by CLIVE JONES
Here's a little 'enhauntsment' for your Gottlieb...
I was working away on my Haunted House and thought 'wouldn't it be nice
there was an eerie green glow rising up from the trap door when it opens'
ala HALLOWEEN, so I built a little circuit to do it.
It's *very* simple, it involves adding a Williams rollover microswitch
a 555 bulb holder wired across the G.I.
The source for the GI power is tapped off the GI lamp beneath the devils
plastic next too the extra ball kicker, and returned to the same point
Quite simply, the weight of the door trips the microswitch - you'll
need to bend
the wire form to shape and make sure that the door falls the full distance
before triggering the switch. I didn't need to add any additional weight
The bulb must be positioned carefully as not to foul either the trap
door or the
ball falling through it. I used a 555 bulb holder from a parted out
Bally pin but
any bulb holder will do.
You'll need a bradle of similar hole making tool to get the peen holes
the assy's in position and mark with a pencil.
Be carefull not to foul the trap door blade switch with the bulb holder
all connections / adjustments with the power off.
To test - just pull the wire form down during attract and the lamp should
with the GI relay.
The 555 adds more than enough light to give the effect - I was more
pleased with the results. I used a green green silicon bulb cap to tint
Here the usual ASCII drawing...
Trap Door Assembly from the underside of the playfield
|WMS rollover microswitch-> |__o__o__| |
| n/c+ + +
-> | | |_____________|
'---------. | |
| (+) (+) | <-- Trap Door
| | Bracket Assy
door | | (+)(+) |
_----____ \ \____|
| 555 (&) |
| bulb ->
|_| | ()
\ Trap Door
[_]-. | O
| <--- actuator arm
| | | | |_______/
| |][||__| |___|
| | | |_____|
| | | |
| | |
trap | | |
door | | --==-----==--
switch --> | | | |
| | | |
| |||| | |
| O|||| |
| |||| |
| | ==============
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Pinball News 2002