Cgs synth

>Well don't I feel ashamed. It is a MC74HC4046N. Good news because

everything else on the module was quadruple checked and looked and tested
fine. I sure love sockets at times like this.

You need the common old CMOS version - CD4046 or MC14046 or similar. The 74
variants are designed for a maximum of 5 volts, which is why they go bad.

>As for the behavior of the DS1 out, will that be affected by the wrong chip

or is the behavior previously described normal?

No. I suggest you either have a bad solder joint, or wrong value resistor,
in particular the 2k2 to ground from the driver transistor.

>Does using the one GND by CV to all points on the panel needing grounding

have any adverse effects on performance? Thanks Ken for the advice and great
PCB!!!

Grounding as described is perfectly fine. I do exactly the same thing. Other
ground connections are merely for convenience, for those who wish to run
extra wires for whatever reason.

Ken

>sasami@... wrote: It isn't an

MC4046 or a 74xx4046 (where xx will be some other letters) is

> it? If so, you have the wrong chip.
>
> >Hi all,
> >
> >I just built my digital noise and the 4046 keeps smoking when I plug it in,
> after getting hot within the first couple seconds of being on. I have check
> for shorts, wiring issues and the like with no discoveries. Any ideas?
> >
> >When using an external clock the unit is fine. Something strange though;
> the LED for DS 1 only lights up when I plug a jack into the output socket.
> Weird. DS 2 LED flashes just fine with no jacks plugged in.
> >
> >I can unplug the 4046 and the module still works with an external clock. I
> know the issue is only with the clock section, but the "lighting only when a
> jack is plugged in" activity of DS 1 LED makes me wonder about other

problems.

> >
> >As for the GND wiring, I used the GND PCB point by the CV and CLK PCB
> points to ground the jacks and speed pot. Should I be using the GND points
> by DS1 specifically for something. As it stands, they are unused.
> >
> >Thanks for any help and advice.
> >
> >
> >
> >
> >Thomas White
> > Natural Rhythm
> >www.naturalrhythmmusic.com
> >
> >
> >---------------------------------
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> >
> >[Non-text portions of this message have been removed]
> >
> >
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> __________________________________________________________
> Ken Stone sasami@... or sasami@...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
>
>
>
>
>
>Thomas White
> Natural Rhythm
>www.naturalrhythmmusic.com
>
>
>---------------------------------
>Stay in the know. Pulse on the new Yahoo.com. Check it out.
>
>[Non-text portions of this message have been removed]
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>
>

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