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-0.7V rail creation for op amp
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Zero999:

--- Quote from: Hiemal on January 11, 2019, 11:33:02 pm ---As an alternative you can use a 555 timer as a charge pump to create a negative voltage.


--- End quote ---
Yes, let's not forget the classic 555 timer circuit. It will need a lot of filtering though to get rid of the noise. Another option is to replace the 555 with a different oscillator. A Schmitt trigger oscillator using the 74HC1G14 would be perfect: it would use less power and space than the 555.
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