PLAN B analog blog

i purchased a model 15 used recently.

i am experiencing what sounds like a ground hum.

any suggestions would be much appreciated.

i am using the doepfer d.i.y power supply #1 i believe, its the one
with 2 busboards.

 the case is made of wood w/ metal rails.

i have unhooked all other modules and tried powering the module as far
away from the power supply as possible w/ no luck.

unfortanettly this is the only analog osc i have so i cant tell if its
an issue w/ the power or the module itself.

i know its not the electrical in my room as i have brought the system
to other places and received the same results.

any suggestions will be greatly appreciated.

thanks, tony

Tony - the faceplate of the Model 15 has to be grounded.  Ground the
rails, this will ground the faceplates moutned to it.

- P


--- In PLAN_B_analog_blog@yahoogroups.com, "dematteoanthony"
<dongchi1@...> wrote:

>
> i purchased a model 15 used recently.
> 
> i am experiencing what sounds like a ground hum.
> 
> any suggestions would be much appreciated.
> 
> i am using the doepfer d.i.y power supply #1 i believe, its the one
> with 2 busboards.
> 
>  the case is made of wood w/ metal rails.
> 
> i have unhooked all other modules and tried powering the module as far
> away from the power supply as possible w/ no luck.
> 
> unfortanettly this is the only analog osc i have so i cant tell if its
> an issue w/ the power or the module itself.
> 
> i know its not the electrical in my room as i have brought the system
> to other places and received the same results.
> 
> any suggestions will be greatly appreciated.
> 
> thanks, tony
>

is your PSU grounded to the mounting rails in your case?


--- On Thu, 7/17/08, dematteoanthony <dongchi1@hotmail.com> wrote:

> From: dematteoanthony <dongchi1@hotmail.com>
> Subject: [PLAN_B_analog_blog] model 15 hum
> To: PLAN_B_analog_blog@yahoogroups.com
> Date: Thursday, July 17, 2008, 4:32 PM
> i purchased a model 15 used recently.
> 
> i am experiencing what sounds like a ground hum.
> 
> any suggestions would be much appreciated.
> 
> i am using the doepfer d.i.y power supply #1 i believe, its
> the one
> with 2 busboards.
> 
>  the case is made of wood w/ metal rails.
> 
> i have unhooked all other modules and tried powering the
> module as far
> away from the power supply as possible w/ no luck.
> 
> unfortanettly this is the only analog osc i have so i cant
> tell if its
> an issue w/ the power or the module itself.
> 
> i know its not the electrical in my room as i have brought
> the system
> to other places and received the same results.
> 
> any suggestions will be greatly appreciated.
> 
> thanks, tony
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
> 
> 
>

Hi, 
I had this problem (hum coming from audio out of my M15) after adding 
a certain module to my rack from another manufacturer. I removed the 
module from the power bus and the problem disappeared. I have since 
placed the module that was causing the problem in another rack with a 
separate power supply. Everything is fine. If you have other modules 
on your power bus. I would recommend disconnecting each module 1 by 
1, (ie: power rack down, remove a module, power rack up, listen to 
M15 and so on...) to determine whether there is something on the bus 
that may be inducing the hum. 

Regards, 
Adam 

--- In PLAN_B_analog_blog@yahoogroups.com, "dematteoanthony" 
<dongchi1@...> wrote:
>
> i purchased a model 15 used recently.
> 
> i am experiencing what sounds like a ground hum.
> 
> any suggestions would be much appreciated.
> 
> i am using the doepfer d.i.y power supply #1 i believe, its the one
> with 2 busboards.
> 
>  the case is made of wood w/ metal rails.
> 
> i have unhooked all other modules and tried powering the module as 
far
> away from the power supply as possible w/ no luck.
> 
> unfortanettly this is the only analog osc i have so i cant tell if 
its
> an issue w/ the power or the module itself.
> 
> i know its not the electrical in my room as i have brought the 
system

> to other places and received the same results.
> 
> any suggestions will be greatly appreciated.
> 
> thanks, tony
>