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 Forum index » DIY Hardware and Software
Sequencer pulse width
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anclib



Joined: Oct 12, 2012
Posts: 11
Location: UK

PostPosted: Wed Jan 22, 2014 10:18 am    Post subject: Sequencer pulse width Reply with quote  Mark this post and the followings unread

Hi, does anyone know of a circuit for altering the pulse width of a sequencer's steps? preferably something simple and without comparators, could a 555 could be used maybe, or is there something even simpler?
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J3RK



Joined: Jun 05, 2006
Posts: 99
Location: Seattle

PostPosted: Wed Jan 22, 2014 10:59 am    Post subject: Reply with quote  Mark this post and the followings unread

You could make a simple gate to trigger converter using a couple of resistors and a capacitor and a diode. (I'll see if I can draw one or find an image.) This would be just a very short pulse/spike though, so if you just wanted a short full gate signal, you might want to try something else.

You could trigger a monostable (which a 555 can be set up as). There are some CMOS monostable chips as well, and you can also build one with a couple of transistors a cap and some resistors. Look up transistor monostable.

I have a sequencer design that uses a series of flip flops to drive some counters and a multiplexer. I wanted to shorten the individual gate outputs, so I used 8 AND gates, and ANDed the gate outputs with a signal from one of the flip flops, which cut the gate lengths in half. This sort of approach would depend on how your sequencer is driven/clocked though. Just pointing out that there are quite a few ways you might do this.

This may be helpful: http://www.electronics-tutorials.ws/waveforms/monostable.html
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anclib



Joined: Oct 12, 2012
Posts: 11
Location: UK

PostPosted: Wed Jan 22, 2014 11:13 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks, my sequencer is just a simple shift register type with the 555 clock, so the register is just detecting the rises in the 555 input pulse. I was thinking maybe of a envelope instead of gate length but its probably a little to complicated and would cause attenuation problems in the cv output.
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ryktnk



Joined: Apr 24, 2008
Posts: 196
Location: london
Audio files: 1

PostPosted: Thu Jan 23, 2014 1:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hello

The easiest way is starting with a sawtooth vco and slicing ( sorry comparator )
the waveform.

Check out Renne's 4069 VCO, it is a one chip solution.

-ryk
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roglok



Joined: Aug 28, 2010
Posts: 163
Location: uptown

PostPosted: Thu Jan 23, 2014 4:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

you also might want to check out ian fritz's delayed pulser:

http://electro-music.com/forum/post-151463.html#151463
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anclib



Joined: Oct 12, 2012
Posts: 11
Location: UK

PostPosted: Sun Jan 26, 2014 10:57 am    Post subject: midi to gate circuit Reply with quote  Mark this post and the followings unread

Hi thanks for your helpful replies, it much appreciated.


Hello, does anyone know of a circuit for simple inexpensive midi to gate,

I am not interested in midi to CV, just the gate so I can sync analogue sequencer.

Ideally something that is very cheap and easy that I can put together myself.
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isak



Joined: Dec 13, 2009
Posts: 725
Location: Israel
Audio files: 18

PostPosted: Tue Jan 28, 2014 2:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

You can do it with arduino, it's cheap and easy to make.
I just need to remember where I put the code Rolling Eyes

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