Customize your Revenge From Mars pinball machine

As all RFM owners know there is a flash dome above the scoop to the rear of the playfield.
Just the right place to mount a 3rd saucer. A 3rd saucer should also have leds as well. It only needs 5 leds as you cannot see the rear.

Parts used:

• five 3mm red leds Vf = 2.5V (forward voltage) If = 25mA (forward current) Vr = 5V (reverse voltage )
• 60 cm single core 1mm wire
• 25 cm heat shrink tubing
• 1 saucer and green flash dome (RFM)
• 1 22 ohm resistor

I worked on the principle that the voltage from the connector was 13 volts - Use this website for your own peace of mind : http://led.linear1.org/led.wiz

Attach five 3mm leds in the saucer holes with the anodes and cathodes next to each other so they run in series.
Fix with super glue.
Bend the legs forward, to form a 'V' shape. This aids soldering

Solder the legs and insulate with electrical tape.

Cover the wire with heat shrink tubing and run the wires down through the playfield and re attach the plastic and the saucer

Find the connector for the flash dome and use a resistor (connected to the cathode) to limit the voltage. Test with crocodile clips to make sure it works.
If it does solder the resistor to the wire.

As I used single strand wire I was able to connect the wire to the connector block WITHOUT soldering. It all just pushed together in the connector.

This modification is developed by Stan Simpson.