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

[Ray Wilson]

You can definitely get gains less than one. Look at an expo convertor summer 
for example. The 100K input resistors and 2K feedback resistor result in a 
gain of .02. The formula still applies Feedback-R divided by Input-R.


----- Original Message ----- 
From: "Dave Kendall" <davekendall at ntlworld.com>
To: "synth DIY" <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, May 20, 2009 7:02 AM
Subject: Re: [sdiy] converting a 10v p to p to a 0-5 volt signal


> Correct me if I'm wrong, but in the non-inverting mixer/summer 
> configuration, I thought it wasn't possible to get an output gain less 
> than 1, which you would need to get ±5V down to 0-5V using a single opamp 
> ? .....
>
>
> cheers,
> Dave
>
> On May 20, 2009, at 13:07, David Panseri wrote:
>
>> Also if you want to save Op Amps you can use a non-inverting 
>> configuration.
>>
>> -Dave
>>
>> On Tue, May 19, 2009 at 8:49 PM, Jason Proctor <jason at redfish.net> wrote:
>>> i did exactly this for my Arduino module. it bidirectionally interfaces 
>>> a
>>> +/-5v signal to the micro's 0-5v range.
>>>
>>> turned out to be pretty easy - on the way in, chop the signal in half, 
>>> and
>>> bias with +2.5v. then reinvert. on the way out, do the opposite. 1 dual
>>> opamp each way.
>>>
>>> lmk if you want the details.
>>>
>>> (i should also thank Tom Wiltshire here for his help getting me off the
>>> ground with this stuff.)
>>>
>>>
>>>> tonight i was looking at my scope
>>>>
>>>> Checking the input into a circuit that was only able to take 0-5 volts
>>>>
>>>> Sure enough, the signal was between 0 and 5 but the sawtooth was 
>>>> clipped.
>>>>
>>>> So i am looking for a input block that can take either
>>>> 5vp to p or 10v p to p (or any synth signal)
>>>> and spit it out as a 0-5 signal without squaring the top.
>>>>
>>>>
>>>> anyone know of a good circuit for this?
>>>>
>>>> thanks
>>>>
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