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Electronics questions about AC, DC and digital theory.

Experience in the area

Graduate electrical engineer with over 40 years in electronic design, manufacturing, project organization and patent review. Experience in fields of industrial and consumer electronics (audio, video, acoustics, etc.)


IEEE (Institute of Electrical and Electronics Engineers); Senior Life member AES (Audio Engineering Society), Fellow Life member


BSEE University of North Dakota

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Recent Answers from ZZ

2017-02-13 Electrical devices support for Dual input voltages.:

It's a "yes" for very low power devices. For example, many power supplies for laptop computers already have universal power supplies.    It's a "no" for devices that use bigger power and especially those

2017-02-12 Mathematical constants with units.:

I am not a strong enough expert in this area to give you a precise answer.    Have you googled for it?  Lots of information online for these kinds of things.    My opinion:  There are many, many constant

2017-02-05 Wallpaper fixing in commercial aircrafts.:

I am not an expert in this area.     I can say from commercial flights I have taken over the years the passenger cabins have decorative surfaces that appear to be hard surfaces such as metal like aluminum

2017-02-01 Help for Project:

I would replace the k1 relay with a double pole 3 position relay and use the extra contacts to operate the motor.  I haven't exactly decided the best relay and how to wire it but the motor should be on

2017-01-31 Seats location in Commercial airlines.:

Sorry, but I am not an expert in this category and I have no worthwhile opinion.  But my guess is that the airline can configure the seating arrangement for the better of passenger safety and comfort while


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