Recent content by Carl Pugh

I would recommend the Arduino UNO R3. It's low cost. A good book for programming the Arduio is Simon Monk "Programming Arduino, Getting Started with Sketches". The Arduino appears to be very applicable to industry, at least for low volume applications. Besides the UNO, Arduino has more...

Purchase a microwave oven. They are approximately the correct power and frequency.

Yes it is possible to transform a voltage up or down using just a capacitor. If the plates of a capacitor have a charge and the plates are moved closer together or farther apart, the voltage on the plates will change. Capacitor Voltage=Charge/Capacitance So if Capacitance is halved, Voltage is...

The book Physics by Hausmann-Slack has 5 1/2 pages on the derivation of the flux density on the central portion of a straight solenoid. Physics book gives the field intensity as H=4PiNI/10l H=field intensity in oersteds Pi=3.14 N=Number of turns I=current in amp. l=Length in centimeters

Am I reading this correctly, worst case the contactor has to break 250 amp DC at 4500 volt DC, in air at sea level?

3000 volt DC is very high for a contactor using contacts that open in air. What current are you operating at? Have you considered a vacuum contactor?

To decrease the closing time, you have to have less resistance to closing (Weaker springs or lower mass) or a stronger solenoid. (For a stronger solenoid you need a larger solenoid or higher ampturns on closing or maybe a different designed solenoid or maybe a DC solenoid). To decrease...

I don't have any answers, but do have some questions. At 35,000 feet the breakdown voltage of air is much less than at sea level. Would there be a problem with cable terminations breaking down at 35,000 feet? Would cable have corona at 35,000 feet? (Very short life) Cooling of cables will be...

Why don't you just make all the particles small, then you wouldn't have to separate them? Why not forget using charge to separate the large and small particles and just slowly put particles is a vertical shaft with a small cross draft of air. The cross draft of air will cause the small...

My thinking is that the opposite charged particles attract each other and by the time they get to the bottom, they have neutralized each other.

There were some experiments where they were trying to measure the charge of one electron. They would charge a small particle and keep it at a constant height between two plates that were at different voltages. They then calculated the weight of the particle and the force required and the force...

Word of caution, consumer audio amplifiers are rated for momentary wattage. If you order a consumer audio amplifier, for 30 watts continuous, you will require something like a 150 watt amplifier. Industrial audio amplifiers are rated for continuous wattage, so for 30 watt you will require a 30...

There are so many variables in this example, that it may be easiest to just perform tests.

For very large capacitors, the discharge current is high enough to damage the capacitors internal connections. It's always a good idea to use a resistor to discharge a large capacitor. A resistor may be required to limit the capacitor discharge current to less than the discharge device's current...

Try Googling "power over fiber optic", you may be able to purchase something that has already been designed. Good Luck Carl