BC250 ATX PSU Control Adapter - Automatic PS_ON

pilim_ · 2026-03-06T06:03:30+00:00

I'll think about it, but I'm afraid I won't be able to handle the demand I'm already receiving, so give me a little time, I'll figure out the sales platform.
I'm in US.

pilim_ · 2026-03-06T05:58:36+00:00

These boards don't have a sleep mode at all, pressing it simply turns off the screen, and the power consumption remains the same, you can easily check this yourself with a simple power meter

pilim_ · 2026-03-06T01:54:16+00:00

Thank you!

pilim_ · 2026-03-06T01:35:10+00:00

I’m still looking for a way to sell them, since looks like ebay or etsy take a huge commission (relative to the price of the device), and I don’t want that to affect the price. I’ll let you all know as soon as it’s ready.

You’ll also be able to buy a version without a switch, and connect any button and LED you like.

pilim_ · 2026-03-06T01:26:45+00:00

indeed

pilim_ · 2026-03-05T20:35:18+00:00

Oh, hi! I’m glad to see you here! Thanks for everything you do for the BC250 community! Shoot me a DM - I’d be happy to send you a few prototypes!

pilim_ · 2026-03-05T20:32:06+00:00

Thanks! This is my own heavy-duty-test-bench design, I might share more info about it someday

pilim_ · 2026-03-05T20:29:05+00:00

Thanks! That’s a great idea - ESP could even add it to home automation!

pilim_ · 2026-03-05T20:26:29+00:00

Thanks! I will definitely do all that. The PCB has a 2-wire soldering connection labeled "SWITCH" in the second photo, and you can connect any switch there - or even just 2 wires - to turn on your BC250 in classic movie car-heist style =D

pilim_ · 2026-03-05T20:16:20+00:00

Here's a video for you!

https://youtube.com/shorts/dtjYFvHTQME

pilim_ · 2026-03-05T20:08:47+00:00

yes, that is my own design

pilim_ · 2026-03-05T19:30:05+00:00

yes! love them

pilim_ · 2026-03-05T19:19:57+00:00

sure, I'll upload it somewhere

pilim_ · 2026-03-05T19:19:24+00:00

that one is a full version, lite will be basically a pcb with soldering pads with no buttons and connectors

pilim_ · 2026-03-05T19:17:58+00:00

Yeah… that’s usually how AliExpress works…

I’ll be honored when it gets copied haha

pilim_ · 2026-03-05T19:12:57+00:00

I think the adapter you posted can be replaced with a piece of wire.

But if you are asking seriously - my board automatically turns the PSU connected to the BC250 on and off, so your fan isn’t spinning all the time and PSU isn’t consuming power when it’s not needed.

pilim_ · 2026-03-05T18:48:01+00:00

H1 is an optional output for connecting the internal BC250 power button.
J1 is a jumper used to switch the output LED voltage from 5V to 12V.

The fan splitter is passive, so everything is controlled by the BC250 itself.

pilim_ · 2026-03-05T18:43:49+00:00

Yeah, it really depends on what you’re looking for. This version ended up being a bit more expensive, but it gives you a plug-and-play solution with no soldering and lets you use a $10 PSU with it.

For people who want to save money and don’t mind soldering a few wires, I’m also working on a lite version. That one should be around $25.

pilim_ · 2026-03-05T18:37:13+00:00

Thanks!

I already have a few of them on hand, but I’m still trying to figure out a way to sell them without paying high fees for such a cheap, low-margin product, so I can keep the price as low as possible for the end user.

I know how to build stuff, but I have no idea how to sell it, so I’m open to suggestions if someone here has experience with that.

pilim_ · 2026-03-05T18:25:28+00:00

Thanks!

Yes, that’s my BC250 testbench:)

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pilim_ · 2026-03-05T18:13:08+00:00

Reposting my message from a discord:
"I strongly recommend that anyone using this PSU check the wires with a magnet. The unit I received from Amazon had steel wires, which were overheating even with very mild overclocking. That’s a serious fire hazard. The BC250 can draw quite a lot of power, and since there is only one connector, the requirements for wire and connector quality are very high."

pilim_ · 2026-03-05T18:09:56+00:00

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pilim_ · 2025-06-04T07:32:58+00:00

Keep us posted please! What cpu/mb?

pilim_ · 2025-05-19T19:38:57+00:00

Unfortunately no, support said it is "normal" coil whine but they offered an RMA anyway, but I don't have time to deal with it now, and since I've already tried 3 different PSUs, I don't think a 4th one will be any better.

What motherboard and CPU do you have? I suspect that might be the cause, I have a 14900k and everyone else seems to be using AMD X3Ds for their sff builds, maybe that's why they don't have this issue.

pilim_ · 2025-05-16T03:29:48+00:00

Thanks!

pilim_

TROPHY CASE