[sdiy] Rays modules ==8-O

[Scott Gravenhorst]

>> 
>> Hello Group,
>> I've decided to cut out some of Ray's modules on my board mill but the VCO
>> skeers me.
>> Can anyone provide me with the appropriate tempco?
>> I don't want to hunt them down only to have to order a thousand of them.
>> Also will I have a hard time find LM13600 I.C.'s?
>> I was actually thinking of the simpler 4069 osc but it lacks the sync, PW
>> and other features I would really like. Could they be implemented in the
>> 4069?

PWM (not sure what PW is in this context) is already provided, assuming you
are referring to the René Schmitz circuit.  As for sync, I'm inclined to
believe it's possible.  The control for reset is the schmitt trigger which is
composed of two inverters.  If were to dive in and make an experiment, I
would think that it could be done.  My guess would be to substitute the right
most inverter of the schmitt trigger pair with either an AND gate or an OR gate.

Perhaps Mr. Schmitz will pipe in here, I'd like to know if this is possible
and exactly how to do it as well.


>> Is there a simpler osc that has these features only simpler to build? I am
>> really not concerned about temp stability.
>> Finally, would I be able to use rotary switches to "patch" them together?
>> 
>> (Oh my gosh, I need a Valium!)
>> 
>> Sorry for all the ?? and as always
>> Thanks
>> 
>> Jim



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