Uploaded February 2026 | Updated September 2026, 2 weeks ago
LaserSaber SJR Looper circuit revisited - with a hybrid twist. In this video I build and test the classic ultra-efficient looper circuit, exploring coil winding, capacitor choices, transistor swaps, and real runtime performance.
The LaserSaber SJR Looper was one of the most impressive minimalist circuits of its time, known for producing visible light from extremely small energy sources. In this video, I revisit the original design more than a decade later, build it step-by-step, and test how different ceramic capacitors affect brightness, flashing behavior, and runtime.
We look at coil construction, component values, transistor options, and practical experimentation — all with real measurements and no shortcuts. This is a relaxed, hands-on revisit of a classic circuit many electronics hobbyists will remember.
If you built one years ago — or are discovering it for the first time — this video shows why the SJR Looper is still worth exploring.
Chapters
0:00 LaserSaber SJR Looper Overview
0:16 Classic Circuit Background
0:28 Coil Winding Details
0:44 Board Layout And Components
1:13 Circuit Assembly
2:04 First Power Up Test
2:30 Capacitor Runtime Experiments
3:19 Ceramic Capacitor Comparisons
4:30 Constant Light vs Flashing Mode
5:20 Efficiency Discussion
5:58 Why The SJR Looper Still Matters
7:16 Extended Runtime Test
8:05 Final Results And Thoughts
You can find my books on Amazon -young adult and sci-fi
Such as:
Fixing Time - amazon.com/Fixing-Time-Mark-Vaughan-ebook/dp/B07YQCZ162
The Beacon/ The Beacon 2 -amazon.com/Beacon-Battle-Nuclear-Creek-Combined-ebook/dp/B084Q37TKV
The Agaileia Trilogy - amazon.com/Agaileia-Trilogy-Mark-Vaughan-ebook/dp/B07ZN76B19
Agaileia vs Sherlock Holmes - amazon.com/Agaileia-Sherlock-Holmes-Mark-Vaughan-ebook/dp/B087N6HM5S
A Question Of Worth - amazon.com/Question-Worth-Mark-Vaughan-ebook/dp/B082PJFTZG
Enjoy my Playlists -
Wireless Electricity: youtube.com/watch?v=yYoYyuR1KuI&list=PLIhGrBMUdssWpFSLW1hznwNqXWpCxhDRQ
Electronics Projects: youtube.com/watch?v=F4nfaYkGvQI&list=PLIhGrBMUdssWLQWtW4dWWGgh25XG3HXek
Solar Projects: youtube.com/watch?v=nmKfxI4MTTs&list=PLIhGrBMUdssXu9Pmduvopm02_7IMz8d3M
Reviews: youtube.com/watch?v=8jAJysXXsw8&list=PLIhGrBMUdssUYzRgA1mrp18zwpTtClmov
💼 Business and reviews email:
youtube.scoop273@passinbox.com
#Electronics #DIYElectronics #CircuitDesign
LaserSaber SJR Looper circuit revisited - with a hybrid twist. In this video I build and test the classic ultra-efficient looper circuit, exploring coil winding, capacitor choices, transistor swaps, and real runtime performance.
The LaserSaber SJR Looper was one of the most impressive minimalist circuits of its time, known for producing visible light from extremely small energy sources. In this video, I revisit the original design more than a decade later, build it step-by-step, and test how different ceramic capacitors affect brightness, flashing behavior, and runtime.
We look at coil construction, component values, transistor options, and practical experimentation — all with real measurements and no shortcuts. This is a relaxed, hands-on revisit of a classic circuit many electronics hobbyists will remember.
If you built one years ago — or are discovering it for the first time — this video shows why the SJR Looper is still worth exploring.
Chapters
0:00 LaserSaber SJR Looper Overview
0:16 Classic Circuit Background
0:28 Coil Winding Details
0:44 Board Layout And Components
1:13 Circuit Assembly
2:04 First Power Up Test
2:30 Capacitor Runtime Experiments
3:19 Ceramic Capacitor Comparisons
4:30 Constant Light vs Flashing Mode
5:20 Efficiency Discussion
5:58 Why The SJR Looper Still Matters
7:16 Extended Runtime Test
8:05 Final Results And Thoughts
You can find my books on Amazon -young adult and sci-fi
Such as:
Fixing Time - amazon.com/Fixing-Time-Mark-Vaughan-ebook/dp/B07YQCZ162
The Beacon/ The Beacon 2 -amazon.com/Beacon-Battle-Nuclear-Creek-Combined-ebook/dp/B084Q37TKV
The Agaileia Trilogy - amazon.com/Agaileia-Trilogy-Mark-Vaughan-ebook/dp/B07ZN76B19
Agaileia vs Sherlock Holmes - amazon.com/Agaileia-Sherlock-Holmes-Mark-Vaughan-ebook/dp/B087N6HM5S
A Question Of Worth - amazon.com/Question-Worth-Mark-Vaughan-ebook/dp/B082PJFTZG
Enjoy my Playlists -
Wireless Electricity: youtube.com/watch?v=yYoYyuR1KuI&list=PLIhGrBMUdssWpFSLW1hznwNqXWpCxhDRQ
Electronics Projects: youtube.com/watch?v=F4nfaYkGvQI&list=PLIhGrBMUdssWLQWtW4dWWGgh25XG3HXek
Solar Projects: youtube.com/watch?v=nmKfxI4MTTs&list=PLIhGrBMUdssXu9Pmduvopm02_7IMz8d3M
Reviews: youtube.com/watch?v=8jAJysXXsw8&list=PLIhGrBMUdssUYzRgA1mrp18zwpTtClmov
💼 Business and reviews email:
youtube.scoop273@passinbox.com
#Electronics #DIYElectronics #CircuitDesign
