[GreenKeys] Dovetron MPC 1000R hum

[Jeff G]

If it happens to be a 3.5mm headphone jack somewhere in the mix, make sure
its plugged in all the way too. I -believe- the Dovetron may have a
isolated interface, but I forget.

Jeff kc3gjx

On Sun, Dec 3, 2023 at 8:02 PM Harold Hallikainen via GreenKeys <
greenkeys at mailman.qth.net> wrote:

>
>
> On Sun, December 3, 2023 3:59 pm, Cecil Lale via GreenKeys wrote:
> > I have a dovetron MPC 1000R with 60hz hum on the Afsk output. I changed
> > all the diodes and filter caps in the power supply. The hum is still
> > there. Any ideas? I did not change the 2 15volt regulators.thanksCecil
> > KF6ZOK
>
>
> I wonder if it's a ground loop issue. If you disconnect the audio output
> from any other equipment, and then connect some headphones to the audio
> output, do you still get hum?
>
> Harold
> https://w6iwi.org
>
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