Ironic fact about lm3914n datasheet

lm3914n 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. A better linear ramp generator can be made using an LM555 timer IC. In the 555 ramp generator, R1 controls the speed. Both ramp up and ramp down are generated at the same time. In RampGenerator2, R2 controls the speed, and S1 controls the ramp direction. The ramp is not nearly as linear as the 555 ramp generator, and when switching directions pot R2 works backwards from the other mode. If you really want to control ALL of the nuances of your LED ring, you can get much more precise control using a microcontroller, and wind up using just a very few parts.
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