It could be the filtering in the PS (both) or the unit.

What are the specs on the OEM PS and the one you tried?

Joe M.

On 5/13/2018 4:32 PM, Art wrote:
> Hi All,
>
> I have a stubborn problem with a FisherPrice baby monitor. It's an older
> 49 MHz wireless unit.
>
> The receiver has constant hum whenever it is run with a wall wart. On
> batteries, it sounds as quiet as a church mouse.
>
> I've tried plugging it into different outlets, I've swapped wall warts
> with one from my junk box. I've tried wrapping it in aluminum foil (for
> shielding), no difference. If I listen to the signal in my scanner, it
> sounds like a million bucks.
>
> I'd really like to use this thing for home security as the thing can
> hear a mouse fart at 100 yards, just the thing to put in my garage.
>
> Any ideas?
>
> TY, Art
>
>
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