Hi All, here is a simple circuit with just 2 components which switches
the light off when the drum rotates. See it here:

http://tech.ph.groups.yahoo.com/group/MF3D-group/photos/browse/7410?c=

This is for viewers with LED lighting panel only. The transistor, a
darlington pair TIP127, made for switching applications is easily
obtained, and the resistor is 470 ohms 1/4 watt. The TIP127 is simply
put in the positive line going to the LED panel, and the resistor hooks
onto the positive wire going to the motor. Works GREAT !

If anyone is interested, I can give a more detailed How-to. This mod
can be done on the circuit board or in the space behind the LED Panel.
Requires Viewer disassembly (easy).

Happy 3D-ing, Peter

Peter Thomson wrote:

> Hi All, here is a simple circuit with just 2 components which switches
> the light off when the drum rotates. See it here:

Peter, thank you!
I've been meaning to buy a viewer and figure out how to do this but
you've saved me the trouble.

John Thurston
Juneau, Alaska

> Peter, thank you!
> I've been meaning to buy a viewer and figure out how to do this but
> you've saved me the trouble.
>
> John Thurston
> Juneau, Alaska
>

Hi John, you're welcome. Make sure you get the LED lighting model,
their best and recommended. It really is the best with instant
lighting, low power, can even run off a 12 volt battery, and with even
illumination. I highly recommend it. Cheers, Peter