filters noise interference from AC or DC motors to full featured sound system
Some motors generate a lot of RF noise which can adversely affect the proper operation of some sound units. Installing this noise filter kit reduces the motor's noise to allow for proper sound system operation in most all instances. It also reduces the voltage to the Full Featured Sound Systems motor input for installations that operate above 18 volts.
This kit contains 2 resistors, 1 capacitor, and 1 transient voltage snubber to install between the motor brushes and the HiLine™ Sound Systems motor brush input (blue and yellow J1 wires). The need for this in AC type systems is indicated by the lack of Whistle/Horn operation at higher speeds (Steam systems utilizing a synchronized chuff do not need this). DC installations with higher motor voltages, such as those operating on 24vDC systems, should also use this to reduce the motor voltage going to the sound card.
In most cases, this eliminates the electrical noise (RF) produced by the motor brushes and eliminates the problem. Cleaning the brushes and brush commutator plates in series motors also helps.