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harpz

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Posts posted by harpz

  2. TKD Motorfaders

    in Parts Archive

    Posted · Edited by harpz

    hello

    I've been playing around with alps faders recently, using 32khz pwm to keep them quiet, at slow speed they are not that smooth, very uncertain. i am not sure as to the reason? it might be the fader is a bit warped? or the pwm is distorted ( i have no oscilloscope to check)

    The tkd MVH2-6101 are aprox £50 ( from what i have heard) I wonder if they are more smooth and even and better made? the alps i have were aprox £25. i may try other frequencies and higher voltages to give the PWM more bite. my fader is rated at 10v 800ma , i am using 10v as my supply into a h -bridge. As i am using pwm, maybe i can up the volts to 12v? as long as i do not give it 100percent duty cycle. that may help give more bite and power at lower speeds:? shall give it try.

    wow, did you get a free sample from tkd?

  5. touch sense circuit?

    in Design Concepts

    Posted

    hi, thanks for your reply.

    I forgot to mention, I have made my own servo type circuit/software(using max msp) to control the fader.

    it works o.k, but I was looking for a little touch sense schematic that I might be able to incorporate into my design.

    perhaps the touch sense circuit would output a logic 5v so that I could trigger a relay to turn off the motors power.

    I haven't used the midibox as of yet, is the DINXx part of this? sorry if that's a daft question. : P

    thanks : )

  6. touch sense circuit?

    in Design Concepts

    Posted · Edited by harpz

    hello : ) I wonder if anyone can help?

    I have been trying to figure a way to create a touch sense circuit for a motor fader. I tried a transistor capacitance type circuit and it worked well with a small wire connected to base, but when I connected it to the touch fader connection the circuit would not turn off , even if i stood back away from the fader.

    i cannot find a qt100 IC (touch sense ic). or any IC that i can solder to my vero board ( or test in my breadboard)

    I am so lost on what to do , i wonder what you guys do to cut the motor faders power when you touch the fader?

    thanks for any help or pointers.

    harpz : P

    ( edit= I am using an alps fader)

  7. Motorized Analog Faders before Summing Box

    in MIDIbox HUIs

    Posted

    I did some more searching on the site and found a similar project to what I'm trying to accomplish.

    Here's the link

    http://www.midibox.org/forum/index.php?topic=6061.0

    The difference between this idea and my own is that I will need 24 inputs and outputs rather than just 8 inputs. And there's no need for me to sum up the tracks into a stereo L and R output because I'll have a Folcrom following the Midibox.

    My main goal is to preserve the quality of the audio while being able to control the volume from Sonar via Midi through a simple midibox design. 

    What IC's would be best suited for this application?

    hi JB872, did you manage to sort out your module? I know this was a few years ago,but I just found this amazing site via google.

    i am about to build a flying fader set up myself. i just purchased a single motorized fader to see how it works. and plan to controll via an arduino microcontroller. or maybe one of these midi boxes?

    so i wonder how you got on.

    peace : )

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