hihat pot

[estregan]

Hi Dmitri,

What value of pot does the hihat input use? Roland uses 25K while Admir's e-drum uses 100k. Thanks.

[dmitri]

Both will work.

[dmitri]

On a second thought, 100k may be too much. Anything between 4k7 and 25k should work fine.

[ignotus]

I use 100k and it works fine.

[jodev]

Hi ,
I use the optical controller of Admir (e-drum) it functions really well.

jodev

[dmitri]

Hi ,
I use the optical controller of Admir (e-drum) it functions really well.

jodev

And it should, because it has low output impedance. I use a variation of Admir's design with a phototransistor instead of a photoresistor (I had bad delay with photoresistor).

[ignotus]

Hmm , maybe I was a bit quick with that reply - at a first glance it worked fine, the slider on the screen went up and down accordingly with pedal movement, but at half position, when I start hitting the hi hat pad, the level starts wobbling up and down, as if it had trouble staying put when the pad gets a signal. As I said I have a 100k pot in the pedal - is there a way of getting closer values to what you recommend by changing resistor values anywhere, should I change the pot (something I'd preferably avoid), or could it not be that at all?

Thanks!

[dmitri]

Hmm , maybe I was a bit quick with that reply - at a first glance it worked fine, the slider on the screen went up and down accordingly with pedal movement, but at half position, when I start hitting the hi hat pad, the level starts wobbling up and down, as if it had trouble staying put when the pad gets a signal. As I said I have a 100k pot in the pedal - is there a way of getting closer values to what you recommend by changing resistor values anywhere, should I change the pot (something I'd preferably avoid), or could it not be that at all?

Thanks!

Since MegaDrum has low impedance inputs it will work best with low output impedance HiHat controllers. If there is no way to use a low impedance potentiometer, than the only way to make a HiHat controller to work properly is to put an OpAmp repeater, e.g. LM324, between the pedal output and the HiHat controller input.

[ignotus]

Since MegaDrum has low impedance inputs it will work best with low output impedance HiHat controllers. If there is no way to use a low impedance potentiometer, than the only way to make a HiHat controller to work properly is to put an OpAmp repeater, e.g. LM324, between the pedal output and the HiHat controller input.

OK, I actually have a few of those lying around ((LM324) - so I'd use one of the four channels it has, and connecting it to 5v. and ground?

Thanks for the help!