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Index 91

Automatic Reversing Circuit Schematic - DC Output

Published:2013/6/21 3:04:00 Author:muriel | Keyword: Automatic Reversing Circuit, DC Output

Automatic Reversing Circuit Schematic - DC Output
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phototransistor sensors

Published:2013/6/21 3:04:00 Author:muriel | Keyword: phototransistor sensors

phototransistor sensors
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Flip-Flop circuit

Published:2013/6/21 3:02:00 Author:muriel | Keyword: Flip-Flop circuit

Flip-Flop circuit
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'Y' TRACK SWITCH MACHINE CONTROL

Published:2013/6/21 3:02:00 Author:muriel | Keyword: 'Y' TRACK SWITCH, MACHINE CONTROL

'Y' TRACK SWITCH MACHINE CONTROL
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OUT-AND-RETURN OPERATION

Published:2013/6/21 3:01:00 Author:muriel | Keyword: OUT-AND-RETURN OPERATION

OUT-AND-RETURN OPERATION
In this circuit the train only moves when S1 is pushed. After a set waiting time the train returns to its start position and then waits. The 555 timer in this circuit is configured as a monostable oscillator. The SPDT switch allows the circuit to be changed from normal operation to out-and-back operation. Two 555 timers are indicated but a 556 timer can also be used. (View)

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STATION STOP

Published:2013/6/21 3:01:00 Author:muriel | Keyword: STATION STOP

STATION STOP
This circuit will stop and start the train at a station located on the reversing track. This circuit is as simple as possible, using the bottom section of a 556 timer as a photodetector and the top section as the delay timer. The timing circuit takes its control and track power from the power supply circuit on this page. NOTE: When using this circuit, there are other things to consider, such as; train length and whether the locomotive has all wheel pickup. These can affect the placement of the gaps and phototransistors. (View)

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PSEUDO SPEED CONTROL

Published:2013/6/21 3:00:00 Author:muriel | Keyword: PSEUDO SPEED CONTROL

PSEUDO SPEED CONTROL
This track circuit uses diodes and gaps to provide a crude form of speed control. (View)

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longer stopping sections

Published:2013/6/21 2:59:00 Author:muriel | Keyword: longer stopping sections

The next diagram shows how to provide increased stopping distances for trains with head-end power. The longer stopping sections can be switched if the train is reversed. (View)

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BASIC TRACK CIRCUIT

Published:2013/6/21 2:59:00 Author:muriel | Keyword: BASIC TRACK CIRCUIT

The basic track circuit provides continuous back and forth operation of the train with diodes and gaps to stop the train at each end of the track.Also shown is an optional LED that will show when the train has been trapped at the end of the track. (View)

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POWER SUPPLY and TIMER

Published:2013/6/21 2:58:00 Author:muriel | Keyword: POWER SUPPLY and TIMER

POWER SUPPLY and TIMER
The power supply circuit provides power to the track and has a 12 volt power source for the 555 timer IC that controls the waiting time at each end of the track. NOTE: The circuit does not know when or how fast the train is moving, therefore the timer's cycle times must also include the time for the train to travel along the track in either direction. For example it the train is to wait for 30 seconds at the end of the track, the timer will be set for: The time to travel to the end of the track + 30 seconds.The reversing switch on the power pack itself is only used to set the initial travel direction of the system or to 'switch ends' if the waiting times are not equal. The calculator at the following link can be used to determine values for resistors R1 and R2 and capacitor C1. (LM555 - Astable Oscillator Calculator) (View)

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Alternate Location Control

Published:2013/6/21 2:53:00 Author:muriel | Keyword: Alternate Location Control

Alternate Location Control
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CURRENT LIMITING RESISTOR CALCULATOR FOR LIGHT EMITTING DIODES

Published:2013/6/21 2:52:00 Author:muriel | Keyword: CURRENT LIMITING RESISTOR CALCULATOR , LIGHT EMITTING DIODES

CURRENT LIMITING RESISTOR CALCULATOR FOR LIGHT EMITTING DIODES
The calculators on this page can be used to find current limiting resistors and currents for Light Emitting Diodes. The first calculator determines the resistance for a desired LED current while the second calculates the current for a given resistance. (View)

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Block Occupancy Detector Helper Circuit

Published:2013/6/21 2:52:00 Author:muriel | Keyword: Block Occupancy Detector, Helper Circuit

Block Occupancy Detector Helper Circuit
This circuit would be used to hold a BLOCK OCCUPIED condition as a train passes out of the block even if the normal detector is not sensing a train. The Helper circuit uses phototransistor type light activated detectors to sense that a train is still in the block, even though the engine has left that block. The only reason to use this circuit is if there are no conducting wheel sets at the tail end of the train that would keep the normal occupancy detector activated until the train has completely exited from the block. Simply stated the Helper circuit's output is in parallel with that of the normal detector. When the Helper circuit is activated by a train covering one of the phototransistors at either end of the block, the Helper's output holds the block as occupied even though there is no current flowing through the sensing circuit of the normal detector and has therefore turned OFF. (View)