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I've been kindly sent an xmas decoration by PCBWay. It's a RGB strobing PCB in the shape of a tree, powered by a CR2032 and using copper layers for the tinsel.
The design, by Salvatore Raccardi, uses RGB auto-flashing LEDs which don't require current-limiting resistors.
They are, however, very bright and do drain the CR2032 very quickly, so I wondered if hacking in a series resistor would improve things.
This did seem to help with the brightness, but I noticed few blue and green flashes with an 820 Ohm resistor in line. Dropping this helped, but perhaps there's an internal resistance to each of these with which we're now creating a voltage divider and possibly messing up the forward voltage for the Blue and Green LEDs?
See what you think.
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Hackster project description: www.hackster.io/SalvatoreRacc...
PCBWay ordering page: www.pcbway.com/project/gifts_...
My PCBWay projects page: www.pcbway.com/project/member...
GadetUK164's channel where you won't find soldering like this: / @consolerepairs
0:00 Introduction
1:27 PCBWay!
2:17 Inspecting the board and its circuit
8:11 Calculating the battery life
12:48 Cutting the track & adding a resistor
16:40 Testing at 820 Ohms
18:16 Coda: revision to 330 Ohms
22 июл 2024
