Synth-DIY Yahoo! Groups Archives

Thread

A-110 sometimes transposed a 5th interval on power up

2013-11-30 by blair_cowan@mac.com

Hi, I have two A-110 VCO's mounted in separate mini cases, and with their CV input fed from an A-182 switched multiple. generally I have them tuned to unison, but 1 octave apart. The 'tune' knob is set to 5 in each case.

Every once in a while when I switch them on, one of them has an offset of a 5th interval against the other, and I have to retune it using the P6 Offset pot. Note that the 'tune' dial is showing the same value as before 5th note offset developed.

This has happened to both of my A-110 VCOs at different times. They were purchased from separate suppliers several months apart, so I do not believe they were from the same batch.

At the moment this is just a nuisance, however if it continued I would start to worry that other faults are going to develop. Has anyone else experienced this 'phantom' 5th offset, and if so, what did they do about it?

Hoping you can help,

Thanks, Blair

Glasgow, Scotland.

Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-11-30 by James Husted

Do you have any modules in that case that may be sending signals on the internal CV bus? An A-190 for instance? Of course that should effect both VCOs unless one has the jumper set to look at the CV bus, and the other one doesn't.

-James

On Nov 30, 2013, at 9:47 AM, blair_cowan@mac.com wrote:

Hi, I have two A-110 VCO's mounted in separate mini cases, and with their CV input fed from an A-182 switched multiple. generally I have them tuned to unison, but 1 octave apart. The 'tune' knob is set to 5 in each case.

Every once in a while when I switch them on, one of them has an offset of a 5th interval against the other, and I have to retune it using the P6 Offset pot. Note that the 'tune' dial is showing the same value as before 5th note offset developed.

This has happened to both of my A-110 VCOs at different times. They were purchased from separate suppliers several months apart, so I do not believe they were from the same batch.

At the moment this is just a nuisance, however if it continued I would start to worry that other faults are going to develop. Has anyone else experienced this 'phantom' 5th offset, and if so, what did they do about it?

Hoping you can help,

Thanks, Blair

Glasgow, Scotland.

RE: Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-12-01 by blair_cowan@mac.com

Hi, also on same buss of one of the A-110's is a doepfer dual vca, a makenoise modemix, and a doepfer voltage controlled LFO.

In the other case I have an A-108 filter, an intellijel ufold, and my other A-110. Could any of these devices be sending a stray control voltage via the buss?

Thanks,

Blair

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

-James

Show quoted textHide quoted text

On Nov 30, 2013, at 9:47 AM, blair_cowan@... wrote:

Hi, I have two A-110 VCO's mounted in separate mini cases, and with their CV input fed from an A-182 switched multiple. generally I have them tuned to unison, but 1 octave apart. The 'tune' knob is set to 5 in each case.

Every once in a while when I switch them on, one of them has an offset of a 5th interval against the other, and I have to retune it using the P6 Offset pot. Note that the 'tune' dial is showing the same value as before 5th note offset developed.

This has happened to both of my A-110 VCOs at different times. They were purchased from separate suppliers several months apart, so I do not believe they were from the same batch.

At the moment this is just a nuisance, however if it continued I would start to worry that other faults are going to develop. Has anyone else experienced this 'phantom' 5th offset, and if so, what did they do about it?

Hoping you can help,

Thanks, Blair

Glasgow, Scotland.

RE: Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-12-01 by blair_cowan@mac.com

James,

what jumper are you referring to on the A-110? I have the user manual and also the service manual extract, available from the link on the Doepfer A-110 product web page. I cannot see a reference to a jumper. I will certainly investigate it once I find it!

Thanks,

Blair

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

-James

Show quoted textHide quoted text

On Nov 30, 2013, at 9:47 AM, blair_cowan@... wrote:

Hi, I have two A-110 VCO's mounted in separate mini cases, and with their CV input fed from an A-182 switched multiple. generally I have them tuned to unison, but 1 octave apart. The 'tune' knob is set to 5 in each case.

