Doepfer

Hello list,

I just bought an A-185-2 precision adder and an A-164-1 manual gate, but neither one seems to be sending signals to the bus.  I have an A-111 on the same bus as the 185-2 in a Doepfer suitcase, and an A-140 on the same bus in a Base Case, but neither one of them is responding.  The modules are working if I patch them.  I've never tried to use the bus before.  Is there something I need to do to prepare the bus?

thanks,
Ernst

Hi Ernst,

The A-185-2 has a jumper J5 which needs to have the link connecting the two lower pins to get CV out to the bus. The A-185-2, unlike the A-185 does not have a gate bus connection so the A-140 will not get triggered. Also if you have multiple bus boards you will need to link them for the bus signals to work on all boards.

Cheers
Tony

--- In Doepfer_a100@yahoogroups.com, "E Karel" <eklkrl@...> wrote:

>
> Hello list,
> 
> I just bought an A-185-2 precision adder and an A-164-1 manual gate, but neither one seems to be sending signals to the bus.  I have an A-111 on the same bus as the 185-2 in a Doepfer suitcase, and an A-140 on the same bus in a Base Case, but neither one of them is responding.  The modules are working if I patch them.  I've never tried to use the bus before.  Is there something I need to do to prepare the bus?
> 
> thanks,
> Ernst
>

Hi,

Thanks.  But the jumper is in the correct position, and I was unclear: I'm trying to use it to send voltage to an A-111 (and the 164-1 to send gate to the A-140, both of which are on a different bus).  The A-185-2 and A-111 are on the same row/bus in a A-100P6 suitcase, but the A-111 doesn't notice the Adder at all.

Any ideas on what I'm doing wrong?
Ernst


--- In Doepfer_a100@yahoogroups.com, "synovatron" <tony.steventon@...> wrote:

>
> Hi Ernst,
> 
> The A-185-2 has a jumper J5 which needs to have the link connecting the two lower pins to get CV out to the bus. The A-185-2, unlike the A-185 does not have a gate bus connection so the A-140 will not get triggered. Also if you have multiple bus boards you will need to link them for the bus signals to work on all boards.
> 
> Cheers
> Tony
> 
> --- In Doepfer_a100@yahoogroups.com, "E Karel" <eklkrl@> wrote:
> >
> > Hello list,
> > 
> > I just bought an A-185-2 precision adder and an A-164-1 manual gate, but neither one seems to be sending signals to the bus.  I have an A-111 on the same bus as the 185-2 in a Doepfer suitcase, and an A-140 on the same bus in a Base Case, but neither one of them is responding.  The modules are working if I patch them.  I've never tried to use the bus before.  Is there something I need to do to prepare the bus?
> > 
> > thanks,
> > Ernst
> >
>

Thanks, James, that was it!  Even though I've had this A-111 for about 13 years now, and bought it new, the jumper wasn't there.  I added a jumper and now it reads the bus.

I took a look at my two (also 13-year-old) A-140s to see if there was a similar jumper, since those also aren't reading gates from my new A-164-1.  There's a place at the upper-right corner of the circuit board marked INT.GATE and J1, but there are no pins there to hold a jumper on either module.  

Very strangely, though -- strangely because I bought them both new in 1998 -- one of them has a solder blob on the back connecting the two points, and one of them doesn't.  I would think the one with the solder bridge should read the bus, but it doesn't.  It looks slightly blackened/burnt under the solder.

So, given this, any recommendations?  Should I try adding a solder bridge to the one that currently doesn't have one?

Ernst
 



--- In Doepfer_a100@yahoogroups.com, James Husted <james.husted@...> wrote:

>
 
> Did you get the A-111 new? If it was used, the prior uses may have removed the J1 jumper (upper rich corner of the PCB under the ribbon cable). This jumper has to be there for the A-111 to "see" the CV bus. 
>

Another thing to consider is that there should be NO other CV or Gate producing modules connected to the CV and Gate busses - Only ONE Gate or CV creator at a time connected to the bus. As mentioned there should be an A-100BC cable connecting the two bus boards together to make the CV span between two busses and a jumper on the CV/Gate headers on a single bus board to make the bus connect between the two halves if the A-100BC is not there (the A-100BC connects both haves and both busboards when used.

