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

[Neil Johnson]

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