Cgs synth

Check that pin 9 of the 4070 really does go to +ve. It may be floating.

Ken

>Thanks very much Ken.
>
>There's continuity between the 4070 pin 8, and the 4024 pin 12, and I

replaced the jumper that's in the path just to make sure it wasn't those
joints.

>
>There is also some anomalous behaviour in the div4 outputs. instead of

being properly offset in phase, 3C & 2B go high/low together, and 3A & 2D go
high/low together 180 degrees offset from 3C & 2B.

>
>The div8 and div16 outputs appear to be working fine.
>
>Thanks again,
>Mattew
>
>
>
>
>--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>>
>> The fault would be with a bad connection between the 4070 (pin 8) and the
>> 4024 (pin 12). Possibly a missing link, or a bad joint or break in the
>> track. The counter is working fine if all other outputs are behaving.
>>
>> Ken
>>
>> >i recently built the cgs master divider, and am having trouble isolating a
>> couple of problems (possibly one problem with two symptoms).
>> >
>> >everything works fine, except: 2A stays at 5v, and 2C stays at 0v. the
>> other "2" divisions work fine.
>> >
>> >i swapped out the transistors related to those outputs, as well as swapping
>> the 4070, no change. continuity has been checked from the output at the
>> jack/led to the chips. the leds light/jacks work when plugged into other
>> outputs.
>> >
>> >i'd be appreciative of any suggestions for further investigation, and
>> welcome the opportunity to learn from whatever mistake i might have made (or
>> from the remote chance that a part may be defective).
>> >
>> >thanks,
>> >matthew
>> >
>> >
>> >
>> >------------------------------------
>> >
>> >The CGS Modular Synth home page: http://www.cgs.synth.net/
>> >Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> _______________________________________________________________________
>> Ken Stone sasami@... otherunicorn@...
>> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>>
>
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>

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