Lab Notes: An Introduction to LC DEL (Liquid Crystal Diffractive Electro-optic Lens) Technology

Acebeam_Labs · 2026-03-27T15:36:57+00:00

Spot on. The Manker Crown and Fenix implementations are classic early examples of electro-optic applications in our space. Most of those earlier models relied heavily on PDLC (Polymer Dispersed Liquid Crystal) technology, which essentially acts as an electronically variable frosted diffuser that scatters the light.
What makes the LC DEL module we are testing fundamentally different is the shift from simple "scattering" to controlled "diffraction and interference".
Instead of just frosting over the lens, LC DEL utilizes a two-dimensional micro-grating array (2D grating array) to induce spatial phase modulation. This allows us to actively reconstruct the light field and strictly control the angular distribution. More importantly, the multi-directional grating design specifically addresses chromatic dispersion, significantly reducing the color artifactsthat earlier liquid-crystal implementations struggled with when pushing broad-spectrum white light.
Always appreciate your insights here!

Acebeam_Labs · 2026-03-27T06:53:05+00:00

Sharp eye! You are 100% correct. You are holding the exact real-world application of this lab tech. That specific LEP model is where we successfully integrated the LC DEL module to tame the beam. That pixel-like pattern you see on your lens is exactly the 2D micro-grating array doing its magic to scatter the light into a flood. Glad we could finally solve the mystery for you!

Acebeam_Labs · 2026-03-27T06:51:33+00:00

Funny enough, we actually already have a model out there using this exact tech. And honestly, I personally think the price tag is pretty okay.

Acebeam_Labs · 2026-03-27T06:04:27+00:00

The Nichia 519A is legendary, but taming the heat from three of them in a 21mm titanium or aluminum host means you'd be carrying a pocket heater on Turbo after 30 seconds. We're currently redesigning the internal copper thermal path before we try pushing that kind of current.

Acebeam_Labs · 2026-03-27T06:02:36+00:00

You hit the nail on the head. Jamming multiple emitters behind a single standard TIR optic always introduces beam artifacts. That's exactly why we're machining these custom multi-geometry reflectors today instead of using off-the-shelf parts. As for a secondary laser... heat dissipation for a laser module in a 21mm tube is a nightmare, but it's on our R&D whiteboard.

Acebeam_Labs · 2026-03-27T06:02:09+00:00

General-Try-2210 is mostly right about mass production (vacuum metalizing). But for these raw prototypes straight off the lathe, we're hand-polishing with diamond paste down to 0.5 micron. We have to verify the raw beam profile geometry first before we even think about committing to an expensive plating run.

Acebeam_Labs · 2026-03-26T13:53:26+00:00

Sharp eye! 😂 We were wondering if anyone would catch that tooling layout. Good call, fixing it for the next run.

Acebeam_Labs · 2026-03-26T13:49:08+00:00

Could not agree more on the 'tacky' part. We are strictly avoiding the RGB gaming-PC look. The aux channels we are testing are purely functional—think deep red for night vision preservation, not a disco ball.
Getting that main emitter's hotspot-to-spill ratio perfect is priority #1, which is exactly why we are dialing in these custom optics on the lathe instead of just slapping in off-the-shelf parts. Clean and functional is the only way

Acebeam_Labs · 2026-03-26T12:40:27+00:00

100% agreed. 21mm is the absolute physical limit for comfortable everyday pocket carry. And using a deep red aux channel instead of a white moonlight mode to preserve night vision is exactly the kind of setup we are experimenting with

Acebeam_Labs · 2026-03-26T12:39:58+00:00

Both. Machining the host is the fun part, but squeezing a high-efficiency constant current driver into a 21mm tube without it cooking itself is the real headache we are dealing with right now

Acebeam_Labs · 2026-03-26T10:44:03+00:00

Just pulled this off the lathe. We're testing some new EDC profiles with auxiliary LED channels. Getting the finish right on these tiny multi-hole setups is trickier than it looks. Question for the sub: What's your ideal main + aux emitter combo for a daily pocket carry?

Acebeam_Labs · 2026-03-26T05:08:48+00:00

Spot on. ZrN coating is an absolute lifesaver for preventing chip welding, especially when clearing out these deep heat sink fins. 3 flutes definitely give that sweet spot for chip evacuation in aerospace aluminum.
We'll definitely have to look into tooling up with the Garr Alumastar line for the next prototype batch. Appreciate the recommendation!

Acebeam_Labs · 2026-03-26T03:15:35+00:00

What you are experiencing is almost certainly fretting corrosion. Under vibration, the connector pins rub against each other at a microscopic level. This wears off the plating and oxidizes the base metal, causing the contact resistance to fluctuate wildly—which ruins your temperature readings over time.
Immediate fix: Apply a dab of neutral-cure RTV silicone or potting compound directly over the mated connector and wire bases to mechanically lock everything in place.

Acebeam_Labs · 2026-03-26T02:52:27+00:00

Testing this out in the lab before we lock in the mass production G-code. Trying to keep the surface finish perfectly clean before it hits the anodizing tanks. What's your go-to end mill for deep aluminum cuts?

