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Make one. Simple.
I imagine that the ball contacting the wires of the ramp completes a circuit to switch on the magnet for a very short period of time, so accelerating the ball on the downward slope, but switching off before it reaches the bottom. The extra imparted energy is enough for it to then make the jump back to the tray.
The timer is really the only complicated bit.
RagnarHairybreeks
Backstop
I suppose there is some trial and error of placement, and getting the ramp curves right.
Where can I buy an electromagnet from?