Doepfer

Hi folks using the A-152 with a cv input immediately gives rise to the
need for a trigger on address selection. I'm thinking a socket for
this could fit at the bottom of the dig outs section. Has anyone done
this?

Another thought is a difference or differentiator module that could
generate triggers on discontinuities. Something like this could be
built from an analog shift register and a comparator, I suppose!

Thanks,
Doug

> Hi folks using the A-152 with a cv input immediately gives rise to the
> need for a trigger on address selection. I'm thinking a socket for
> this could fit at the bottom of the dig outs section. Has anyone done
> this?
>
> Another thought is a difference or differentiator module that could
> generate triggers on discontinuities. Something like this could be
> built from an analog shift register and a comparator, I suppose!
>
> Thanks,
> Doug

Not necessary :-)

Module A-152 has a non-published feature (valid for all A-152 manufactured
later than October 2004): RC4 of the PIC16F676 outputs a short 5V trigger
signal whenever the address changes. RC4 is pin 6 of the PIC16F676 and is
also available on pin 2 of the expansion connector JP6 (next to the bus
connector on the A-152 main board / board A). Attention: the signal is not
buffered/protected. You should at least add a protection resistor (~1k) if
you want to connect it to a socket. Otherwise the PIC can be destroyed.

Best wishes
Dieter Doepfer

Hi folks,

Amazing what one can learn about sine waves after a month of being off- 
line... ;-)

Not sure if this is the right place to ask, but I recently re-acquired  
my old hi-end modular DIY synth, and want to try to either resurrect  
it, or sample it for valuable spare parts. The thing got a lot of CEM  
chips in it, and I was wondering if there's a quick way to check if  
these are still okay (out of their sockets -- the PSU has been blown).  
I could save some serious bucks with a-111's when the CEM 3340's would  
still be working...

To clarify: I'm still on "idiot level" in regards to electronics DIY,  
but have some basic measuring equipment (DMM) available.


Thanks !

_guy

> Hi folks,
>
> Amazing what one can learn about sine waves after a month of being off-
> line... ;-)
>
> Not sure if this is the right place to ask, but I recently re-acquired
> my old hi-end modular DIY synth, and want to try to either resurrect
> it, or sample it for valuable spare parts. The thing got a lot of CEM
> chips in it, and I was wondering if there's a quick way to check if
> these are still okay (out of their sockets -- the PSU has been blown).
> I could save some serious bucks with a-111's when the CEM 3340's would
> still be working...
>
> To clarify: I'm still on "idiot level" in regards to electronics DIY,
> but have some basic measuring equipment (DMM) available.
>
>
> Thanks !
>
> _guy

The easiest way is to order an A-111-1 without CEM3340 and try which of the
CEM3340 are working. I'm confident that at least one will be working. Of
course you could built a circuit to test the CEM3340 but that's about 80% of
the A-111-1 circuitry.

Best wishes
Dieter Doepfer

Thanks, Dieter !

If only to prove my point that I'm an idiot... I have several A-111's  
[with decent sines!], and of course it never occurred to me to use  
them as a perfectly valid and simple 3340 testbed. Doh !

cheers,

_guy (back in kindergarten now)

> > Hi folks,
> >
> > Amazing what one can learn about sine waves after a month of being  
> off-
> > line... ;-)
> >
> > Not sure if this is the right place to ask, but I recently re- 
> acquired
> > my old hi-end modular DIY synth, and want to try to either resurrect
> > it, or sample it for valuable spare parts. The thing got a lot of  
> CEM
> > chips in it, and I was wondering if there's a quick way to check if
> > these are still okay (out of their sockets -- the PSU has been  
> blown).
> > I could save some serious bucks with a-111's when the CEM 3340's  
> would
> > still be working...
> >
> > To clarify: I'm still on "idiot level" in regards to electronics  
> DIY,
> > but have some basic measuring equipment (DMM) available.
> >
> >
> > Thanks !
> >
> > _guy
>
> The easiest way is to order an A-111-1 without CEM3340 and try which  
> of the
> CEM3340 are working. I'm confident that at least one will be  
> working. Of
> course you could built a circuit to test the CEM3340 but that's  
> about 80% of
> the A-111-1 circuitry.
>
> Best wishes
> Dieter Doepfer

Hi Dieter, yay! Thanks, Doug


--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
> > Hi folks using the A-152 with a cv input immediately gives rise 
to the
> > need for a trigger on address selection. I'm thinking a socket 
for
> > this could fit at the bottom of the dig outs section. Has anyone 
done
> > this?
> >
> > Another thought is a difference or differentiator module that 
could
> > generate triggers on discontinuities. Something like this could 
be
> > built from an analog shift register and a comparator, I suppose!
> >
> > Thanks,
> > Doug
> 
> Not necessary :-)
> 
> Module A-152 has a non-published feature (valid for all A-152 
manufactured
> later than October 2004): RC4 of the PIC16F676 outputs a short 5V 
trigger
> signal whenever the address changes. RC4 is pin 6 of the PIC16F676 
and is
> also available on pin 2 of the expansion connector JP6 (next to 
the bus
> connector on the A-152 main board / board A). Attention: the 
signal is not
> buffered/protected. You should at least add a protection resistor 
(~1k) if
> you want to connect it to a socket. Otherwise the PIC can be 
destroyed.

> 
> Best wishes
> Dieter Doepfer
>