thanks for the help!

[Eduardo Saponara]

Thanks for the explination on grounding guys,  and thanks for the info on
the 555 ic,  I seem to remember some 555 cookbook thing on the web
somewhere, so I'll have to snoop around to see just how to wire it.

thanks again.



----- Original Message -----
From: Hairy Harry <paia2720 at hotmail.com>
To: <mitch at sirius.com>; <efm at xavax.com>; <synth-diy at node12b53.a2000.nl>
Sent: Saturday, October 14, 2000 1:17 AM
Subject: Re: Sequencer success!


> Hi Mitch.
>
> Yes... you could put a resistor in series with the high side of each
> pot...
>
> ~or~
>
> CMOS can run on voltages from about 3 to 18 (MAX) volts... if you
> wanted less range you could slap a 5V regulator on the supply comming
> into the PCB.  Or any other voltage you wanted between 3 and probably
> 12V (assuming you use a 15 volt supply...).
>
> H^) harry
>
>
> >From: Mitchell Hudson <mitch at sirius.com>
> >To: EFM Synth DIY <efm at xavax.com>, Synth DIY
<synth-diy at node12b53.a2000.nl>
> >Subject: Sequencer success!
> >Date: Fri, 13 Oct 2000 04:37:07 -0700
> >
> >     So the beginners have done it again! Yep they've found the simplest
> >most basic 8 step sequencer they could find, put it together and it
> >mostly works! Two IC's, one transistor and three resisters not counting
> >the front panel components.
> >
> >     I do not remember where I found this schematic, if anyone recognizes
> >this one let me know. I put a copy of it here
> >
> >www.webdevils.com/schematics/SEQ8.jpg
> >
> >     I put this together on a perfboard from radioshaock and made a front
> >panel from a two unit frac panel. I left some room on the panel for one
> >more knob and a couple of extra jacks so I can add a clock at a later
> >date.
> >
> >     There are a few things that need improvement. It has one small
> >problem with the up/down switch. When switched the sequence runs
> >backwards and stops. Not sure what the problem is, I am assuming of
> >course that the sequence should not stop but repeat backwards when the
> >switch is down. everything runs fine in the forward direction.
> >
> >     The output seems a little high, I am assuming there is a range of +
> >a small amount of volts up to +15V. Initial tests using the sequencer to
> >control my VCO, through the v-oct, seem to show that the knobs are only
> >useful for about half of their range. The rest of the range being too
> >high or too low depending on the initial pitch of the VCO. Seems what I
> >really would be looking for would be a range of 0 to +10V? I am thinking
> >there is probably a way to scale the output down a bit with a resister
> >maybe. Though for some reason my beginner instincts are telling there
> >should be an op-amp involved because these things seem to end up in
> >everything and this circuit doesn't have one, yet.
> >
> >     I had the idea that if I built a clock with two outs that flip
> >flopped. I could build a second simple 8 step sequencer and clock each
> >from one of the outs of the clock and get 16 steps out of the two...
> >
> >Thanks
> >
> >--M
> >
>
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