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-   -   PWM signal to Audio signal possible? (http://www.diyaudio.com/forums/class-d/132955-pwm-signal-audio-signal-possible.html)

thx_dts71 11th November 2008 04:56 AM

PWM signal to Audio signal possible?
 
hello everybody,

can u help me convert PWM signal from this HT processor to
produce audio signal.
here's the block diagram of PS9818

http://i33.tinypic.com/29gjqmq.gif

what i'm gonna do is, to extract the audio signal from the PWM modulator.i dont intend to use the 6ch switching power stage.
i already have a DIY-mosfet 6ch amp.

here's the processor:

http://i35.tinypic.com/s3hgr8.jpg
note that PWM 1 to 8.thats the output stage going to the 6ch switching power stage that i omitted.
some say, i should use LPF (low pass filter) to decode this signal.

is it possible?is anybody here have a LPF design suitable for this application.
pls help..
thanks!

Pafi 11th November 2008 10:22 AM

Quote:

some say, i should use LPF (low pass filter) to decode this signal.
is it possible?
Absolutely! The simplest one is for example a 3k3 resistor from the PWM output to the input of amplifier and a 1n5 capacitor in parallel with the input of the amp.

thx_dts71 11th November 2008 03:38 PM

Quote:

Originally posted by Pafi


Absolutely! The simplest one is for example a 3k3 resistor from the PWM output to the input of amplifier and a 1n5 capacitor in parallel with the input of the amp.


ok brod.
do it look like this?

http://www.blogcdn.com/www.diylife.c...-outdetail.png


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