Printing a Flexible PCB LED Roulette with Silver Ink on PET | LED Applications, Flex Circuits

Описание: In this video, we guide you through how we printed a three-layer flexible circuit on heat-stabilized PET and validated the design of an LED roulette board that resists flexing with components populated.

About the LED roulette
The circuit functions like a roulette wheel: each time the pulse generator is triggered, the LEDs on the roulette PCB light up in a rapid circular sequence before slowing down and stopping on a single LED.

The design consists of a 555 pulse generator and a multilayer flexible circuit for the LED roulette, developed by ITIZ, Voltera’s partner in Korea. We modified their original rigid PCB design to a flexible version printed on coated PET.

We divided the design into three layers:
Bottom conductive layer: Printed with ACI Materials’ FS0142 Semi-Sintering Conductive Ink
Dielectric layer: Printed with ACI Materials’ SI3104 Stretchable Printed Silver Insulator
Top conductive layer: Printed with ACI Materials’ FS0142 Semi-Sintering Conductive Ink
By printing a dielectric layer and a crossover layer on top of the bottom conductive layer, we were able to create a compact and lightweight roulette without using jumpers.

About flexible PCBs
Flexible printed circuit boards (FPCBs) include single- or double-sided PCBs, multilayer PCBs, and rigid-flex PCBs. They are bendable circuits made from flexible materials like polyimide. FPCBs are commonly used in industries such as consumer electronics, automotive systems, medical devices, and aerospace because they fit into compact or curved spaces.

Lightweight, adaptable designs are crucial for the development of flexible electronics. Using direct ink writing (DIW) machines, flexible PCBs can be printed by depositing conductive inks onto flexible substrates, enabling efficient and customizable production.

0:00 - Intro
0:17 - Printing layer one: semi-sintering conductive ink
0:42 - Printing layer two: stretchable printed insulator ink
0:56 - Printing the crossovers: semi-sintering conductive ink
1:11 - Dispensing solder paste: T4 solder paste
1:16 - Populating with components
1:31 - Reflow
1:45 - Applying UV curable resin: Siraya Tech Tenacious
2:01 - Assembly and testing

ACI Materials Semi-Sintering Conductive Ink FS0142: https://www.acimaterials.com/product/...
ACI Materials Stretchable Printed Insulator Ink SI3104: https://www.acimaterials.com/si3104/
Voltera T4 Solder Paste: https://store.voltera.io/products/sol...
Siraya Tech Tenacious Flexible Resin: https://siraya.tech/products/tenaciou...
Normandy Coating

About Voltera
Voltera was founded in 2013 with the goal to create an affordable and easy-to-use device for prototyping PCBs. As a result, the V-One desktop PCB printer was launched in 2015, followed by the NOVA dispensing system in 2022. With thousands of customers across the world, Voltera is on a mission to make electronics prototyping more accessible by removing the barriers to entry in the printed electronics industry.

Voltera’s products — V-One and NOVA — operate using direct-ink-writing (DIW) technology, an extrusion based additive manufacturing process that deposits conductive inks, solder pastes, and other functional materials onto substrates layer by layer. This technology offers precise control over material deposition and is ideal for prototyping and customizing several design iterations each day.

If you work in flexible hybrid electronics (FHE), or take interest in FHE applications like this, Book a meeting with us today to talk about your academic research or product prototyping needs! Additionally, we offer a printing service where we handle your prototyping needs for you, with no minimum order quantity required. Just tell us about your design and we will get back to you.

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