Sequencer pulse width

[anclib]

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?

[J3RK]

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

[anclib]

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.

[ryktnk]

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

[roglok]

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

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

[anclib]

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.

[isak]

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