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Longer running out for DC-locos
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Saved on April 4, 1999.
Not every locos have sufficient rolling out distance. Even some locos with flywheel roll out only few centimeters. The reason for this can be the mechanical or the electric resistance, because the DC-motor operates inversely as a generator. When the loco enters a voltageless section the motor supplies every electric consumers. These brake the generator (motor). For this problem is the represented circuit a real simple solution.

The both Transistors (type: BD 675) work as diodes controlled by voltage. The resistance R influences, from how large voltage gets power through the diodes to the motor (M). When the power supply is interrupted the transistors lock and the motor is separated from the consumers. Although it produces electricity however the breaking not occurs because of missing burden. Through the resistance can be the starting voltage of model controlled. Because a too high set starting voltage delimits the controlling range it must be selected not too high. E.g. for Roco motors are values between 1,8-4.7 kOhm sufficient.

 The circuit finds room on a platine 10x20 millimeters. Good insulated can it be placed between motor and the wheel contacts.

 On the basis of Modelleisenbahner, 99/3 

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