[sdiy] converting a 10v p to p to a 0-5 volt signal

Dan Snazelle subjectivity at hotmail.com
Thu May 21 00:31:46 CEST 2009


thanks for that old thread

is the SDIY archive search able anywhere??





> Hi,
>
> Tom Wiltshire wrote:
>> Do these techniques work on inputs being fed to an analogue-to-
>> digital convertor?
>>
>> Adam didn't mention it, but he's thinking of the ADC inputs on
>> these microcontrollers principally. Protecting logic inputs is
>> pretty easy.
>> For the ADC inputs (CV inputs into the microcontroller) you want to
>> be able to mix in external CVs and so forth, and you have no idea
>> what might get stuck in the socket. So any solution has to protect
>> the micro, but also can't affect the operation of the ADC. Current
>> limiting resistors will increase the time for the ADC to sample the
>> voltage, I'd have thought. But perhaps not enough to matter - Does
>> anyone have any practical experience trying this resistor+diodes
>> technique on microcontroller ADC inputs?
>
>
> According to this thread:
>
> http://dropmix.xs4all.nl/pipermail/synth-diy/2008-November/
> 011040.html
>
> Seb may be the man to ask.
>
> Oh, and don't forget that an op-amp in a circuit when powering up may
> push its output to one of the rails.
>
> Neil
> --
> http://www.njohnson.co.uk
>
>
>
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