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Discussion and news about component-level electronic circuits.Electronic systems and circuits
Updated: 37 min 5 sec ago

Best way to replace this battery with 18650/21700

Sun, 09/24/2023 - 02:07
Best way to replace this battery with 18650/21700

Recently my £350 Bluetooth dongle had it stupid micro usb connector snap off.

I have a 3D printer so I’m going to print a new case to contain one or two 18650 or 21700 batteries. I’ve found a PCB on Amazon that takes a USB-C connection and charges 18650/21700. I know the basics of electronics but wanted to double check before I blow up this £350 dongle

Since the battery on it is a 3.7v and 18650/21700 are 3.7v too, can I just go from my 18650 bms to the connector where the old battery is directly? Or will I fry something?

I’m worried that it could get fried when charging, I can’t find any specs for the battery it currently has. I won’t be charging the new battery through the dongle as the USB connector has broken off. Instead of trying to fix the traces and add a new one, I want to 1. Replace the battery with something bigger, and 2. Have a way to charge this

Thanks for any help :)

submitted by /u/A_MrBenMitchell
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Made my first hand made PCB.

Sat, 09/23/2023 - 23:28
Made my first hand made PCB.

This is a capacitive touch sensing number pad for a lock. I've not yet tested it, but the touch sensor is self calibrating, so it should work. I have tested that the sensor works with a loop of wire through the plastic sheet.

I used a knife to cut out the traces and pads, but I used a printed template exported from Kicad, so I think I can still call it a "printed" circuit board.

I'm aware that trace 5 is broken and has to be repaired. I've also been made aware that lock numpads and computer numpads have the keys in different orders, and I used the wrong one.

submitted by /u/MikemkPK
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Weekly discussion, complaint, and rant thread

Sat, 09/23/2023 - 18:00

Open to anything, including discussions, complaints, and rants.

Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.

Reddit-wide rules do apply.

To see the newest posts, sort the comments by "new" (instead of "best" or "top").

submitted by /u/AutoModerator
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Mod I did to an old detector

Sat, 09/23/2023 - 03:20
Mod I did to an old detector

Took a broken CD V-700 apart and replaced the insides with a microcontroller and a new detector.

submitted by /u/FingerNailGunk
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Things you do when you forget to order 0R2 resistors 🙄

Fri, 09/22/2023 - 22:14
Things you do when you forget to order 0R2 resistors 🙄

Forgot to order 0R2 resistors in my BOM. Oh well, time for some good old fashioned botching to save the day.

submitted by /u/DolfinButcher
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Plug in resistor choice for KBMM 235

Thu, 09/21/2023 - 19:18
Plug in resistor choice for KBMM 235

Hi! I just bought a new old stock KBMM 225 driver, 18V obviously it came with the wrong plug in resistor and fuses so I need to source new ones, my motor is 520w at 180v and it seems I need a 0.35ohm one, I'm not sure about other paremeters though, can anyone help finding a suitable one from RS or Conrad or digikey? Thanks!

submitted by /u/PaulQuent
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Crimping ain't easy

Mon, 09/18/2023 - 02:23
Crimping ain't easy

Spotted this monstrosity in the wild

submitted by /u/TechRepSir
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Linear regulation circuit just for fun

Sun, 09/17/2023 - 19:19
Linear regulation circuit just for fun

It has no any practical purpose. However I think it got somewhat fancy so I post it.

So it has adjustable output voltage and overcurrent protection. The goal was to make something with minimal set of basic parts.

Simulation here https://tinyurl.com/ywqfok6x

Would be cool to hear any design suggestions, but again it is just for fun and probably won't be wired

submitted by /u/Right_Leg_9693
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