Doepfer

Hi All

A quick newbie question, if you don’t mind. I’d be grateful  if someone could post the CV and Gate jumper settings for the A-185-1 Bus module. I acquired one of these modules a little while back but didn’t get around to fitting it. I vaguely remember finding something online regarding how to disable the bus write functionality (which I need to do as I already have the CV and Gate a MIDI interface active on the bus) but I can’t remember if I made the changes :-(

I’ve searched on this forum and in the Doepfer manual but haven’t found this info anywhere.

Check the product webpage?

Sent from my iPhone

> On 29 Oct 2017, at 19:19, del@cix.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> Hi All
> 
> A quick newbie question, if you don’t mind. I’d be grateful if someone could post the CV and Gate jumper settings for the A-185-1 Bus module. I acquired one of these modules a little while back but didn’t get around to fitting it. I vaguely remember finding something online regarding how to disable the bus write functionality (which I need to do as I already have the CV and Gate a MIDI interface active on the bus) but I can’t remember if I made the changes :-(
> 
> I’ve searched on this forum and in the Doepfer manual but haven’t found this info anywhere.
> 
>

From the manual:

6. Appendix

Module A-185 has two internal jumpers on its circuit board, which are factory-set to send external CV and gate signals to the system bus (see fig. 1).

By re-aligning these jumpers, you can convert the A-185 so that it doesn’t take gate and CV signals from the input sockets, but simply ‘reads’ them from the system bus, and sends them out to the front panel CV and gate output sockets. In this “read-only” mode, the input sockets are disconnected from the system bus.

What this means is if the jumpers are engaged (covering both pins) then the signals placed at the INPUT jacks will be sent to both the front panel jacks AND the bus. If they are not engaged, then the front panel input jacks are ignored and the signal that comes out of the output jack comes ONLY from the bus. For example, if you had a A-190 MIDI>CV converter connected to the bus and set with its outputs feeding the bus, the A-185-1 could be used to add two more CV and Gate outs to the A-190. 


I often use the A-185-1 as a buffered y-cord, sending the CV input to two VCOS that are not bus enabled. This only happens with VCOs that cannot be easily modified to use the bus.
-James

James Husted, Designer, Synthwerks LLC • www.synthwerks.com • james@synthwerks.com • info@synthwerks.com

> On Oct 29, 2017, at 12:19 PM, del@cix.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> Hi All
> 
> A quick newbie question, if you don’t mind. I’d be grateful  if someone could post the CV and Gate jumper settings for the A-185-1 Bus module. I acquired one of these modules a little while back but didn’t get around to fitting it. I vaguely remember finding something online regarding how to disable the bus write functionality (which I need to do as I already have the CV and Gate a MIDI interface active on the bus) but I can’t remember if I made the changes :-(
> 
> I’ve searched on this forum and in the Doepfer manual but haven’t found this info anywhere. 
> 
> ------------------------------------
> Posted by: del@cix.co.uk
> ------------------------------------
> 
> 
> ------------------------------------
> 
> Yahoo Groups Links
> 
> 
>

Thanks so much James - very helpful. I’d read that section of the manual but Figure 1 doesn’t actually show the PCB and the jumper positions; it’s a schematic illustrating the routing of the CV and Gate signals to the bus. And since I couldn’t remember whether I’d changed the jumper positions when I first had the module I thought it best to check before inserting it in the A-100 case. As it turns out I had removed them.

I don’t have the module to hand at the moment (on vacation) but I recall that there are three pins for CV and three for Gate (although my ‘little grey cells’ might be letting me down). If I’m right, for future reference, which pins do I need to short to put the module back to factory settings? 

Thanks again for the advice.

I took another look at one of the modules I didn’t have in the case and I may have a more detailed description of what’s going on.

There is a three pin header for each section. They are marked with “(GATE)” and “]”, and “(CV)” and “]”. The side with the word on it is connected to the input jack. The side with the “]” on it is connected to the OP-Amp buffer. The Center pin is connected to the bus on the power header. When the jumper is connected to the side with the word next to it (up for the GATE and to the right for the CV), the Input jack is connected directly to the bus AND through the bus to the buffer circuit and from there to the two OUT jacks on the front panel. 

When the jumper is connected to the “]” side of the header, the INPUT jack is dis-connected and the buffer section only gets it’s input from some other output SENDING device connected to the bus. This is to prevent the accidental connections of two SENDERS on the bus (this should not be done), one already connected there (like an A-190 with the jumper set to SEND to the Bus), and one connected accidentally to the A-185’s input jack. 

The output sections will always output what is on the BUS whether that is coming from the A-185’s INPUT jack (when the header is in the right place - the “word” side) or if something else is SENDING to the bus.

Does that make sense?
-James

> On Oct 29, 2017, at 2:42 PM, del@cix.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> Thanks so much James - very helpful. I’d read that section of the manual but Figure 1 doesn’t actually show the PCB and the jumper positions; it’s a schematic illustrating the routing of the CV and Gate signals to the bus. And since I couldn’t remember whether I’d changed the jumper positions when I first had the module I thought it best to check before inserting it in the A-100 case. As it turns out I had removed them.
> 
> I don’t have the module to hand at the moment (on vacation) but I recall that there are three pins for CV and three for Gate (although my ‘little grey cells’ might be letting me down). If I’m right, for future reference, which pins do I need to short to put the module back to factory settings? 
> 
> Thanks again for the advice.
> 
> ------------------------------------
> Posted by: del@cix.co.uk
> ------------------------------------
> 
> 
> ------------------------------------
> 
> Yahoo Groups Links
> 
> 
>

Jsmes

That’s great. From your description I now see that I should have the jumpers installed differently in order to achieve what I’m after. Most helpful - thank you.