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<div class="moz-cite-prefix">Hi Christian <br>
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I'm working on an analog input for the synthimuse Version 2.</div>
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<div class="moz-cite-prefix">It's untested but here's my first draft
of the input that ranges from -5.6 V to +5.6V and scales it to
just inside the 3.3V Range.<br>
Changing the scaling resistors slightly and adjusting the offset
should hopefully get you the range you're looking for.<br>
Schematic image below, LTSpice file attached.<br>
<br>
I'm happy if anyone wants to rip it to pieces as I'd rather find
out my folly now, instead of when my prototype stuffed boards come
back. ;-)</div>
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<div class="moz-cite-prefix">Best regards<br>
Gerry<br>
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<img src="cid:part1.B8F850F2.738BFF41@gmail.com" alt=""
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On 04/12/2020 13:31, Christian Maniewski via Synth-diy wrote:<br>
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<div> Hi all!</div>
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<div>I’m trying to come up with an op-amp design for a CV input.
I want to transform a signal ranging from -5V to +7V to a more
MCU digestable 0-3.3V. I came up with the circuit you’ll find
attached.</div>
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<div>I have seen other approaches, where an offset reference is
injected in the feedback loop, while the positive op-amp input
is grounded. Are there any disadvantages to my approach or is
it also valid?</div>
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<div>Thank you so much!</div>
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<div>I’ve been following this email list for some time now. This
is my first question and first email entirely. Please bear
with me.</div>
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<div>Chris</div>
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