Amp Funnel Coil: 8-Magnet Pulse Motor Lab (EP:1)

Hook

I call this the give and take because nothing runs itself. We pull from one battery and feed another on this new amp funnel coil pulse motor. First episode, first measurements, and already three pickup coils are making power.

Watch this experiment

I spin the eight-neo rotor by hand and you can see the scope jump every time a magnet passes a coil. The truncated Bedini circuit kicks in and the charge battery starts climbing.

What you'll learn

How I wired three different gauge combos on the drive coils, why the trigger strands run in series, what the amp funnel effect looks like on the bench, and why I deliberately avoid the “proper” boxed method so we can grow new ideas.

From the bench

The rotor is an eight magnet eight coil design. Behind each drive coil sits a pickup coil for generation. Right now three pickups are mounted and wired. The first drive coil is 16 and 30 gauge, the next two are 20 and 30 gauge. That 16/20 combo works really well with 12 volts from what I measured.

How it works / what we changed

I’m running a truncated Bedini circuit. Two motor sections share one primary battery and charge a second battery. Positive leaves the battery through the green power lead, hits the 16 gauge coil first, then the 20 gauge, then jumps to the next 20 gauge clip. All bifilar trigger strands from the three active coils are hooked in series so they act as triggers for each other. That series chain makes the whole setup way more functional than I expected.

pulse motor

This is an eight magnet eight coil pulse motor. The neo wheel spins past the drive coils and each pass induces a small boost in the pickup coils. I’m measuring how much actually returns to the charge battery while the primary keeps the rotor turning. Early readings look promising but I didn’t get a clean average yet because I keep changing connections.

Bedini circuit

The circuit is a truncated Bedini. One battery runs both motor halves and the pickup energy goes to a separate charge battery. I could wire it for a negative spike but I’m testing this layout on purpose. The cat bank sits between the two motor sections to smooth things out.

truncated Bedini

By truncating the classic Bedini I only use two drive sections instead of the full ring. Both still share the same primary battery. This lets me watch the give and take more clearly while I decide whether to finish all eight coils or keep experimenting with three.

pickup coils

Three pickup coils are already behind the drive coils. Every magnet pass gives a small generation spike. Those spikes feed the charge battery. I plan to add the remaining five once I’m happy with the trigger and drive behavior on the first three.

bifilar coil

The pickup and some drive coils are bifilar 26 and 32 gauge. I connect the two strands in series first, then parallel the pair. That gives me the amp funnel effect where the thicker 26 gauge pushes into the thinner 32 gauge and creates a burst. At least that’s what I’m measuring. Electricity doesn’t flow exactly like water so the scope is my main reference.

amp funnel effect

When you run the 26 gauge first then hit the 32 gauge you get a bottleneck that feels like a fire-hose burst on the rotor. I’m still dialing the diode direction—forward seems to help. More bench time is needed but early spins show the rotor speeds up when I use this wiring.

trigger strands

All three bifilar trigger strands are wired in series and used as triggers for the drive coils. That single series chain really wakes everything up. If I go to eight coils I’ll run all eight trigger strands in series too. You’ll probably need 55 volts at the end but the extra triggers make it worth it.

pulse motor rotor

The rotor holds eight neo magnets evenly spaced. Balance is good so far. I’m watching rpm and back emf spikes while I adjust coil gap. The goal is smooth rotation while still pulling usable spikes into the charge battery.

back emf

Every time a magnet leaves a coil you get that back emf spike. In this truncated Bedini layout those spikes help charge the second battery. I’m measuring them with the scope but I didn’t catch a clean peak reading yet because I kept swapping wires.

pulse motor battery charging

The whole point of the give and take is to see how much the pickup coils actually return to the charge battery. Early tests show a small but steady climb. I’ll keep logging voltage and current as I add more coils and refine the trigger chain.

Builder checklist

• Eight neo magnets glued and balanced on rotor
• Drive coils: 16/30 and 20/30 gauge combos for first three positions
• Bifilar 26/32 gauge for triggers and pickups
• Trigger strands wired in series
• Truncated Bedini circuit with primary and charge battery
• Scope hooked to watch back emf and charge current
• Green power lead from battery positive to first 16 gauge coil

Troubleshooting

If the rotor won’t spin, check that all trigger strands are in series and polarity on the coils matches. If speed is low, try swapping the order of the 26 and 32 gauge in the bifilar pair. I didn’t get a clean reading on the exact voltage needed for eight coils yet so start at 12 V and creep up.

Safety

Neodymium magnets are strong—watch your fingers. The spinning rotor can grab loose wires or tools. Keep the bench clear. Batteries can supply decent current so use proper fusing on the primary side. I’m wearing eye protection when I first fire it up after a wiring change.

FAQ

Do I have to use the exact 16/20/30 gauge combo? No. That’s what worked for me at 12 volts. Start with what you have and measure.

Will this run forever on one battery? No. It’s a give and take. The charge battery climbs but the primary still drains slowly.

Why series triggers instead of parallel? Series made the three-coil setup way more functional. I’ll test parallel later.

Is the amp funnel effect real? It looks promising on the bench but electricity doesn’t flow like water so I’m still collecting more scope shots.

Related on this site

• How to Build a Pulse Motor: Parts, Coil Gap, First Spin
• Bedini Motor & SSG Circuit Guide (Beginner Bedini Explained)
• Best Wire Gauge for Pulse Motor Coils (AWG Guide)
• Pulse Motor vs Bedini Motor: What's the Difference?
• Can a Pulse Motor Charge Batteries? What Experiments Show

Watch this experiment on YouTube

• ▶ Watch full on YouTube