Every once in a while when I switch them on, one of them has an offset of a 5th interval against the other, and I have to retune it using the P6 Offset pot. Note that the 'tune' dial is showing the same value as before 5th note offset developed.

This has happened to both of my A-110 VCOs at different times. They were purchased from separate suppliers several months apart, so I do not believe they were from the same batch.

At the moment this is just a nuisance, however if it continued I would start to worry that other faults are going to develop. Has anyone else experienced this 'phantom' 5th offset, and if so, what did they do about it?

Hoping you can help,

Thanks, Blair

Glasgow, Scotland.

RE: RE: Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-12-01 by pierre@netpierre.nl

There's no jumper on the A-110 board, but you might want to check out my post at http://patchpierre.blogspot.nl/2010/11/busboard-access.html that is related to that idea.

Good luck

Pierre Serné / PatchPierre / NetPierre

---In Doepfer_a100@yahoogroups.com, <blair_cowan@...> wrote:

James,

Thanks,

Blair

Show quoted textHide quoted text

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

Do you have any modules in that case that may be sending signals on the internal CV bus? An A-190 for instance? Of course that should effect both VCOs unless one has the jumper set to look at the CV bus, and the other one doesn't.
-James

On Nov 30, 2013, at 9:47 AM, blair_cowan@... wrote:

Hi, I have two A-110 VCO's mounted in separate mini cases, and with their CV input fed from an A-182 switched multiple. generally I have them tuned to unison, but 1 octave apart. The 'tune' knob is set to 5 in each case.

Every once in a while when I switch them on, one of them has an offset of a 5th interval against the other, and I have to retune it using the P6 Offset pot. Note that the 'tune' dial is showing the same value as before 5th note offset developed.

This has happened to both of my A-110 VCOs at different times. They were purchased from separate suppliers several months apart, so I do not believe they were from the same batch.

At the moment this is just a nuisance, however if it continued I would start to worry that other faults are going to develop. Has anyone else experienced this 'phantom' 5th offset, and if so, what did they do about it?

Hoping you can help,

Thanks, Blair

Glasgow, Scotland.

RE: RE: Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-12-01 by pierre@netpierre.nl

oops... the A-110 doés have a jumper, but you got the idea...

Pierre

---In Doepfer_a100@yahoogroups.com, <blair_cowan@...> wrote:

James,

Thanks,

Blair

Show quoted textHide quoted text

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

Do you have any modules in that case that may be sending signals on the internal CV bus? An A-190 for instance? Of course that should effect both VCOs unless one has the jumper set to look at the CV bus, and the other one doesn't.
-James

On Nov 30, 2013, at 9:47 AM, blair_cowan@... wrote:

Hi, I have two A-110 VCO's mounted in separate mini cases, and with their CV input fed from an A-182 switched multiple. generally I have them tuned to unison, but 1 octave apart. The 'tune' knob is set to 5 in each case.

Every once in a while when I switch them on, one of them has an offset of a 5th interval against the other, and I have to retune it using the P6 Offset pot. Note that the 'tune' dial is showing the same value as before 5th note offset developed.

This has happened to both of my A-110 VCOs at different times. They were purchased from separate suppliers several months apart, so I do not believe they were from the same batch.

At the moment this is just a nuisance, however if it continued I would start to worry that other faults are going to develop. Has anyone else experienced this 'phantom' 5th offset, and if so, what did they do about it?

Hoping you can help,

Thanks, Blair

Glasgow, Scotland.

RE: RE: RE: Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-12-02 by blair_cowan@mac.com

Guys, can you tell me where the jumper is on the A-110 circuit board which enables or disables access to the CV signal of the Buss please? I am not sure that this is what is causing my occasional 'transpositions', but it is the closest thing I have to a clue as to how to resolve my issue.

Thanks,

Blair

---In Doepfer_a100@yahoogroups.com, <pierre@...> wrote:

oops... the A-110 doés have a jumper, but you got the idea...

