Single supply rail to rail opamp uk?

[analogoutput]

FM VCO with Arduino (Hagiwo)

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 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)

I guess I should have looked at the schematics before posting that comment , because it turns out the opamp is only used to buffer the filtered dual PWM 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 …