I Ran a Double SSG in a Closed Single Loop (One Battery)

Hook

I wanted to see what would happen if I chained two SSG circuits together in a closed single loop with only one battery doing both the driving and the receiving. It popped a capacitor at the start, but once everything settled the rotor started turning and the meters showed some interesting numbers.

Watch this experiment

We fired up the double SSG setup on the bench, adjusted the potentiometer on the fly, and watched the rotor slowly gain speed while measuring voltage at the output of the second circuit.

What you'll learn

How two SSG circuits can be wired so the output of one becomes the input of the next, what the coil turns and wire gauges looked like, and what the multimeter actually read while the system ran from a single 12 V battery.

From the bench

The first thing that happened was a capacitor pop, but that was just the initial surge. After hooking the blue wire and confirming the power input, I let the rotor spin on its own. At 900 ohms it was barely moving—maybe one RPM every couple of seconds. You could hear the change the moment I turned the potentiometer down to 800 ohms. The rotor picked up noticeable speed and the whole thing sounded alive.

The battery started at 12.01 V. While running two full circuits it showed a small drop, but the system kept going. I cut power before clipping the multimeter leads because, as I said on camera, I’m brave but not stupid. Once re-energized we saw the output of the second SSG sitting roughly 15–20 V higher than the battery voltage under load.

How it works / what we changed

This circuit is hooked up to the first coil, but the output of that circuit is hooked up to the input of the second circuit, and the output of the second circuit charges the same battery. In between each SSG there is a cap bank so the energy flows completely back without direct backlash. The trigger on the second coil is only half the length of the main winding.

I changed the wiring from having both circuits share one coil to putting the coils in series: first coil drives its SSG, that output drives the second SSG attached to its own coil. That gave better output readings than the previous shared-coil arrangement.

Bifilar SSG closed loop

While we didn’t have an bifilar ssg closed loop on the bench, the wire gauges we used are worth noting for anyone comparing sizes. The first coil is 660 turns of 20 gauge paired with 32 gauge in bifilar style. The second coil is 730 turns of 20 gauge paired with 22 gauge, also in series. The trigger winding on that second coil is half length—730 turns instead of a full 1460. Those numbers gave us a workable balance between drive strength and trigger sensitivity in the closed single loop.

Builder checklist

• Start with one fresh 12 V battery at 12.01 V or better
• Two SSG circuits wired in series (output of first becomes input of second)
• Cap banks between each stage to smooth the return path
• Bifilar coils: 660 turns 20+32 ga and 730 turns 20+22 ga
• Trigger coil half the length of the main winding on the second stage
• Potentiometer in the 800–900 ohm range for initial tuning
• Multimeter ready on the final output—cut power before connecting leads
• Rotor balanced and magnets aligned for easy spin-up

Troubleshooting

At 900 ohms the rotor barely crept—one revolution every couple of seconds. Dropping to 800 ohms gave immediate audible and visible improvement. If the circuit refuses to start, check that the trigger winding polarity and length match the coil it’s sensing. The battery voltage dipped slightly while running both circuits; that is expected in a true closed loop. When the meter would not read cleanly I cut power, re-seated the clips, and tried again—simple but effective.

Safety

Always cut power before attaching meter leads to live high-inductance circuits. I was barefoot on the concrete and still chose to kill the supply first. Capacitors can pop on initial connection; keep your face away and wear eye protection. Even though the voltages stayed modest, the spinning rotor and collapsing fields deserve respect.

FAQ

Why use two SSGs instead of one?

Chaining them lets the output of the first stage drive a second stage so we can see how the energy cascades before returning to the single battery.

Did the battery voltage keep dropping?

It started at 12.01 V and showed a small drop while running both circuits, but the system continued spinning and charging through the cap banks.

What does “closed single loop” mean here?

All current leaves the battery, passes through both SSG stages and coils, then returns to the same battery without a separate charging battery.

Why half-length trigger on the second coil?

The builder noted it gave a cleaner trigger signal relative to the 730-turn main winding on that coil.

Can I replicate this without a potentiometer?

You can, but the pot made on-the-fly adjustment easy while watching RPM and meter readings.

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 Battery Charging

Watch this experiment on YouTube

• ▶ Watch full on YouTube