Bedini SSG: First Induction Coil Under Big Coil & Scope Readings

Hook

That little tiny nudge on the rotor gave us 10 volts right away. I had the first induction coil sitting underneath the drive coil, wired in series to the big coil, and the Bedini SSG circuit running with both primary and charge batteries. The scope showed exactly how the two coils layered their waves on top of each other.

Watch this experiment

I fired up the multimeter, gave the rotor the smallest push, and the meter jumped to 10 volts. Then I switched on the full Bedini SSG setup. You could hear the motor change pitch once everything engaged. Later I added the second drive strand from the power supply and the speed climbed even higher while the scope kept painting that signature waveform.

What you'll learn

You’ll see exactly where I placed the first induction coil, how I combined it with the big coil, what the oscilloscope showed, and why running the Bedini circuit first before adding the power supply gave the best speed-up. All straight from the bench, no theory fluff.

From the bench

The setup used a Bedini SSG circuit with primary and charge batteries. The first induction coil sits directly underneath the drive coil. It is wired in series to a nice-sized 32-gauge coil that weighs 1.5 lb. I just threw a bunch of higher-gauge wire into the same coil and immediately saw more voltage. At one point the meter was reading 35–36 volts. When I turned on the power supply we were pulling 600–650 mA at 8 volts and the rotor was spinning insanely fast.

How it works / what we changed

The wave coming off the big coil and the wave from the bottom coil combine. On the scope the sloping part is clearly the big coil. All the fuzzy business on the top and while sloping down is the induction from the coil underneath. I also ran a dedicated trigger strand (the gold one) that is pure Bedini SSG except I didn’t have a potentiometer. The 20-gauge strand was hooked to the power supply. Starting the Bedini first, letting it build, then adding the power supply made it speed up a lot. After cutting the supply the speed did not drop all the way back down because the Bedini side keeps creeping up.

Big coil

The big coil is 1.5 lb of 32-gauge wire. Its wave shows up on the scope as the main sloping line. It feels like it produces more voltage but in a subtler, more inclined way. When the rotor is spinning the big coil contributes the dominant part of the induction sequence that we measured at 35–36 volts.

Same coil

I used the same coil but added a bunch of higher-gauge wire inside it. That change gave noticeably more voltage. The construction stayed basically the same — just more wire of a different gauge stuffed into the same form. You can see the result on the meter and on the scope where the two contributions sit right on top of one another.

First induction coil

Our first induction coil is positioned underneath the drive coil. It is wired in series with the big coil so their outputs add together. On the scope the fuzzy high-frequency content riding on the big coil’s slope comes from this bottom coil. Even after power is cut you can still see the blip from the little coil on the bottom.

Builder checklist

• Place first induction coil directly under the drive coil
• Wire it in series with the 1.5 lb 32-gauge big coil
• Use a dedicated Bedini trigger strand (gold wire in my case)
• Have primary and charge batteries connected to the SSG circuit
• Keep a power supply ready on the second drive strand (20 ga)
• Monitor with both multimeter and oscilloscope from the start
• Start Bedini first, let it build, then add power supply

Troubleshooting

If the waveform looks like a tornado on the scope, recenter the probe on the little bottom coil blip. When speed drops too much after cutting the supply, make sure you let the Bedini circuit build momentum before adding the power supply. If voltage seems low, add more turns of higher-gauge wire into the same coil form.

Safety

Keep voltages under control — we saw spikes approaching 200 V even after cutting power. Watch your fingers around a rotor that’s “super duper fast.” The power supply pulled over 600 mA at 8 V so use appropriate fusing. The cactus experiment nearby was just for fun but keep any plants or water away from live circuits.

FAQ

Why place the first induction coil underneath the drive coil?

It lets the two waves combine cleanly. The bottom coil adds its fuzzy induction on top of the big coil’s slope.

Can you really run Bedini SSG and a power supply through the same coil?

Yes. In this test they helped each other. Starting with Bedini first then adding the supply gave the biggest speed increase.

What does the scope show for the big coil versus the bottom coil?

The sloping line is the big coil. The fuzzy stuff on top and on the way down is the induction from the first induction coil underneath.

How much voltage did a tiny nudge produce?

Just the smallest push gave a clean 10 volts on the meter.

Related on this site

• How to Build a Pulse Motor: Parts, Coil Placement & First S
• Bedini Motor & SSG Circuit Guide (Beginner Bedini Explained)
• Reading Oscilloscope Output on a Pulse Motor
• Best Wire Gauge for Pulse Motor Coils (AWG Guide)
• Pulse Motor vs Bedini Motor: What's the Difference?

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