Analogue systems

Thanks Peter, that's exactly what I was looking for and more. I do 
believe my PSU uses Molex connectors.  I'll be attempting to power up 
a Wasp filter, which I don't think needs the 5volt supply but I'll 
check on that.  I'm guessing, since its a ribbon cable, that there is 
a red mark to indicate pin 1?  I don't have the module yet so I'll 
have to wait and see.
Thanks again for your response.  Very helpful tips!
Joel




--- In analogue_systems@yahoogroups.com, Peter Grenader <peter@b...> 
wrote:
> OK, I can answer this for you, but please *listen* closely for your 
own
> module's safety.  Depending on the shunt fold back protection of 
your PSU,
> getting them reversed may require you to change all of the 
semiconductors in
> the effected devices.  I say this only because I enjoy (for lack of 
the real
> word) dyslexia and am constantly getting things like this reversed.
> 
> The Analogue Systems modules get their power via a 16 pin dip 
socket (IC
> socket).  What they've done is rather clever, double-doubling up 
the four
> voltages in groups of four wires each of a standard ribbon cable, 
thus
> allowing for very easy power distribution without compromising the 
current
> limit of the comparatively small gage wires of the ribbon itself.
> 
> The power distribution and four pin groups on this socket are as 
follows:
> 
> Group 1 (Ground): pins 1,2,16,15
> 
> Group 2 (+12):  pins 3, 4,14,13
> 
> Group 3 (+5 - see footnote): pins 5,6, 12,11
> 
> Group 4 (-12): pins 7,8, 10, 9
> 
> These pin outs are identical on all A Sys boards.  Note that +5 
will not be
> required on every module you purchase and you should consult A. Sys
> regarding which may be effected.  All modules that have a LCD 
display will
> require it and there are more as well without displays.
> 
> If you don't wish to deal with the ribbon cable, I use what's 
called a 'surf
> board" connected to only one side of the DIP socket (either pins 1 -
 8 or 9
> - 16), as it will allow for thicker gage wires and eliminate the 
need to
> double them up.  It also makes it a hell of a lot easier to 
terminate the
> other end to a four pin Molex, which I think you're describing here.
> 
> One thing I suggest - once you've connected it, BEFORE YOU LIGHT IT 
UP, test
> these connects at THEIR SOURCES.  Buzz out the four voltages FROM 
THE POWER
> SUPPLY TERMINALS to LOCATIONS ON THE MODULE'S PCBA WHERE YOU ARE 
CERTAIN
> THESE VOLTAGES ARE ROUTED.  For instance,  an ohm meter,  beeper or 
wire
> continuity tester from the positive 12 volt terminal on the PSU to 
pin 4 of
> any TL074 or 084 IC.  From the negative 12  terminal of the PSU to 
pin 11 of
> the same IC.  If you're getting continuity at those two places, you 
can be
> certain ground is going where it should.  If it isn't at least the 
module
> won't blow, it will just not allow for a return (current flow) and 
the thing
> simply won't turn on when power is applied.
> 
> On TL072's and 82's, which are quite common on A. Sys modules,. +12 
is found
> at pin 8 and -12 at pin 4.  Doing this allows you to test your Molex
> termination -and- your DIP socket end at once.
> 
> Make sure to wear a ground strap when sniffing around PCBAs.  There 
could be
> CMOS afloat, just waiting for tha fateful discharge.
> 
> Hope this helps.
> 
> - Peter
> 
> 
> 
> 
> terrymcfrench wrote:
> 
> > Hi,
> > 
> > Does anyone have the pin setup for AS modules?  I have an american
> > PSU (4 pin) but I'd like to get some AS modules.  Doepfer has 
their
> > pin setup on their website so you can figure out what you'd need 
for
> > the conversion, but so far I haven't been able to find that info 
on
> > the Analog Systems site.
> > I'd appreciate any help.
> > Thanks
> > 
> > 
> > 
> > 
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