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Do you have a train power pack? If so, there are usually a set of contacts for accessories. Get some grain of wheat or grain of rice bulbs rated for at least 12 volts and attach them to wires and attach the wires to the power pack accessories terminal. Motors - they should be rated at 12V too.
You could always use a 9 volt battery for short term demonstration too.
You can also use a dollhouse wiring kit. The kit comes with a transformer and wiring tape which works well. Its a copper stripped tape that adheres to wood ect. and is very thin...then by simply drilling onto it and placing the wire, your hooked up (90% turns and "T's" are made by over lapping tape and using thumb tacks/brads to make the connections).receptacles even are added by placing small pop rivet like plugs into the tape, and small plugs (on wires)fit into these( all comes in the kit )... It will run small motors too...Depending on what you are planning....I'd think about separating the motors from the lights...Lighting can be by the kit or one small transformer, and motors by another transformer( so lights don't flicker with interference)....just a couple buildings can be lighted by a small string of X-mas lights too.
a dollhouse wire kit can be seen here: http://store.dollhousecollectables.com/wire.html
Do you have a train power pack? If so, there are usually a set of contacts for accessories. Get some grain of wheat or grain of rice bulbs rated for at least 12 volts and attach them to wires and attach the wires to the power pack accessories terminal. Motors - they should be rated at 12V too.
You could always use a 9 volt battery for short term demonstration too.
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