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Re: [dotcomformat] doepfer clockdivider in dotcom format

2005-06-09 by john mahoney

> > The A-161 has only one chip -- a CD4024 -- and the rest is
> > discrete. The A-160 has a CD4017 plus discrete parts. They should
> > work fine on +/-15V.
>
> OK, lets just cut to the chase here on this clock divider.  Unless
> you already own one, conversion is a waste of money.  The PCB and
> electronic parts are worth less than $10.  The rest of it (the
> expensive parts) the panel, jacks and such you have to replace
> anyhow.

True. If you are a DIYer, you don't need these modules. For those who want
kits, Ken Stone covers some of this ground, and MOTM panel designs exist.
Example: http://www.wiseguysynth.com/larry/panel/gif/cgs_div_bool.gif


> This is a dirt simple circuit.

One notch above a Forrest Mim's book. ;-)


> As John pointed out, it has only one
> chip.  I imagine he is using transistors for the output drivers in
> switching mode.

Right, like Ken Stone does on his pulse divider:
    http://www.cgs.synth.net/modules/cgs36_pulse_divider.html

As for the Doepfers, the A-161 Gate Sequencer has no front panel inputs, 8
outputs and 8 BC547 trannies, thus one per output. But the A-160 Clock
Divider seems to have more transistors than outputs. It doesn't really
matter -- I don't need to know how these Doepfer modules work, I'm just
commenting since it came up.


> So, I imagine if you run it on 15V you will get
> higher voltage swing on the outputs.

Would this higher voltage be a problem? This is obviously a common
technique. Hmmm... Are different resistor values needed around the buffer
trannies, depending on the power supply voltage?


> If you have any building skills at all buy the Blacet Binary Zone.
> It is a far more interesting and versitale module than a simple clock
> divider.  OK, I realize it does not have individual outputs.

The BZ looks cool, but the individual outs are what I want this for.


> But,
> they are very simple to add if you like.  John will even sell you the
> "basic version" of the module which comes without panel, knobs, jacks
> and pots.

It's so cool that he does that.


> > I'd take panels for one A-161 and two A-160s, since I have them
> > already. But I'd like more of the Doepfer clock and logic modules,
> > or the same type of panels for DIY modules.
>
> Give us an idea of what you want on the panel.  We can do it.
> Larry

Great, but I might want it in MOTM format! (Oops, wrong list... ;-)

Who does the panel designs and artwor, anyway -- the buyers or the Stooges?
--
john

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