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Middle Earth Model Railway
6th October 2008 Monday, 2:10pm

Last Updated 29/7/08
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Electrical Systems
Power Supply | Power Distribution | Controller Circuit Diagram | Points Control | Accessories | The Future...
The following is a circuit diagram of the railway's hand-held controllers. All the parts should be available via either RS Components or Maplin.

| Component |
Description |
RS Cat. No. |
Maplin Cat. No. |
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| R1-R3 |
10kW resistor |
131-839 |
M10K |
| VR1 |
10kW linear potentiometer |
855-462 |
JM85G |
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| D1 |
LED (Red) - any size |
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| D2 |
1N4148 diode |
271-606 |
QL80B |
| D3-D7 |
1N4002 diode |
261-154 |
QL74R |
| D8 |
LED (Green) - any size |
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| C1 |
10mF / 25V capacitor |
267-5139 |
AT02C |
| TR1 |
BC337 transistor |
131-1430 |
QB68Y |
| TR2 |
MJE3055 transistor |
313-6916 |
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| CB1 |
1 amp circuit breaker |
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| S1 |
Switch (DPDT) - ON-OFF-ON |
330-991 (toggle) |
FH05F |
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Heatsink (for TR2) |
234-2328 |
KU50E |
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NOTE: a heatsink must be connected to TR2 to prevent it overheating.
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