If you can run at good RPM , and connect the shaft (screw) and the magnet to a wires like this watch?v=hXbFfMBW97A, you have an extra ennergy (homopolar generator de palma´s N MACHINE
mochiam---The bifilar coil is 75ft. of 26 ga (drive)and 200ft. of 30ga(trigger) wound together untwisted. I use the radio shack stuff and just wind it up on one of the spools that comes in the package. The core is just small nails and epoxy. I have used this simple coil on many sucessfull projects.
did you see the link that i gave you last time? or use bismuth... much better than that because neomagnet will float rather than top which is touching surfaces..
Hey Lidmotor, if you are going to build the Cyberpcb Levitron project based on the 741 opamp it should be great. You are basically building a servo controller system based on negative feedback. That means that the 741 amplifier will output a voltage to fire the electromagnet to keep the voltage at its + and - imputs at zero. The Hall sensor feeds a voltage to the + input and the 741 output is massaged and is fed back to the - input.
So this is effectively an analog computer on a single mission, to keep the object suspended at a fixed distance from the electromagnet. If the object is too high, the analog computer servos back using negative feedback to lower it to the set position. If too low then the negative feedback operates to raise the object. Sometimes these systems can oscillate up and down around the set position and need to be damped to stop the oscillation. Power steering in a car works the same way.
You may want to read up on the 741 opamp. You can configure it with resistors akin to a 555 timer. You can use it to add and subtract and multpily voltages, which are computer functions again but being done in the analog domain.
There are literally thousands of uses for it and if you poke around you may find something useful. For example using it to amplify a tiny pick-up coil signal using it as a comparitor. The opamp output could fire your main transistor with very sharp on/offs.
"That means that the 741 amplifier will output a voltage to fire the electromagnet to keep the voltage at its + and - imputs at zero."
A clarification: It's the DIFFERENCE between the + and - inputs that the feedback circuit will work to keep at zero volts.
An opamp is simply an amplifier with super high amplification between the + and - imputs. That's all it can do. The trick is to feed back the output signal back to the - input with resistors to "tame the beast" and get your desired gain.
Wow! You are some kind of mind reader. Thanks for the explanation of what I am going to attempt. That is exactly where I'm headed. I will have to do some research on the 741 opamp like you said to understand what is going on. More learning----but fun.
Mart-- It reminds me of a joule thief more than a Bedini. I have not done any long run tests on it. This is more of a novelty thing for me. Its fun to watch and play with.
If you can run at good RPM , and connect the shaft (screw) and the magnet to a wires like this watch?v=hXbFfMBW97A, you have an extra ennergy (homopolar generator de palma´s N MACHINE
alex681219 2 years ago
This is similar to regenerative acceleration.
Anothercoilgun 2 years ago
Hi Lid a question how the bifilarcoil is wounded up? Tnx
mochiam 2 years ago
mochiam---The bifilar coil is 75ft. of 26 ga (drive)and 200ft. of 30ga(trigger) wound together untwisted. I use the radio shack stuff and just wind it up on one of the spools that comes in the package. The core is just small nails and epoxy. I have used this simple coil on many sucessfull projects.
Lidmotor 2 years ago
The easiest the better. Thanks Lid always a pleasure
mochiam 2 years ago
Lid great explanation on the circuit keep up the great work cheers from mtl !
megavox 2 years ago
megavox----Thanks.
Lidmotor 2 years ago
did you see the link that i gave you last time? or use bismuth... much better than that because neomagnet will float rather than top which is touching surfaces..
kenshin32 2 years ago
kenshin32---- I am working on a full floating rotor but not the bismuth way. It will be done electronically
Lidmotor 2 years ago
godspeed :) hope you will beat the 50,000+ rpm and rev up some more speed!
kenshin32 2 years ago
Hey Lidmotor, if you are going to build the Cyberpcb Levitron project based on the 741 opamp it should be great. You are basically building a servo controller system based on negative feedback. That means that the 741 amplifier will output a voltage to fire the electromagnet to keep the voltage at its + and - imputs at zero. The Hall sensor feeds a voltage to the + input and the 741 output is massaged and is fed back to the - input.
Drevtoobe 2 years ago
So this is effectively an analog computer on a single mission, to keep the object suspended at a fixed distance from the electromagnet. If the object is too high, the analog computer servos back using negative feedback to lower it to the set position. If too low then the negative feedback operates to raise the object. Sometimes these systems can oscillate up and down around the set position and need to be damped to stop the oscillation. Power steering in a car works the same way.
Drevtoobe 2 years ago
You may want to read up on the 741 opamp. You can configure it with resistors akin to a 555 timer. You can use it to add and subtract and multpily voltages, which are computer functions again but being done in the analog domain.
There are literally thousands of uses for it and if you poke around you may find something useful. For example using it to amplify a tiny pick-up coil signal using it as a comparitor. The opamp output could fire your main transistor with very sharp on/offs.
Drevtoobe 2 years ago
"That means that the 741 amplifier will output a voltage to fire the electromagnet to keep the voltage at its + and - imputs at zero."
A clarification: It's the DIFFERENCE between the + and - inputs that the feedback circuit will work to keep at zero volts.
An opamp is simply an amplifier with super high amplification between the + and - imputs. That's all it can do. The trick is to feed back the output signal back to the - input with resistors to "tame the beast" and get your desired gain.
Drevtoobe 2 years ago
Wow! You are some kind of mind reader. Thanks for the explanation of what I am going to attempt. That is exactly where I'm headed. I will have to do some research on the 741 opamp like you said to understand what is going on. More learning----but fun.
Lidmotor 2 years ago
Ha ha! I looked at your recent activity. A juicy search would be "741 application notes."
Drevtoobe 2 years ago
omg ideas. 1 bedini circuit, 8 rotors on a wheel that turns, spining them all up .
rroge5 2 years ago
Have you run tests on this to see how long it will go? Curious.
marthale7 2 years ago
Mart-- It reminds me of a joule thief more than a Bedini. I have not done any long run tests on it. This is more of a novelty thing for me. Its fun to watch and play with.
Lidmotor 2 years ago