Gate Triggers don't properly trigger...

This is the output of Trig-1 of Nava.

It seems to be alright, with 5V peak and at an interval of 124ms which is 120bpm, pulse width 2ms.

This is the output of clock Out of Drumbrute.

With a lower peak of 3.75V and also at 124ms interval, pulse width 62.2ms.

The only different is the duration 2ms vs 62ms. It seems that my Nava's trigger out is way too short. So the SH-101 may miss out some beats due to this reason.

The circuit seems to be okay. Just that the duration is not. Can the pulse width be increased? Is it software tweakable?

truman_k@yahoo.com wrote:Okay, can the pulse width be increased? Is it a software problem?

Hi truman, thanks for the pics!

It seems that trig is indeed 5V and not that 0.07V you mentioned before? How did you measure it before?

As far as my (limited) experience goes, 1ms seems to be quite a normal pulse-width just for a trig these days, and the Nava seems to be doing 2ms.

However, viewtopic.php?f=16&t=187#p2002 here it's mentioned that the original 808 trig was 20ms 15V pulse. So indeed you might want a bit longer pulse to clock the SH-101 nicely.

If you wanna test around, http://electronics.stackexchange.com/qu ... 0691#30691 here's a schematic for a simple pulse extender. Add an op-amp and you can boost the voltage too

Here's AGCG fooling around with an 8 and two 1's https://www.youtube.com/watch?v=sfKzHpsQkxo

So good!

As far as I know the pulse width is controlled with the software and there could be a setting for it in the future but don't hold your breath yet for this feature

I was using a multimeter to test it at first. It seems that the multimeter cannot catch the 2ms pulse. So it reads 0.07v all the time. And that makes me think that my circuit is going wrong. Fortunately, Bastien asked me to use a scope to track it. So here are the results.

Hope that the next software update can increase the length of each trigger pulse.

Thanks all for the help.

Truman

p.s.
Here is one more pic for the Yocto trigger out. Just in case someone is interested

Yocto can trigger the SH-101 with no problem. So a healthy 5.20ms pulse is good enough to do the trig.

truman_k@yahoo.com wrote:I was using a multimeter to test it at first. It seems that the multimeter cannot catch the 2ms pulse. So it reads 0.07v all the time. And that makes me think that my circuit is going wrong. Fortunately, Bastien asked me to use a scope to track it. So here are the results.

Hope that the next software update can increase the length of each trigger pulse.

Thanks all for the help.

Truman

p.s.
Here is one more pic for the Yocto trigger out. Just in case someone is interested
<cut the pic>
Yocto can trigger the SH-101 with no problem. So a healthy 5.20ms pulse is good enough to do the trig.

Thanks for the research truman!

Yeah, a multimeter can't really figure out what is the true voltage of a signal where the pulse-width is not 50%.

I just got the Yocto flashing nicely so development is finally moving on. Once we fix a bunch of bugs we should start a feature-request thread similiar to the bug-threads we have now.

Best,
Pekka.