Doepfer

Hi,

If you own an A-127, then you that it can be changed from band pass to 
low pass with internal jumpers.

Now: If you have an A-127 Version 3 (the version is written on the 
pcbs), then it is also possible to get a high pass signal too. You 
simply have to feed pin 14 of IC1 to the center pin of the selection 
jumper; you can pick this signal at the right side of R15, which is the 
resistor direct aside the unused trimmer P8. One cable nothing else!

Btw: the A127 is a hidden gem as it provides in fact three SEM filters!

Florian

How about a switch Dieter

2011/3/27 Florian Anwander <fanwander@mnet-online.de>

>
>
> Hi,
>
> If you own an A-127, then you that it can be changed from band pass to
> low pass with internal jumpers.
>
> Now: If you have an A-127 Version 3 (the version is written on the
> pcbs), then it is also possible to get a high pass signal too. You
> simply have to feed pin 14 of IC1 to the center pin of the selection
> jumper; you can pick this signal at the right side of R15, which is the
> resistor direct aside the unused trimmer P8. One cable nothing else!
>
> Btw: the A127 is a hidden gem as it provides in fact three SEM filters!
>
> Florian
>  
>


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

Hi Ikke

ikke wrote:
> How about a switch Dieter
The problem is, that you would need a real three position rotary switch. 
Which eats space on the frontpanel and is expensive.

But already three jumpers would be great.

Florian

> How about a switch Dieter

No problem. We did this several times but it causes additional charges
because of the required working time and parts.

Best whishes
Dieter Doepfer

Hmmm, I guess you could maybe wire up an A-138-e quad three-way crossfader module to get SEM-style crossfading between filter modes for all three A-127 filters. The fourth crossfader could probably be modified to sum all three filters with a level control (or be left as-is to do a three-way crossfade between the three filters).

This would probably make most sense if you also add separate inputs for the filters.


Ahh, a new project for when I actually have some spare time ;-)

Best,
Denis

On Mar 28, 2011, at 11:02 AM, <yahoo@doepfer.de> <yahoo@doepfer.de> wrote:

> > How about a switch Dieter
> 
> No problem. We did this several times but it causes additional charges
> because of the required working time and parts.
> 
> Best whishes
> Dieter Doepfer
> 
> 



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

Hi Denis

Denis Gökdag schrieb:
> Ahh, a new project for when I actually have some spare time ;-)
I assume it is for you the same as for me: "Ah project number 1347 for 
when I actually have some spare time ;-)"

Florian

Cool, thanks for the tip. It already was one of my favorite filter modules.
I made an expansion module for the low-pass/bandpass modification
info here : 
http://patchpierre.blogspot.com/search/label/A-127

I guess i have to expand my expansion module now...

btw... feel free to check out the rest of my blog too ;-)
Find it at http://patchpierre.blogspot.com

Greetings,
            Pierre / NetPierre / PatchPierre



--- In Doepfer_a100@yahoogroups.com, Florian Anwander <fanwander@...> wrote:

>
> Hi,
> 
> If you own an A-127, then you that it can be changed from band pass to 
> low pass with internal jumpers.
> 
> Now: If you have an A-127 Version 3 (the version is written on the 
> pcbs), then it is also possible to get a high pass signal too. You 
> simply have to feed pin 14 of IC1 to the center pin of the selection 
> jumper; you can pick this signal at the right side of R15, which is the 
> resistor direct aside the unused trimmer P8. One cable nothing else!
> 
> Btw: the A127 is a hidden gem as it provides in fact three SEM filters!
> 
> Florian
>