Part Number: 0900-34, 0900-35, 0900-36

Q: I hear a high-pitched whine when using my television or VCR in my car with your inverter. What's causing this?

A: Inverters work by switching the voltage from the car off and on at a very fast frequency. This can produce an electrical "noise" which can be picked up and amplified by some audio devices including a TV or VCR. Unfortunately, this is a function of the audio devices design and can not be corrected.

This type of "noise" can also be generated by the car's ignition system. Car stereos are designed to filter out this noise but since televisions and VCR's are intended for home use, they do not have the same filtering built in.

You can determine whether the "noise" is coming from the inverter or the ignition by turning off the car while operating the inverter. If the noise goes away when the car's engine is off, then the noise is coming from the car's ignition and a filter can be purchased at most auto parts stores that will correct the problem.