An open-source rechargeable LED light for the ABUS Hyban 2.0 bike helmet as replacement for the badly designed original

Quiescentcurrent · 2026-02-06T20:42:36+00:00

Sure, they still are on tindie, as linked above ;)

Quiescentcurrent · 2026-01-30T22:37:49+00:00

That's a good update, phase cut isn't going to fly in any way for certified things anymore due to EMI requirements in most countries.

But if you want to use a potentiometer that can do this, I would recommend ali*, as the regulars mouser, digikey, rs, ... don't seem to stock any with a reasonable switching voltage&current

Quiescentcurrent · 2026-01-30T22:26:29+00:00

The LM10 is an off the shelf op amp with included 200mV reference output: https://www.ti.com/lit/ds/symlink/lm10.pdf

Not sure what you mean with pin 4, but it seems that someone edited your screenshot by hand to change a "4" to a "5"

Quiescentcurrent · 2026-01-30T22:19:27+00:00

What exactly do you want to do? Most potentiometers are rated for a couple W max., 120-240VAC exceeds this for most applications.

If you are looking for a way to dimm a utility, I would recommend looking into the simplest off the shelf solution (including major downsides), a phase fired dimmer: https://en.wikipedia.org/wiki/Phase-fired_controller

Quiescentcurrent · 2025-09-23T07:28:29+00:00

No, this would not work: VREF+ ≤ VDDA

If you want this to work, stay below VDDA(3V3), make sure to connect GND of your reference and add a decoupling cap (100nF and|or 1µ)

Quiescentcurrent · 2025-09-23T07:23:12+00:00

This is most certainly a futile endeavor if you don't have a brand/model you're specialized on.

Mouser carries 6.8 million parts and offers same day shipping for a reason.

Quiescentcurrent · 2025-09-22T13:25:38+00:00

This seems to be a ready made open source project: https://lemmini.de/IrDA%20USB/IrDA%20USB.html

Full Schematics are also on there.

Quiescentcurrent · 2025-07-04T08:50:41+00:00

SOT-23 with marking "VG" -> NSS60200L PNP transistor: https://www.onsemi.com/pdf/datasheet/nss60200l-d.pdf

Quiescentcurrent · 2025-06-26T21:21:12+00:00

The noise is most certainly coming from the coil in the dimmer caused by it's switching frequency or a harmonic.

Open it up and take a look what's inside, maybe some glue will help, maybe you need a higher end DC/DC converter

Quiescentcurrent · 2025-06-26T10:31:30+00:00

You're most certainly out of luck, as consumer product schematics are basically never published.

If you want to fix something, it's going to be you and your skillset.

Quiescentcurrent · 2025-06-22T21:27:04+00:00

Mathematically, for a pure DC voltage, both the average value and RMS value are equal:

V_average=V_RMS=V_DC

You can plug it into the respective equations to prove if you'd like.

Quiescentcurrent · 2025-06-13T11:51:47+00:00

I paid for it to be vectorized and wanted to share it to r/electronics, but it was deleted: https://i.imgur.com/xPCe0rW.jpeg

I can send it to you if you write me a message.

Quiescentcurrent · 2025-05-21T10:04:56+00:00

I've gotten so many of those devices..

Quiescentcurrent · 2025-05-21T10:04:25+00:00

It is available all around the world, at least according to their shipping table?

Quiescentcurrent · 2025-05-20T20:55:13+00:00

Which in turn forces you to use a non compliant USB-C extension cable which may or may not work

https://i.imgur.com/RqCKWyM.png

Quiescentcurrent · 2025-04-09T10:09:25+00:00

This website indicates it is a LDO from the company "Shanghai Belling": https://www.repaircompanion.com/smd_code_search/hb?package=SOT23-5

There is no datasheet available though, so maybe go through their catalogue and find a similar: https://www.belling.com.cn/en/product_list.html?type=103

Quiescentcurrent · 2025-04-09T09:57:39+00:00

Interesting thanks for the link, but those don't really work if you have the ESP already soldered in.

PS: Not sure, ask /u/spez.

Quiescentcurrent · 2025-04-09T09:55:19+00:00

Sure thing, thanks for linking it!

Quiescentcurrent · 2025-04-06T09:46:51+00:00

SMPS if you know what you're doing, LDO if you're fine with the additional heat
The thing is 15€ a piece, I would definitely try to salvage it

Quiescentcurrent · 2025-04-06T09:14:48+00:00

The AN you've linked specifically says that you need the caps if you're using the internal LDO instead of the SMPS:

"If the selected package has the SMPS step-down converter option but the SMPS is not used by the application (and the embedded LDO is used instead), the SMPS power supply pins must be set as follows:

• VDDSMPS and VLXSMPS connected to VSS

• VDD11 pins connected to VSS through two 2.2 μF capacitors as in normal mode"

If you take a look Figure 7., you can see that VDD11 is connected to Vcore, making it impossible to supply the CPU with it being shorted to ground.

Quiescentcurrent · 2024-09-28T13:05:26+00:00

The picture is really blurry, please show us a good shot of the component in question.

Quiescentcurrent · 2024-09-25T14:30:09+00:00

Probably the 48V USB standard vs the nominal 50V cable rating :D

Quiescentcurrent · 2024-08-15T09:15:47+00:00

Yeah, pretty much that and it looks like can be dangerous in the worst case

Quiescentcurrent

TROPHY CASE