Problem in connecting LMF60 swithched capacitor low pass filter

crutschow

Joined Mar 14, 2008
28,544
What's wrong is you didn't read the data sheet. :rolleyes:
As shown here upload_2017-1-5_9-14-6.png
the output cannot drive a low impedance speaker.
You need to add an audio amp between the LMF60 output and the speaker.
 

Thread Starter

Amshul Duex

Joined Jan 5, 2017
3
I respect your reply..I did as you said..Please see my Proteus photo..but it is not working..changing R2 for more values ..not working .now any suggestion..cap.PNG
 

crutschow

Joined Mar 14, 2008
28,544
That's not an AC audio amp, that's a single transistor DC amp.

Also that circuit won't work with a single supply since the AC signal goes negative (below ground) for each half cycle..
Look on page 12 of the data sheet to see how to use the device with one supply.
 

Thread Starter

Amshul Duex

Joined Jan 5, 2017
3
That's not an AC audio amp, that's a single transistor DC amp.

Also that circuit won't work with a single supply since the AC signal goes negative (below ground) for each half cycle..
Look on page 12 of the data sheet to see how to use the device with one supply.
Oh !! after working a quite hard,I find a solution on youtube for proteus Error.Thank you so much for your support.
You can drink now.
 
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