A magnet under the train operates reed switches positioned on the track. The first reed switch changes the signal to red as the train passes, then further along the track a second reed switch changes the signal back to green ready for the next train. The isolated section of track just in front of the signal is switched off by the relay when the signal is red so a train will stop automatically at the red signal.
Parts Required
resistors: 1k ×2, 33k ×2
capacitors: 220µF
1N4001 diode
1N4148 diode
red LED (3mm best)
green LED (3mm best)
555 timer IC
8-pin DIL socket for IC
push-switch ×2
reed switch ×2
relay SPCO 12V coil
miniature magnet - each locomotive needs one
stripboard 11 rows × 24 holes
Parts Required
resistors: 1k ×2, 33k ×2
capacitors: 220µF
1N4001 diode
1N4148 diode
red LED (3mm best)
green LED (3mm best)
555 timer IC
8-pin DIL socket for IC
push-switch ×2
reed switch ×2
relay SPCO 12V coil
miniature magnet - each locomotive needs one
stripboard 11 rows × 24 holes
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