Frequently Asked Questions...
electrical engineering problem?
I am using 9V voltage source, supplying 5V(through voltage regulator) to water sensor, then to bistable multivibrator (active high), which is connected to DPDT relay and then to servo motor. When water sensor is on, motor will rotate in positive direction, when water sensor is off, multivibrator will send logic "0" to relay, which will change the polarity of motor to make it to rotate in negative direction. The question is how can i make motor to rotate for certain amount of time for both cycles. And also can i get a ready multivibrator in electrical shops, because i tried to built it up myself, from circuit i got from internet, it didnt function properly.
If u have better suggestions how to implement the task by using some other components also will be very appreciated. Thank you
Answer:
I guess you have a motor that will pump water into a reservoir or tank. When water drops to a certain low level, one would like to start the motor. IS that what you want? What is meant by reversing the motor?? What happens then?
If you need the motor to drive for a certain time, you need a timer. This is a device when started, will remain On for a specific duration. So you can trigger the device when water reaches a low level, by sensing the level through the water sensor. Then the motor will rotate for a certain time depending on time you have set in timer. When level falls below the min level, the sequence will repeat.
A simple way to get a timer is to use a large RC and a transistor driver for the relay. The capacitor at base can be charged through a diode, when trigger occurs, and the capacitor will keep the transistor ON for a certain time. The transistor can drive the relay. See also timer circuits based on 555.
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Dpdt Off
Xbox 360 With Sickmods Fader With a DPDT Center Off Switch
A portable solar vehicle; fits into a suitcase - just 50lbs
A portable solar vehicle; fits into a suitcase - just 50lbs THEKPV
(The Hybrid Electric Kinetic Photovoltaic Vehicle) Gained momentum in the summer of two thousand-eight by a fellow named Terry Hope. He worked as an engineer aboard the Copper Sky. An 88ft steel haul staysail schooner. The captain would not allow him to bring a full size stand on electric scooter.. If he wanted to bring any electric vehicle aboard the vessel his vehicle had only one option.. fit inside a suitcase. Following about a thousand hours of electric vehicle research & development his personal electric scooter / bike concept materialized with four goals:
Engineer an electrical circuit with a mechanical system to capture, store and harvest electricity.
Incorporate photovoltaics for a prototype electro-solar bike / scooter hybrid.
Eliminate the greenhouse gas emissions or the carbon footprint by recharging the electric vehicle battery pack off-the-grid.
Construct a electric vehicle with a foot print small enough to be stowed away inside a Samsonite suitcase for easy transport.
Terry's prototype electric vehicle will feature two options for recharging the +90% efficient prismatic LiFePO4 main battery pack. One option will be connecting to mains electricity via the onboard AC-DC power supply or an emissions free method by selecting the vehicle integrated solar array.
The integrated electric vehicle solar array consists of 14x 6"x6" mono crystalline solar cells wired in a series and function as fairings or aerodynamic wind cutters which improve the vehicle's drag coefficient value.
The operator controls solar array output via a group of dpdt rocker switches. Directing the output to charge any two batteries/capacitors from either the main 24 volt battery pack, 12 volt battery booster pack or 10.8 volt capacitor bank. The two extra electrical energy storage packs, have been added for extended range functionality.
Harvesting kinetic energy by an extra sprocket mounted on the opposite side of the rear wheel to the electric motor, using five gears engineered to rotate a set of very small 3-phase alternators designed with multi-pole configuration to cut cogging torque. Each of these alternators convert alternating current to direct current with 74% efficiency. The electricity is stored in a bank of ultracapacitors, this power is quickly released via the propulsion booster switch. The regen device's structure is hand-built from polycarbonate.
Video
http://www.youtube.com/watch?v=ZPzUlzIoY1k
About the Author
Inventor, self taught
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