Did you get the A-111 new? If it was used, the prior uses may have removed the J1 jumper (upper rich corner of the PCB under the ribbon cable). This jumper has to be there for the A-111 to "see" the CV bus. 

There are TWO jumpers on the A-164-1 that connect Gate 1 and Gate 3 to the gate bus. Only ONE can be connected. The default is JP2 being connected which connects SW3 to the bus. 

-James



On Jul 24, 2011, at 9:51 AM, E Karel wrote:

> Hi,
> 
> Thanks.  But the jumper is in the correct position, and I was unclear: I'm trying to use it to send voltage to an A-111 (and the 164-1 to send gate to the A-140, both of which are on a different bus).  The A-185-2 and A-111 are on the same row/bus in a A-100P6 suitcase, but the A-111 doesn't notice the Adder at all.
> 
> Any ideas on what I'm doing wrong?
> Ernst
> 
> 
> --- In Doepfer_a100@yahoogroups.com, "synovatron" <tony.steventon@...> wrote:
>> 
>> Hi Ernst,
>> 
>> The A-185-2 has a jumper J5 which needs to have the link connecting the two lower pins to get CV out to the bus. The A-185-2, unlike the A-185 does not have a gate bus connection so the A-140 will not get triggered. Also if you have multiple bus boards you will need to link them for the bus signals to work on all boards.
>> 
>> Cheers
>> Tony
>> 
>> --- In Doepfer_a100@yahoogroups.com, "E Karel" <eklkrl@> wrote:
>>> 
>>> Hello list,
>>> 
>>> I just bought an A-185-2 precision adder and an A-164-1 manual gate, but neither one seems to be sending signals to the bus.  I have an A-111 on the same bus as the 185-2 in a Doepfer suitcase, and an A-140 on the same bus in a Base Case, but neither one of them is responding.  The modules are working if I patch them.  I've never tried to use the bus before.  Is there something I need to do to prepare the bus?
>>> 
>>> thanks,
>>> Ernst
>>> 
>> 
> 
> 
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
> 
> 
> 



[Non-text portions of this message have been removed]

Success!  I solder-tacked a little wire as you said on the unit that didn't have the solder blob, and it works!  Thanks again.  

No, I don't suspect that the modules left Doepfer in that condition -- it might have been something that happened with the U.S. distributor at that time, Douglas Wagner of Omaha, Nebraska.  

Great, two problems solved.  Now if anyone can help with my other query (in another thread), how to modify a 148 S&H to allow it to be triggered by the gate output of the 164-1 ....  it is strange that these modules aren't compatible.

Thanks again, James!
Ernst



--- In Doepfer_a100@yahoogroups.com, James Husted <james.husted@...> wrote:

>
> Both my A-140 have a true header/jumpers in the upper left corner marked INT.GATE J1. When the jumper is installed the A-140 connects to the bus. If yours does not have the header then a wire soldered across the 2 pads should work. There is not current enough to make a short big enough to blacken the pads - sounds like a bad solder job by someone to me. Looks like you were sold used or store demo units for new, or one from a very early run of Doepfer PCBs - but I can not think of Dieter letting a unit go out like that, just not his style. Shorting those pads with a solder bridge would work in a pinch if you haven't any headers laying around to put there. It is easier to solder tack some buss wire on top of those pads than to bridge them with a blob of solder. You don't want to loosen the pads off the board with too much heat.
> 
> -James
> 
> 
> 
> On Jul 24, 2011, at 1:27 PM, E Karel wrote:
> 
> > Thanks, James, that was it!  Even though I've had this A-111 for about 13 years now, and bought it new, the jumper wasn't there.  I added a jumper and now it reads the bus.
> > 
> > I took a look at my two (also 13-year-old) A-140s to see if there was a similar jumper, since those also aren't reading gates from my new A-164-1.  There's a place at the upper-right corner of the circuit board marked INT.GATE and J1, but there are no pins there to hold a jumper on either module.  
> > 
> > Very strangely, though -- strangely because I bought them both new in 1998 -- one of them has a solder blob on the back connecting the two points, and one of them doesn't.  I would think the one with the solder bridge should read the bus, but it doesn't.  It looks slightly blackened/burnt under the solder.
> > 
> > So, given this, any recommendations?  Should I try adding a solder bridge to the one that currently doesn't have one?
> > 
> > Ernst
> > 
> > 
> > 
> > 
> > --- In Doepfer_a100@yahoogroups.com, James Husted <james.husted@> wrote:
> >> 
> > 
> >> Did you get the A-111 new? If it was used, the prior uses may have removed the J1 jumper (upper rich corner of the PCB under the ribbon cable). This jumper has to be there for the A-111 to "see" the CV bus. 
> >> 
> > 
> > 
> > 
> > ------------------------------------
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> 
> 
> 
> [Non-text portions of this message have been removed]
>

