# Single supply rail to rail opamp uk? **URL:** \ **Category:** DIY STUFF\ **Created:** [June 24, 2021, 7:05pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682 "2021-06-24T19:05:43Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [June 24, 2021, 7:10pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/2 "2021-06-24T19:10:56Z")
> [@FM VCO with Arduino (Hagiwo)](https://lookmumnocomputer.discourse.group/t/fm-vco-with-arduino-hagiwo/3566/6): > > The magic’s pretty much in the Mozzi library, the code is pretty simple and is just adapted from a Mozzi example. Not to denigrate @HAGIWO’s work! @fredrik said elsewhere [an MCP6002 ($0.36 at Mouser) should work](https://lookmumnocomputer.discourse.group/t/help-finding-rare-components/3540/4) in place of the NJM2732D ($2.58). It’d be even nicer if something from Tayda would work, but I don’t see any that are rail-to-rail input/output. > [@FM VCO with Arduino (Hagiwo)](https://lookmumnocomputer.discourse.group/t/fm-vco-with-arduino-hagiwo/3566/7): > > I guess I should have looked at [the schematics](https://note.com/solder_state/n/n88317851a4c7) before posting that comment grinning, because it turns out the opamp is only used to buffer [the filtered dual PWM output](https://sensorium.github.io/Mozzi/learn/output/), so if you have ±12 V you can power the opamp with that and use pretty much anything. If you only have +12 V, an LM358 could work as long as you only drive high impedance inputs, but in that case you might want to shift the input signal a bit to keep the output away from the minus rail (the LM358 is minus rail in, near minus … --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682)._