[tomj76]

p { margin-bottom: 0.08in; } As a working Electrical Engineer specializing in high frequency microelectronics, I can offer some feedback on two of the technical claims you've made for your device.



> Lower impedance means more noise is converted into power!


>10 X 1000uF, 35V, 105°C high ripple current, low ESR electrolytic capacitors will run cool for years to come without losing electrolytes. The impedance is so low it eats up electrical noise at frequencies of up to hundreds of kilohertz and converts them into voltage.


1) The spectral content (the frequencies contained in the time based wave forms) of automotive noise cover a very wide range, easily covering from a few 100 Hz to 100's of MHz. Much of this noise is created by the engine's electrical systems (spark and injectors are the most notable). The very rapid voltage and current transitions can lead to strong high frequency noise. It is a very challenging electrical noise environment.

2) Complete filtering of the high frequency signals present in a automotive environment requires circuitry employing multiple bypass capacitors, because each one has a fairly narrow "sweet spot" of frequencies that it can effectively filter. It is not uncommon to see capacitor banks employing three to five different values to cover the fully range needed in a given manufacturer's circuit. To suggest that your circuit using only two values capacitor can do an superior job over those circuits is just incorrect.

3) The automotive battery not only stores the charge needed for the starting system, but it also acts as a good, very large capacitor, providing a great deal of filtering. It works so well that most cars will not operate without one because of the extreme noise that is present without it.

4) In an electronically noisy environment, electrical filters must be placed at the points where stable voltages are required. Points in the system that are located on the opposite side of the vehicle from the filter, separated by a substantial length of wire (study wire inductance) will behave as if no filter were ever added. Your circuit, which appears to by applied at the dashboard power connector, connected with a relatively long wire, is so far removed from the engine environment that will not be effective beyond a few kilohertz.

5) Believe it or not, automotive engineers are fully aware of the the negative effects of electrical noise on the car's operation and reliability. They already design filters into their circuits, located at the point where they are most needed.

Finally, to the points made previously, for any given driver, a 1 mpg increase in fuel efficiency is not measurable, because driving conditions accurately enough to do a side-by-side comparison. What you're really selling is an automotive voltmeter, and while that might be desirable to some, I don't see any other value in the product.