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I remember a walkaround throttle with memory in MR long ago. It used push buttons and there were plans on how to build it.Sorry can't find it, but I do remember wanting to build it (never did).Edit: this might be it (because I see push buttons)data:image/png;base64,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
And in a twist the reason I hate DCC so much is because I want a knob
There are plenty of DCC handheld throttles which have knobs for speed adjustments. Granted some are endlessly spinning encoders, but some of them use old fashioned potentiometers like the ones used in DC throttles.
Interesting you say this, because I have just been working on a way to use a rotary encoder in a wireless RF walk-around that would then drive a digital pot at the other end, allowing wireless remote control of a conventional DC throttle circuit that uses a pot for the speed control. I am not even going to attempt using a potentiometer for this purpose, as interfacing that to some sort of digital converter and then to the RF transmitter would be a heck of a lot of work.