> I noticed yesterday that when the my Velleman oscilloscope is on,
> it adds a high-pictched frequency to the audio signal. Is there a
> way to wire an off switch to this unit
>
> Bryan

I never noticed such a signal in our system. It might have two reasons:

- The A-100 power supply is not sufficient (the Velleman takes 300mA)
- the microcontroller in the Velleman interferes with the A-100 modules

A separate power supply for the Velleman may solve the problem. A simple
non-stabilized 9...12V power supply is sufficient.

Best wishes
Dieter Doepfer