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Octave switcher layout question
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isak



Joined: Dec 13, 2009
Posts: 732
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PostPosted: Sun Sep 23, 2012 7:20 am    Post subject:  Octave switcher layout question Reply with quote  Mark this post and the followings unread

Hi guys Smile

i did a pcb design to a scheme i found hear in forum and i'm working on my pcb designing skills.
could you please let me know if i did a mistake? only by looking of course.

i thank you in advance.
Isak E.

EDIT:
i just found that i did a mistake by putting the 1k resistors in parallel when i needed to put them in series.
the attachment is updated.


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octave switch - comp + layout new.png
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isak



Joined: Dec 13, 2009
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PostPosted: Sun Sep 23, 2012 9:14 am    Post subject: Reply with quote  Mark this post and the followings unread

found another mistake and update the above attached.
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emdot_ambient



Joined: Nov 22, 2009
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PostPosted: Fri Oct 05, 2012 1:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

I haven't been on this forum in a while...

Nice one! Have you made it yet? And if so how well does it work?

What would the calibration procedure be? I'd not be sure how to use the Scale and Octive trimmers to set it up.

And...what would have to be done to convert it to 15V power supply?

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Osal



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PostPosted: Sat Oct 06, 2012 4:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hello Isak,

To avoid voltage drops when splitting the signal, the resistor at the output should be before the feedback, and 1K is the appropriate value.

You could solder the voltage divider's resistors in the rotary switch to simplify the PCB and the wiring to the front panel

You could save the trimmer resistor in the op-amp feedback matching the resistors to 0.1%. This would give you a worst case deviation gain of 0.002. For 5V at the input it would be -5.01V at the output that it is worst case error of about 1/17 tone.

It is recommendable to use a voltage reference instead of use the power rail directly.

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isak



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PostPosted: Tue Oct 09, 2012 4:16 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you Osal.

i'm making few changes with your suggestions.
will post new layout soon!

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