Pierre

Show quoted textHide quoted text

---In Doepfer_a100@yahoogroups.com, <blair_cowan@...> wrote:

James,

what jumper are you referring to on the A-110? I have the user manual and also the service manual extract, available from the link on the Doepfer A-110 product web page. I cannot see a reference to a jumper. I will certainly investigate it once I find it!

Thanks,

Blair

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

Do you have any modules in that case that may be sending signals on the internal CV bus? An A-190 for instance? Of course that should effect both VCOs unless one has the jumper set to look at the CV bus, and the other one doesn't.
-James

On Nov 30, 2013, at 9:47 AM, blair_cowan@... wrote:

Hi, I have two A-110 VCO's mounted in separate mini cases, and with their CV input fed from an A-182 switched multiple. generally I have them tuned to unison, but 1 octave apart. The 'tune' knob is set to 5 in each case.

Every once in a while when I switch them on, one of them has an offset of a 5th interval against the other, and I have to retune it using the P6 Offset pot. Note that the 'tune' dial is showing the same value as before 5th note offset developed.

This has happened to both of my A-110 VCOs at different times. They were purchased from separate suppliers several months apart, so I do not believe they were from the same batch.

At the moment this is just a nuisance, however if it continued I would start to worry that other faults are going to develop. Has anyone else experienced this 'phantom' 5th offset, and if so, what did they do about it?

Hoping you can help,

Thanks, Blair

Glasgow, Scotland.

Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-12-02 by Zoë Blade

> Guys, can you tell me where the jumper is on the A-110 circuit board which enables or disables access to the CV signal of the Buss please?  I am not sure that this is what is causing my occasional 'transpositions', but it is the closest thing I have to a clue as to how to resolve my issue.

Is it the "Int. CV" jumper directly above where the buss pins are?  I'm just going by what's shown on http://www.doepfer.de/a110_tec.htm and http://www.doepfer.de/A100_pictures/doepfer_a110.jpg ...

Good luck!
Zoë.

Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-12-02 by Nicholas Keller

Yeah that's it.  You can see at BU2 that Int. CV is normalized to CV1 Input. 

Nick

Show quoted textHide quoted text

> On Dec 2, 2013, at 7:34 AM, Zoë Blade <zoe@bytenoise.co.uk> wrote:
> 
> > Guys, can you tell me where the jumper is on the A-110 circuit board which enables or disables access to the CV signal of the Buss please? I am not sure that this is what is causing my occasional 'transpositions', but it is the closest thing I have to a clue as to how to resolve my issue.
> 
> Is it the "Int. CV" jumper directly above where the buss pins are? I'm just going by what's shown on http://www.doepfer.de/a110_tec.htm and http://www.doepfer.de/A100_pictures/doepfer_a110.jpg ...
> 
> Good luck!
> Zoë.
> 
>

RE: Re: [Doepfer_a100] A-110 sometimes transposed a 5th interval on power up

2013-12-03 by blair_cowan@mac.com

Zoë, Nick,

thanks for your help. I gave found the jumper now. It seems to have been fitted correctly, however I have removed and then reset it, just in case. I am still baffled as to how my A-110's can develop a 5th note offset completely on their own. Maybe this is a case of the "ghost in the machine"?

Who knows. They sound good though, when they are not misbehaving!

Blair

---In Doepfer_a100@yahoogroups.com, <maq163x2@...> wrote:

Yeah that's it. You can see at BU2 that Int. CV is normalized to CV1 Input.

Nick

On Dec 2, 2013, at 7:34 AM, Zoë Blade <zoe@...> wrote:

> Guys, can you tell me where the jumper is on the A-110 circuit board which enables or disables access to the CV signal of the Buss please? I am not sure that this is what is causing my occasional 'transpositions', but it is the closest thing I have to a clue as to how to resolve my issue.

Is it the "Int. CV" jumper directly above where the buss pins are? I'm just going by what's shown on http://www.doepfer.de/a110_tec.htm and http://www.doepfer.de/A100_pictures/doepfer_a110.jpg ...

Good luck!
Zoë.