[sdiy] clock Divider

[Harry Bissell & Nora]

The 4000 series CMOS parts

CD4024 or CD4040

will do what you want.  You can run them on any
single supply voltage up to 18V (max) so +12 and +15
are good.

The threshold voltage should be about 1/2 the supply voltage...
8 volts in would work with the +12 volt suppt but marginal
on the 15 volt supply.

I would put a large resistor in series with the clock input
(maybe 100K) to protect against negative voltages (diodes inside
the chip will clamp the signal to safe levels).  It would be better
to use external clamping but this is quick and dirty.

I'd put like 1K ohms in series with the outputs so that you dont
kill the chip by shorting the outputs to grouns, the positive supply or
even worse, negative supply.  If this is not enough, then you might need
transistor or opamp buffers on the output.  LM324 as voltage follower
would work really good and you get four to a package.

I would look at the data sheet and see if you can figure this out
for yourself. Its really quite straightforward and an excellent first
step to doing original design.

oh and one more thing... "Solderless Breadboards SUCK !!!"  :^P

H^) harry


Harry Bissell loves Nora Abdullah
Married Nov 6th 2006

--- Scott at scottwick.com wrote:

From: "Scott" <Scott at scottwick.com>
To: <Synth-diy at dropmix.xs4all.nl>
Cc:
Subject: [sdiy] clock Divider
Date: Fri, 6 Jul 2007 10:03:48 -0500

Im looking for a simple circuit to divide down a clock signal, but can't
find one.  I just want something that will /2 /4 /6 /8 /16 /32.  I don't
need anything fancy.  Can someone point me in the right direction?

While Im writing, I also have an issue where some things  are much more
sensitive to others for the clock input.  Some of my modules will
trigger w/ just about anything at the input, and others are very picky,
or need a very large signal.  I know this is about as basic as it gets,
but does anyone have any schematics out there for a simple circuit that
will take the trigger signal from my midi/cv (which is putting out about
8v) and bring it up to 10 or more volts?

Just so you know my skill level (or lack there of), I've built a big
synth, but it's all other peoples designs.  I've gotten good at
troubleshooting circuits, and can find my way around a schematic.  My
breadboarded circuits rarely work, but that may be the fault of my 10
year old breadboard w/ worn out contacts, because the same circuit
usually works when I print up a PCB..  Anyway, I think the divider and
something to bring my trigger signals up should be quite simple.  I
tried building a divider last night, but nothing came out of it, SO,
time to ask for some help.

Thanks a lot!

If anyone cares to see the synth Ive made, I started a page at
www.sdiy.org/wicked1

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