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Reddit:Electronics

My first PCB, robot wiring
![]() | submitted by /u/Hapiel [link] [comments] |
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 :) [link] [comments] |
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. [link] [comments] |
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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. [link] [comments] |
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. [link] [comments] |
Found my old SP0256-017 speech generator (Radio Shack part number 276-1783)
![]() | submitted by /u/botman [link] [comments] |
Could anyone help identify this part and/or give a link to the product?
![]() | submitted by /u/sheepicus02 [link] [comments] |
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! [link] [comments] |
Shouts out to my man voltage divider
![]() | submitted by /u/Januwary9 [link] [comments] |
50 year old DRAM still works fine
![]() | submitted by /u/forgreathonor [link] [comments] |
🙌
![]() | submitted by /u/thatsmyusersname [link] [comments] |
Wireless mouse using Air Power (NO BATTERY)
![]() | submitted by /u/Due-Coach-2992 [link] [comments] |
Laser Projection Microscope Build (Details in Comments)
![]() | submitted by /u/c0mput3rn3rd [link] [comments] |
RCA photomultiplier
![]() | submitted by /u/1Davide [link] [comments] |
LM317 CIA-203 adjustable voltage stabilizer really fun soldering practice
![]() | submitted by /u/suckatgrammer [link] [comments] |
Crimping ain't easy
![]() | Spotted this monstrosity in the wild [link] [comments] |
Early 1970s high quality rotary switch kit from Siemens
![]() | submitted by /u/forgreathonor [link] [comments] |
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 [link] [comments] |
Fire tablet repair
![]() | submitted by /u/rainbowunicornjake [link] [comments] |