Cgs synth

Honestly.... I think I had it right the first time around. It is working and I didn't do anything.... seems that the internal clock signal is only present at the CLK-O pad when a trigger signal is sent to the module. That wasn't the behavior I was expecting when I was testing the module. I assumed that the clock was free running :-/ Oh well, it works :) That's all I care about!!!

Awesome module Ken!!

Now on to wiring up my CV Cluster, followed by 2 osc's, a sub osc, & 2 steiner filters :)

-Jim




________________________________
From: "sasami@..." <sasami@...>
To: cgs_synth@yahoogroups.com
Sent: Sunday, April 5, 2009 6:49:57 PM
Subject: Re: [cgs_synth] Burst Generator; Internal Clock Problem....


The first thing I would so is remove the diode connected to pin 5 of the
40106. That will let the oscillator free run. If you are trying to do any
tests with the generator in its "hold" state, the oscillator will not run.

Ken

>Lance, I don't think that is correct. The middle lug is is not soldered to

ground, it is soldered to the one of the two pot pads (middle to the 47k,
center to the diode & 22k), if I were to bridge the other lug to center,
then I would have a constant resistance of 2Meg between those components -
i.e. CW would be 1.5 and CCW would be .5, or CW = .85 & CCW = 1.25 etc....
Right?

>
>Does that sound right, or am I doing something wrong? From the looks of the

schematics, only one side lug and the center are used, and the 3rd is tied
to anything.

>
>Thanks for the help,
>Jim
>
>
>
>
>___________ _________ _________ ___
>From: lance iden <lance.iden@gmail. com>
>To: cgs_synth@yahoogrou ps.com
>Sent: Sunday, April 5, 2009 9:36:59 AM
>Subject: Re: [cgs_synth] Burst Generator; Internal Clock Problem....
>
>
>James. I think that on your speed pot your open terminal needs to be tied to
>the center terminal. Just a thought.Lance
>
>On Sat, Apr 4, 2009 at 8:47 PM, James Elliott <johans121@yahoo. com> wrote:
>
>> Hello,
>>
>> Newbie here....
>>
>> I just got through building the Burst Generator and everything seems to be
>> working fine except for the internal clock. It doesn't seem to be
>> oscillating. I've spent the last 3 hours looking it over & honestly I'm too
>> much of a newbie to even know how to properly troubleshoot this beyond the
>> basics.
>>
>> -All resistor & capacitor values are correct
>> -All diodes are oriented correctly (and are the correct type)
>> -Solder connections have been checked for connectivity between pads
>> -I am using a 2Meg pot for the internal clock's speed - only two wires
>> soldered, one to the middle lug, and another to a side lug. Both wires are
>> going to the "pot" pads on the PCB
>> -pin 6 of the 106 seems to stay high all the time
>>
>> I do have a scope, and I've tested everything out with an external clock
>> and I can see that the main bulk of the circuit is working.
>>
>> Can someone give me some tips on where to start looking?
>> Also, can someone please explain to me how the clock works so I can make
>> sense of it for future applicaions?
>>
>> Thanks,
>> Jim
>>
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>>
>>
>>
>
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>----------- --------- --------- -------
>
>The CGS Modular Synth home page: http://www.cgs synth.net/
>Yahoo! Groups Links
>
>
>
>

____________ _________ _________ _________ _________ _________ _
Ken Stone sasami@hotkey. net.au otherunicorn@ virginbroadband. com.au
Modular Synth PCBs for sale <http://www.cgs synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze net.au/~sasami/>







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