Tag: pcb

The PCB (Christmas) Tree (#P32)

Epiphany has already passed and St. Knut’s day is next Wednesday, it’s about time to stop being lazy and get the Christmas tree out of the living room.
Well, yes, but not the usual way. As shown previously, it’s not an ordinary tree. It’s green and it has fancy little lights all around, but it’s also containing significant amounts of lead and it needs a PoE port to operate.

Meet the PCB Tree.

Made from scrap circuit boards, random bits of wire, leaded solder and a couple of Chinese ingredients, it’s a wonderful Christmas abomination that sat the entire last year in my office and received a significant addition in early December 2020. […]


First Sunday in Advent & the PCB Tree (#E16)

Well, looks like it’s the first Sunday in Advent already and I’m too lazy preparing a new post. I’ve been working a bit more than usual lately due to our products likely playing a role in the whole temperature controlled Covid vaccine logistics thing. On the remaining Sundays I’ve been extending my old PCB Christmas tree. It’s been using diffused slow RGB (self) fading LEDs ever since (“100pcs LED Diod 5mm RGB Blink Slow Flash Diffused Light Emitting Diode Rainbow 2Pins Lamp Red Green Blue RGB Flashing 5mm LED”, around 2€ per pack of 100) and quite a few of old PCBs now, some bare and scrapped before assembly, some from tests or failed revisions, and some from defective commercial products like routers, access points, projectors, SAS backplanes, RAM, IoT gateways, hard disks, you name it. […]


Post #100 HP 6644A refurbishment (#P14)

Not that anybody cares, but this is actually post number 100 already. I prepared something else that failed (to be reported!), so this one has to do instead ;)

My “lab” power supply situation is ageing and often no longer up to the task, think of LEDs north of 35V or anything that takes more than one amp at voltages that cannot be provided with common computer supplies (3.3V, 5V, 12V, 19/20V) easily. So this is part one of the refresh.

I bought a HP 6644A power supply around six weeks ago off eBay, at 245€ including shipping and rack mounts via best offer. […]


ESP8266-DHT22-SR501 kitchen lights thingamabob PCB (#P7F1)

Alright, software aside, back to hardware…

The ESP module shown in #P7 slowly gathers dust in my kitchen, which is tolerable for a few weeks, but that’s not the solution I want long-term. Also, it’s on a separate power brick, meaning there are two microcontrollers running in my kitchen for doing fancy light switches and some air quality logging for twice the standby current. Nope, has to go, needs to be consolidated into one unit.

So a while back I designed this PCB and ordered it (once again) at OSH Park, together with some teeny-tiny DIP adapters that cost next to nothing. […]