[sdiy] Ground = -15V ????

[Seb Francis]

Could it be that you are connecting the 15V in the power supply of your 
new synth to mains earth?

Seb


Rutger Vlek wrote:

> Hello everyone,
>
> I'm having a strange problem with a synth i'm building. It's just 
> finished and works fine, but I found out that there's a voltage 
> difference between the synths ground and the ground of my mixer. The 
> difference is 15V!! That's exactly the voltage the powersupply of the 
> synth is generating. Compared with the ground of other synths or the 
> wall outlet ground the difference is also 15V! This means that 
> connecting a synth to the external input i made on my synth makes that 
> current is flowing between them. I don't like that... and I get lots 
> of weird behavior when i make the connection.
>
> I have a symetrical power supply in the synth that gives +15V and 
> -15V. I'm using a power distribution board identical to the Oakley 
> Sound Dizzy board. All panel grounds, board grounds and digital 
> grounds come together on the distribution board and are connected to 
> the power supply's 0V.
>
> I am using a 3-pin mains power connector connected to a grounded wall 
> outlet, but internally i'm not using this third pin. Should I?
>
> Greetings,
>
> Rutger
>
>
>
>