Tried with a few built in linear tech opamps none rail-rail parts work, such as the LT1495 opamp.
The LT1638 worked fine. Would these https://www.diodes.com/assets/Datasheets/TLV27x.pdf https://www.diodes.com/assets/Datasheets/TLV27x.pdf work inplace of it?
Why do you say that?Opamps have low input current but going straight from the timing capacitor into the rail-rail opamp without any buffers doesn't work.
The issue is it should be single supply. I did put together a circuit from one of the links but it turned out to be a specific chip. https://www.maximintegrated.com/en/app-notes/index.mvp/id/4362 That ne555 is very scaleable.Since you already have opamps, why not ditch the 555 and build the 2-opamp triangle generator shown in the first link suggested by Bertus in post #10? That will give a more linearly sloped triangle and avoid the need for a buffer stage. You would need a third opamp to remove the offset.
Why do you need to eliminate the offset?
In that case the noninverting buffer should be some transistor buffer to save board space.Those Diodes op amps should work okay.Why do you say that?
Without what buffer?
If you are referring to the first op amp non-inverting buffer, of course you need that.
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