Both my A-140 have a true header/jumpers in the upper left corner marked INT.GATE J1. When the jumper is installed the A-140 connects to the bus. If yours does not have the header then a wire soldered across the 2 pads should work. There is not current enough to make a short big enough to blacken the pads - sounds like a bad solder job by someone to me. Looks like you were sold used or store demo units for new, or one from a very early run of Doepfer PCBs - but I can not think of Dieter letting a unit go out like that, just not his style. Shorting those pads with a solder bridge would work in a pinch if you haven't any headers laying around to put there. It is easier to solder tack some buss wire on top of those pads than to bridge them with a blob of solder. You don't want to loosen the pads off the board with too much heat.

-James



On Jul 24, 2011, at 1:27 PM, E Karel wrote:

> Thanks, James, that was it!  Even though I've had this A-111 for about 13 years now, and bought it new, the jumper wasn't there.  I added a jumper and now it reads the bus.
> 
> I took a look at my two (also 13-year-old) A-140s to see if there was a similar jumper, since those also aren't reading gates from my new A-164-1.  There's a place at the upper-right corner of the circuit board marked INT.GATE and J1, but there are no pins there to hold a jumper on either module.  
> 
> Very strangely, though -- strangely because I bought them both new in 1998 -- one of them has a solder blob on the back connecting the two points, and one of them doesn't.  I would think the one with the solder bridge should read the bus, but it doesn't.  It looks slightly blackened/burnt under the solder.
> 
> So, given this, any recommendations?  Should I try adding a solder bridge to the one that currently doesn't have one?
> 
> Ernst
> 
> 
> 
> 
> --- In Doepfer_a100@yahoogroups.com, James Husted <james.husted@...> wrote:
>> 
> 
>> Did you get the A-111 new? If it was used, the prior uses may have removed the J1 jumper (upper rich corner of the PCB under the ribbon cable). This jumper has to be there for the A-111 to "see" the CV bus. 
>> 
> 
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
> 
> 
> 



[Non-text portions of this message have been removed]

> Success!  I solder-tacked a little wire as you said on the unit
> that didn't have the solder blob, and it works!  Thanks again.
>
> No, I don't suspect that the modules left Doepfer in that
> condition -- it might have been something that happened with the
> U.S. distributor at that time, Douglas Wagner of Omaha, Nebraska.
>
> Great, two problems solved.  Now if anyone can help with my other
> query (in another thread), how to modify a 148 S&H to allow it to
> be triggered by the gate output of the 164-1 ....  it is strange
> that these modules aren't compatible.
>
> Thanks again, James!
> Ernst

I'm glad to hear that most of the problems have been solved during the
weekend :-)

The answer concerning the A-164-1 modification can be found in your first
email from Sunday 24th 6:02;

...

> solder a pull down resistor (about 100k) between
> GND and the A-148 input. The resistor can be soldered directly to the
> corresponding terminals of the socket on the bottom side of the A-148 pcb.
> The 100k resistor connects the A-148 input to GND when the button of the
> A-164-1 is not operated. Then the AC coupling capacitor of the A-148 is
> discharged as necessary. I have tried successfully an 100k resistor but
I'm
> sure that any other value in the range 47k ... 220k should do the job.

Best wishes
Dieter Doepfer