Fx3_hdrive Posted June 24, 2004 Report Share Posted June 24, 2004 hi there is a web site. its self-explanatory. http://www.4qdtec.com/stpen.html another H-bridge could drive the stepper. i think this can be researched into a great controll surface, especialy cheep. i've found a 5 1/4" teac floppy drive in my garage (which has a great stepper motor in it) and i'm shure that if you visit some carboot sales, you can get them pretty cheep. regards yarek T. Quote Link to comment Share on other sites More sharing options...
Guest JimCook Posted June 24, 2004 Report Share Posted June 24, 2004 As they note in the text at that site:"The problem with a stepper (or any other motor) used as a generator is that at very slow speeds it gives virtually no output - so there is a problem with slow speeds. You have to make some sort of trade off between high speed and low speed performance. Proper encoders use optical switches which work at any speed. Of course their problem at slow speeds can be jitter."I don't think you'll be able to spin a stepper by hand fast enough to get it to work as a panel encoder. Quote Link to comment Share on other sites More sharing options...
Screaming_Rabbit Posted June 24, 2004 Report Share Posted June 24, 2004 For motorized knobs you'll also need a touch sense.I think it's easier to take "rotary motor-driven potentiometers" from Alps and implement them with the existing "MF"-Setup.Roger Quote Link to comment Share on other sites More sharing options...
Fx3_hdrive Posted July 2, 2004 Author Report Share Posted July 2, 2004 now maybe you are all right but what is ill tell you that when i spin my stepper one step, it slightly lights up an LED with a resistor? and when i connect it to my oscilloscope it gives of a nice sine wave (maybe a pulse).the whole point of this is to make it as cheep (and homemade) as possible, i know that you can buy quality rotary M encoders. why dont you buy a whole midibox for 300 quid.thanks Quote Link to comment Share on other sites More sharing options...
Fx3_hdrive Posted July 2, 2004 Author Report Share Posted July 2, 2004 just minutes later...i've fount a bit of text on that web site :In the original we had R at 100K and C as 470n: the circuit responded as low as 1/3 r.p.m. You will have to reduce C for higher output frequencies.now is this not enough: 1/3 rpm ? its enough for me !! Quote Link to comment Share on other sites More sharing options...
Twin-X Posted July 2, 2004 Report Share Posted July 2, 2004 why dont you buy a whole midibox for 300 quid.thanksSimply because you cannot buy one for that price with as much functionality/diversety as the midibox. Quote Link to comment Share on other sites More sharing options...
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