[sdiy] sequencer ideas

[Mitchell Hudson]

    I built that sequencer at the link you have there. It works pretty
well and was not hard to make on generic PCB from radioshack.

    I had a problem with it and asked the list for some suggestions and
someone pointed out that there were some problems with the circuit in
the reset pulse input and one of the pins is not wired correctly on the
4516 chip. I can't remember what this was though.

    I have another Schematic that goes with this one that shows how to
wire LEDs or an 8 segment display to the seq8 circuit.

http://www.webdevils.com/schematics/seqdisp.jpg

    I can't remember where I found these schematics, so I posted them to
my site. There was also some suggestions to use the enable pin of the
4051 and the 4th bit of the 4516 to chain two of these together.

--M

Tavys Ashcroft wrote:

> I have a pair of Boss RSD-10 sampler/delay units, and I want to make
> a sequencer for them.  The really nice feature about them is the
> keyboard jack on the back that takes a square wave input and uses
> that frequency to determine the playback rate of the sample.  So I
> can record a sound into it and play it back at, really, any rate (it
> says two octaves, but I get much more than that out of it...down to
> the crunchy rumbles).
>
> I want to make a sequencer (8 or 16 step) similar to the one here:
>
> http://www.webdevils.com/schematics/SEQ8.jpg
>
> But I plan on having each step have it's own 555 osc with both pitch
> and on time controls.  I want to be able to have little short blips
> down to the full length of the step.  Is this just a matter of using
> a pot to set the RC time constant of the 555, or will I need a second
> one in there for that?
>
> The RSD-10 also has a gate input along with the keyboard input, so
> maybe I should utilize that for the triggering, using a separate
> one-shot 555?
>
> Also, how difficult is it to string together two of these 8 step
> sequencers to make one 16 step..or is there a better way of doing it?
>
> -Tavys