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This circuit is a system that automatically enables the judgment and the gradual departure of a locomotive, for electric trains circuits.
Power is supplied with an alternating voltage of 16 V.
The consumption is approximately 30 mA.

A final check the implementation of components and welds.
Install a small THEY between the two rails, where the engine should start slow, considering that the time of the stop is about 5 seconds.
Delete all previous wiring between the power supply and track.
Connect the two son of the ILS on the circuit in points marked "A-B".
Connect power supply rails on the track, points scored with + and -.
Attach a small magnet under the locomotive, making sure it touches well ILS in order to cause the contact.
Connect the output of 16 V secondary power transformer circuit for points scored =
Place the locomotive just after the ILS, and start with food, moving forward. If she goes in the wrong direction, reverse the son + and -.
One full turn of the circuit so that it passes on the ILS, and begins to gradually slow down for about 5 seconds, until the engine stops.
After the dwell time, which is adjustable by the adjustable resistance RA from 10 seconds to 1 minute, the engine restarts.
The circuit only works in one direction.
By reversing the direction of travel, the system does not fire

1 - 1 -circuit imprimé
2- 1- radiateur de Iriac
3- 1-vis3x10mm
4- 1- écrou 3mm
5- 1- rondelle 3mm.
6- 1-relais 12 V2RT
7- 1 - support de circuit imprimé 8pts
8- 1- support de circuit imprimé 14pts
9- 1 - circuit intégré NE 555 
10- 1- circuit intégré CD 4001 
11- 1-circuit intégré BC 547 T1 
12- 1- transistor BD 601 = TIP 31 T2 
13- 1-diode zener BZX85C12V DZ
14- 8- diodes IN4007 D1 à D4-D6 à D9
15- 1-diode 1N4148 D5
16- 1-résistances ajustables 1 M RA 
17- 1-résistance 100R (marron-noir-marron) R4 
18- 1- résistance 4.7K (jaune-violet-rouge) R6 
19- 1- résistance 10K (marron-noir-orange) R3 
20- 1-résistance 330K (orange-orange-jaune) R5 
21- 2- résistances 270R (rouge-violet-marron) R1-R2
22- 2- condensateurs 0.1MF = 100NF C3-C4
23- 1-cond chim.10 MF/25V/RAD C2
24- 1-cond chim.47MF/25V/RAD C5
25- 3- cond chim 220MF/25V/RAD C1-C6-C7
26- 1-soudure
27- 1- fil

When points A and B are fleetingly in contact with the ILS, the C5 capacitor discharges, and the timer circuitry comprises ie 555 starts, and gradually activates the multivibrator using the doors of 4001. This system changes the polarization the amplifier transistors T1 and T2, until blockage. The voltage on the rails becomes zero, through the relay contacts, and the locomotive stops.
The C5 capacitor charges, and after the time delay set by the adjustable resistance RA, the flop gradually releases the transistors T1 and T2. Relay picks, and the voltage across the rails increases. The engine starts.
The continuing internal power supply from the transformer secondary circuit, is rectified by the diode bridge D1 to D4 and stabilized at 12 V by zener diode DZ. The filtering is performed by the capacitor CI.

The installation requires attention.
The components are welded closest du circuit, the screen printed side.
Start with the diodes D1 to D9 and the zener diode DZ, the voltage of 12 V is marked in light on it, respecting the position of their ring.
Solder resistors and non-polarized capacitors.
Weld the chemical capacitors, following the polarity indicated on their Box- The shortest leg tells you -.
Weld the adjustable resistor and IC substrates.
Solder the transistor T1 by properly orienting the flat.
The transistor T2 is welded vertically. Its orientation is indicated by the part
black on the diagram, which indicates its metal face. Then screw the radiator metal side.
Weld the relay. 1! may not be in only one direction.
Insert the integrated circuit s on their support, - by directing them properly.
They are marked with a notch or a point to the left, on top of its box.

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