Amazing 555 ic datasheet

555 ic datasheet

That could be controlled by the RC time of the ramp generator. You can make a simple ramp generator from a CMOS logic IC that has a Schmitt-trigger input an an inverting output, like a 4093 quad NAND gate or 40106 hex inverting buffer, a couple of diodes, a resistor, a capacitor and a pot. The ramp is not nearly as linear as the 555 ramp generator, and when switching directions pot R2 works backwards from the other mode.
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