I Put a Dual Bifilar Coil on 3 Volts and Watched the Pickup Coil Stack Voltage

Hook

I fired up a dual bifilar coil at 3 volts each and the real surprise was how fast the pickup coil stacked 38-39 volts DC onto the cap bank. We talked about putting another coil under it to chase a little self-running fun.

Watch this experiment

We ran the dual bifilar coil, measured the pickup coil output, killed the power and watched residual spin still make DC. Then we brainstormed closing the loop with another coil.

What you'll learn

You’ll see real voltage numbers from a dual bifilar coil setup, hear honest talk about energy conservation, and get ideas for stacking coils without any hype.

From the bench

The phone was upside down but the meter was right side up. I turned the supply to 3 volts on each half of the dual bifilar coil. The pickup coil sitting above it immediately started pushing 38 then 39 volts DC onto the capacitor bank with no load connected. We could see the voltage climbing on the meter. When we cut power the residual spin kept generating a dwindling DC voltage for a bit. That part felt like a win even though we know it won’t last.

How it works / what we changed

The drive coil and the pickup coil together make an awesome combination. The dual bifilar coil is basically two bifilers wound together in one package. I don’t think I’ve seen anyone else try that exact layout. We ran each bifilar at 3 volts on its own channel. The pickup coil feeds a cap bank that we plan to use as a power source for a second coil. Changing the electricity through electrolytic caps, then other caps, then the meter is a whole chain of transformations. That changes the form but can’t create more energy than we started with.

Put another coil under

I’m thinking I could put another coil under here that runs on 3 volts. Hook it up on a different transistor and use the cap bank from the pickup coil as its power supply. When the first one slows the second one might keep the rotor turning for a little while on the residual spin. I’m not saying forever, just long enough to make a neat toy.

Pickup coil together make

This coil right here, the drive coil and the pickup coil together make an awesome combination. The way the dual bifilar coil throws flux and the pickup coil catches it seems to work really well. I’m looking forward to hooking a real load to that cap bank and seeing what we can actually run.

Pickup coil

What I really wanted to focus on wasn’t the power going into the dual bifilar coil. It was this pickup coil. It’s hooked up to the cap bank and we watched the DC voltage coming out of it climb to 38-39 volts with no load. Even after we cut power the residual spin kept the pickup coil generating a bit more DC while it slowed down.

Filer coil

It’s two by filers in one coil. That’s awesome. I don’t think it’s ever been done before. So that’s three volts in on each bifiler. The dual bifilar coil is basically two complete bifilar windings sharing the same core and space.

Another coil

I’m thinking I could put another coil under here that runs on 3 volts. Hook it up on a different transistor. Hook that up as its power supply. So when I do this, it will run. It will continue to function for a little while. I’m not saying forever. Even a few extra seconds of spin from residual magnetism would be cool to show the kids.

Coil under

We talked about putting a coil under the existing setup so the cap bank from the pickup coil could feed it. I also tried putting stuff like copper plates or other materials underneath or near the magnets and hooking probes to them. We got zero voltage reading from the copper plate test. Electricity will travel through it but we saw nothing on the meter.

Coil together

The drive coil and the pickup coil together make an awesome combination. We plan to start both running at the same time then turn the original power supplies off and see if the pickup coil’s cap bank can keep the second coil going on its own for any length of time. I know it’ll start running. I can’t wait to find out.

Builder checklist

• Dual bifilar coil wound as two separate bifilar sets in one package
• Separate pickup coil positioned to catch flux (we used the one that gave 38-39 V)
• Capacitor bank to store output from the pickup coil
• Second drive coil on its own transistor ready to connect to the cap bank
• Multimeter or scope to watch voltage while spinning down
• 3 V supply for initial run
• Rotor with magnets balanced and spinning freely

Troubleshooting

If your pickup coil voltage doesn’t climb, check that it is wired to the cap bank correctly and that the rotor magnets are passing close enough. When we cut power the residual spin still made some DC but it dwindled fast. If you see zero on a copper plate test, that matches what we measured. Oscilloscope might still catch something the multimeter misses.

Safety

We’re dealing with spinning rotors and capacitors that can hold a charge. Keep fingers clear of the rotor. Discharge caps before touching connections. Even at 3 volts the spinning mass has momentum. Wear eye protection if you’re pushing speeds up.

FAQ

Will it self-run forever? My hypothesis is no. The laws of physics say you can’t create energy. We might get a short run on residual spin but it will wind down.

What voltage did the pickup coil make? 38-39 volts DC on the meter with no load. We didn’t measure current yet.

Did the copper plate test work? Zero reading. We clipped probes to a copper plate near the magnets and saw nothing.

Is a dual bifilar coil something new? I haven’t seen two bifilers combined into one coil like this before. It was fun to try.

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Watch this experiment on YouTube

• ▶ Watch full on YouTube