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 Forum index » DIY Hardware and Software » PAIA Equipment
PAIA low pass filter question
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Cfish



Joined: Feb 24, 2016
Posts: 451
Location: Indiana

PostPosted: Fri Oct 07, 2016 1:17 pm    Post subject: PAIA low pass filter question Reply with quote  Mark this post and the followings unread

Hi all

Quick question for those of you with a stronger electronics background than myself.

I want to perf board this schematic up to play with. However I would rather use my existing 15v+- power supply for this version.

If I'm thinking correctly, I just need to change the values of R10 and R11

Problem is I loaned out the book I would usually refer to in such sercumstances.

Any suggestions?

I would like to try it rail to rail on the power supply to eliminate the offset

I'm thinking the diodes for control would still attach to 0V. Am I thinking correctly?


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Grumble



Joined: Nov 23, 2015
Posts: 756
Location: Netherlands
Audio files: 23

PostPosted: Wed Oct 12, 2016 1:53 am    Post subject: Re: PAIA low pass filter question Reply with quote  Mark this post and the followings unread

Cfish wrote:

I would like to try it rail to rail on the power supply to eliminate the offset

Could you elaborate on this, because I have no idea what you mean?
Are you saying you want the emitter of Q1 to -15 volt?
Because the input as the output are both AC coupled.
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Cfish



Joined: Feb 24, 2016
Posts: 451
Location: Indiana

PostPosted: Thu Oct 13, 2016 7:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes grumble. That is what I was thinking.

Started to think about replacing the transistor with an op amp.

Not sure what my best option is.

I'm about finished with another project, then I can bread board it and start. Playing.

Just trying to minimize the magic smoke
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Grumble



Joined: Nov 23, 2015
Posts: 756
Location: Netherlands
Audio files: 23

PostPosted: Thu Oct 13, 2016 1:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

why not use the circuit as drawn? there is no offset, the output is ac coupled as is the input.
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Cfish



Joined: Feb 24, 2016
Posts: 451
Location: Indiana

PostPosted: Fri Oct 14, 2016 4:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Will give it a try.
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