definitive" version of my first prototype schematics. If anyone of you wants to have a look at them, any comment will be welcomed.
Meanwhile, I am ending the PCB design.

Thanks in advance.


Good day Sergio.
Could you send me the final files?
Thank you.
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Old 22nd January 2013, 10:50 AM   #595
manojtm is offline manojtm  India
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Location: KERALA
Hi fehrudi,

not using SD then replace R7(10K) with jumber and R3(10R) not required short that point with jumber. cracking sound b'cause of SD point not good.

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Old 25th December 2014, 04:19 PM   #596
stewin is offline stewin  Kenya
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merry CHRISTmass to you all
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