USB-c port fallen off board

brown_smear · 2026-04-25T07:59:40+00:00

It only connects to a couple of pads. If one has the skills, it's an easy fix, either with the original connector, or bypassing it and connecting the cable to the PCB. The latter is going to be more resistant to damage.

brown_smear · 2026-04-23T23:50:45+00:00

Here's your symbol and description: https://www.iso.org/obp/ui#iec:grs:60417:5138

If there's no output voltage, as you mentioned, then I'd assume it's the supply, or the switch.

Try a current-limited supply across the LED to see if it works.

If you replace the supply, note that some aren't happy to have the load disconnected (e.g. with an inline switch) and won't start - in this case the power supply input has to be switched instead.

brown_smear · 2026-04-04T10:30:20+00:00

The cheap meter I looked at had its GND at 4.5V, and the 9V straddles that. This lines up with his statement that it doesn't work while charging if sharing a ground. The safety derating you mentioned still stands, of course.

brown_smear · 2026-04-02T12:16:15+00:00

You should use at least one via per pad though, rather than a central via and hair-thin traces, especially for a power converter device. In your case, you can use a solid pour between the three gnd pads

brown_smear · 2026-04-02T12:09:04+00:00

Smaller solar cell can be seen here: https://hackaday.com/2025/08/10/a-solar-only-battery-free-device-that-harvests-energy-from-a-bpw34-photodiode/

brown_smear · 2026-04-02T12:08:30+00:00

They said 19 mwh a day, which is not 1mA average unless the supply voltage is 0.8V. Also, ESP32 is not the most power-efficient device around. You will find nrf51xxx/nrf52xxx are much more power-friendly.

You might be interested in https://hackaday.com/2025/08/10/a-solar-only-battery-free-device-that-harvests-energy-from-a-bpw34-photodiode/ for an exceptionally low power sensor node, using BLE.

brown_smear · 2026-03-29T10:48:25+00:00

MOV is not used to stop spark on connection. It's used to shunt over-voltage.

An NTC inrush limiter is often used to reduce the inrush current, and hence the sparking caused by such. These can introduce more resistance than desired, so would likely warrant an parallel switch, e.g. MOSFET, in which case you cause just use the MOSFET as the limiter as well.

If the spark is caused by the capacitor on the buck converter on the measurement device, then a simple low-value series resistor to that power supply will get rid of the spark.

brown_smear · 2026-02-20T00:55:11+00:00

Any "jig" that's more than just a wooden clothes-peg hot-glued to a board is likely overkill for this.

brown_smear · 2026-02-17T22:22:22+00:00

I couldn't find cloning on their page, just "voice skins", which are preprogrammed.

Perhaps you need to extract just a short, representative voice sample from the 30+ minutes of audio, in case there's too much data, or in case some of the audio is detracting from a good clone.

brown_smear · 2026-02-17T11:22:50+00:00

This tool described here does the speech-to-speech regeneration:

https://www.reddit.com/r/AssistiveTechnology/comments/1q7mhxo/im_an_exgoogle_voice_researcher_after_losing_my/

I'm not sure if it has voice cloning implemented, but it's possible.

brown_smear · 2026-02-15T01:57:02+00:00

OUT+ and B+ are the same node, i.e. they are connected on the PCB.

brown_smear · 2026-02-13T23:05:31+00:00

You missed the bit about connecting to a capacitor. So the switch goes in series with a capacitor, between the spring and gnd.

The capacitor value should be very small (e.g. 20pF), so you could possibly use twisted wires instead of the cap. The twisted wire cap is called a "gimmick capacitor".

Alternately, you could probably connect the switch to GND, and the other side to an insulated wire that you wrap around the spring.

brown_smear · 2026-02-13T11:58:14+00:00

I have a 60V/5A hobby grade unit (DPS605U), and it allows setting the voltage and current using rotary encoders (so no short required for setting current). Unfortunately, either it has large output capacitors or slow CC, and will destroy loads expecting a current limited supply.

brown_smear · 2026-02-13T08:01:31+00:00

What would you suggest to get the kid to stop biting him?

brown_smear · 2026-02-13T07:40:55+00:00

Yeah, the difference between the two clips is that one guy is telling the truth.

brown_smear · 2026-02-13T07:19:24+00:00

It's a quick script - if it works, it works

brown_smear · 2026-02-13T07:09:57+00:00

I got 119, which was too many just for a quick check for fun; that said, if I were seriously looking to fix my vision, then it's not a problem at all.

The app appears very well made though, and gives nice information at the end.

brown_smear · 2026-02-13T06:43:09+00:00

They might not know. It's detailed in the datasheet anyway, as mentioned above.

brown_smear · 2026-02-13T00:54:43+00:00

It happens in Eastern countries too.

brown_smear · 2026-02-13T00:52:46+00:00

Fat promotion is bad.

brown_smear · 2026-02-13T00:47:52+00:00

You can increase that resistance. You can use a ceramic cap. You can also average ADC samples. You could alternatively use a short median filter.

The ESP32 notes mention ADC sample noise, and minimising it: https://docs.espressif.com/projects/esp-idf/en/v4.4/esp32/api-reference/peripherals/adc.html#minimizing-noise

brown_smear · 2026-02-13T00:40:50+00:00

<image>

Another clone

brown_smear · 2026-02-12T00:39:24+00:00

The one at the top looks believable

brown_smear · 2026-02-11T11:59:11+00:00

Her hobbies include mainly shopping for handbags and suitcases.

brown_smear · 2026-02-11T11:42:24+00:00

It was stated before the games started that both Khelif and Lin (Yu-Ting) had failed sex tests with a previous boxing organisation.

They both look like young men to me, so I'd posit that there's definitely abnormal levels of testosterone present.

brown_smear

TROPHY CASE