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Retirement Sale: Save An Additional 20% Off of Our Normal Discount Price
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The contacts in the ARSC's relays are rated at about 3 amps at G-scale voltage. While this is ample for most G-scale locos, it may be inadequate for some, and for MU lashups. To provide more power for G-scale, or other high current draw scales such as Lionel and American Flyer, another relay needs to be used. Relays are generally available at most electronic stores, including Radio Shack. Electronic surplus stores have them extremely cheap. When selecting a relay, you have three things to consider: • Contacts rated with adequate
amperage for your application Ideally, you'll find something in the range of 5- to 10-amp contacts, with activating coils operating on 20 volts AC. Considering that 12-volt DC relays are more readily available, steps can be taken to accommodate them, or any other relay operating on less than 20 volts. The wiring schematic here shows using a DC relay. If you've managed to find an AC relay of the proper voltage, you can eliminate the rectifier bridge and hook the portal wires directly to the relay coil. |
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The bridge rectifier
only has to be rated at the relay's power consumption, not the track
power consumption. In lieu of a bridge rectifier, you can use a set
of four diodes to make the bridge rectifier, as illustrated at right. |
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Lastly, if you need to reduce the voltage to the relay coil, you can insert a resistor or a series of diodes. Each diode will reduce the voltage by about 0.7 volt. Place them between the rectifier bridge and relay. Resistors vary, so if you opt to use a resistor for voltage drop, you'll have to use trial and error to find the correct resistor. If the polarity in the reverse section is wrong after you get this connected, simply reverse the reverse section wires. |
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