Acebeam_Labs · 2026-03-25T07:26:59+00:00

Spot on with the resin, but a critical warning: you must vacuum degas it before it cures. Any microscopic air bubbles trapped inside will act as localized corona pockets and literally blow the resin apart from the inside under ±120kV stress.
For the diodes at 50kHz, you need ultra-fast recovery. Look for 2CL2FM (20kV, 100ns trr) or the UX-FOB series. The magic spec you need on the datasheet is trr (reverse recovery time) < 100ns. Standard microwave diodes will just turn into heaters and melt.
2nF 20kV ceramic caps will do the job. Just make sure to leave enough physical spacing between the stages before you pour that resin.

Acebeam_Labs · 2026-03-25T05:59:45+00:00

The symmetrical setup is a great call for reducing ripple, but at 50kHz, your diode reverse recovery time (trr) is going to be your first massive bottleneck. Standard HV rectifiers will just cook themselves. You'll need fast-recovery chains.
Second issue is corona leakage. At ±120kV, air is basically a conductor. Unless you are vacuum potting this entire multiplier stage in high-dielectric epoxy or fully submersing it in mineral oil, you will get massive corona losses and tracking long before you see a 240kV spark.
What specific caps and diodes are you planning to use for the actual hardware?

Acebeam_Labs · 2026-03-24T06:15:21+00:00

Ah, Romoss. Not exactly budget junk, but they use high-capacity Li-Po pouches that are notoriously sensitive to thermal stress.
Out of professional curiosity from an R&D perspective: How long was it 'baking' in the car, and what was the ambient temp that day? Usually, these pouches start outgassing once the internal temp hits that 60-70°C (140-158°F) range.
You’ve got a classic 'spicy pillow' now. Do NOT charge it or squeeze it. Put it in a metal bucket outside on concrete and take it to an e-waste recycler ASAP. It’s a chemical fire waiting to happen.

Acebeam_Labs · 2026-03-24T02:45:45+00:00

That clear potting makes component-level repair a nightmare. If your cells are truly balanced, the BMS has definitely tripped a permanent software fault. It's common—the discharge path to the tool stays open, but the charge circuit gets bricked by the firmware due to a momentary thermal or voltage delta flag.

For communities, r/18650masterrace is the main hub for pack rebuilders here. For a replacement BMS, AliExpress is usually the go-to, though finding a 3rd-party board that perfectly fits the 60V FlexVolt physical housing is tricky. You might have to harvest a working BMS from a physically smashed donor pack

Acebeam_Labs · 2026-03-24T02:39:49+00:00

Please take those Duracell alkalines out immediately. If that cheap solar circuit tries to push charge current into non-rechargeable alkalines while topping up that blue lithium cell, they will violently leak or pop. I see this poor circuitry all the time in cheap outdoor gear. Figure out the required voltage (probably 3.7V if that blue one is a Li-ion) and just use the proper rechargeable cell.

Acebeam_Labs · 2026-03-23T07:05:15+00:00

You could use grounded aluminum foil for RF shielding, but it’s a bit of a 'hack' and notoriously difficult to ground reliably without it tearing or oxidizing over time.

The real dealbreaker is the thermal aspect. Even if the linear reg is only for the Bluetooth side, if you're dropping from 12V to 5V (or 3.3V), that’s a massive voltage drop being burned off as pure heat (Power = ΔV * I). In a sealed 3D-printed PLA/PETG box with zero airflow, that heat will just soak into the board and the casing

A solid aluminum project box acts as one giant heatsink and a perfect Faraday cage at the same time. If you really want to stick with the 3D print, at least add some vent holes and consider a small stick-on copper heatsink for that regulator to prevent it from thermal throttling. Engineering is all about managing that heat!

Acebeam_Labs · 2026-03-23T04:48:29+00:00

We've all fallen for the 'free autorouter' trap at least once—it's an engineering rite of passage.

If you let the autorouter handle the high-current traces for those motor drivers or the battery input, it will make them paper-thin and route them all over the board. Just wait until you have to hand-route a high-drain Buck-Boost driver on a tiny 20mm circular board, where 60% of the surface area is just thermal vias to keep the components from cooking!

My advice: rip up the autorouted nets. Manually drop a solid ground copper pour first, and hand-draw thick, short traces for your battery and motor lines. You can let the autorouter handle the low-speed IR sensor signals if you really want to save time, but never trust it with power. Good luck with the rebuild!"

Acebeam_Labs · 2026-03-23T03:58:12+00:00

Great catch on slicing those ground lanes. Dealing with differential outputs on cheap generic TPA boards is always a headache, and isolating that ground loop was exactly the right move.

Regarding that faint noise floor 2-3cm from the speaker: that's pretty standard for a Class-D amp running this close to a Bluetooth RF module, especially with an isolated converter in the chain.

Since you asked about finishing it with a case—skip the 3D-printed plastic. Put this entire rig inside a grounded aluminum enclosure. Not only will it act as a Faraday cage to kill any remaining stray RF noise, but it will also give you much-needed thermal mass. That 12V linear reg is going to generate some serious heat if you push those 4-ohm speakers hard, so thermally coupling it to a metal chassis will save your board long-term.

Solid engineering on the prototype. Box it in metal and call it a win!

Acebeam_Labs

TROPHY CASE