electronicpresskit Posted December 20, 2011 Report Share Posted December 20, 2011 So I'm planning to add CV control of the Swing amount on my MB-808 by simply adding a summing stage after the Swing pot. I'm wondering about how well the core will handle >+5v at the input though. Will it be ok if it gets hit with +10v or do I need to limit the output of my summing stage to 5v? Thanks! epk Quote Link to comment Share on other sites More sharing options...
nuke Posted December 21, 2011 Report Share Posted December 21, 2011 ouch... 10v directly connected to pic-pins, never a good idea...should be limited in some way to avoid burning your pic... Quote Link to comment Share on other sites More sharing options...
electronicpresskit Posted December 22, 2011 Author Report Share Posted December 22, 2011 I'm still pretty new to working directly with PIC's and microcontrollers in general, so this is good info to know! Now I get to learn how to limit an opamp's output voltage! Thanks! epk Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted January 14, 2012 Report Share Posted January 14, 2012 http://www.ucapps.de...o_schematic.pdf here in the Interface and protection unit part schematic you can see how to limit an opamp's output voltage Quote Link to comment Share on other sites More sharing options...
electronicpresskit Posted January 14, 2012 Author Report Share Posted January 14, 2012 cool schematic! although I haven't yet been able to understand exactly how it's accomplishing the limiting. I ended up using two inverting opamps to do the summing, then adding a 1N4148 reverse polarity after the first opamp to limit it's output to negative voltages, then added a 4.7v zener diode (reverse polarity) on the output of the 2nd stage to limit the range to 4.7v and this seems to be working. Quote Link to comment Share on other sites More sharing options...
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