1. K

    Repairing Christmas/Fairy Lights

    I have a little experience with wiring after having to hot-wire my aftermarket radio in my car when changing it out, however I do not know how to fix this issue. The wires in the plug were loose and the lights were not turning on because of this, so i cut it off and figured it'd be as simple as...
  2. Remo0g

    Elaut eurograb rev2 motor control problem

    Hi, I bought a claw machine and there seems to be a problem with the motor control of the claw going up. when the claw is going up it will go for a brief period and then stop, the motor will stall and it throws an error (claw not going up) . Motor seems fine 28v 0.48a when powered with bench...
  3. BuyingOffDeath

    Unexplainable RF Power levels

    I have an RF Explorer to use to scan what RF's are around me. I am curious as I'm am just getting in learning about wireless transmission and propagation. However I can't explain these power levels of -10 dbm all the way to -0. The RF Explorer does seem to be working correctly just based off of...
  4. A

    Need Help for fixing/improving boost converter design

    I'm pretty newbie. i designed a boost converter as hobby and need some help about that. not sure if it will work. how can i fix or improve the circuit. i aimed 5 Vin and 15V 10A max out and use 555 for generate pwm signal for mosfets. But i know 555 can generate max %50 duty cycle and it means i...
  5. BerserkSin

    Help Needed- Digital Clock using ICs cd4060 and cd4026

    I found a blog that shows how to build a digital clock using ICs cd4060 and cd4026. https://danyk.cz/hodiny_en.html This is the site. I have checked if my ICs are working and they are. The only output I'm getting is the every 7 segment display shows 0 and the the two decimal points blink every...
  6. K

    Clock edge detector using capacitor and resistor problem

    I have watched recently this video: At the end of it he describe a way to make edge detector by using capacitor and resistor. The thing is i don't see it being discharged in any way. Would't it make it impossible to charge again and in consequence make current flow through the resistor and make...
  7. justaskingonce

    7447 does not show correct numbers on 7 segment dispaly

    Im trying to put a bcd input into a 7 segement display, but as it only shows the numbers 4 to 8 correctly, in all other numbers all of the segments are on, does anyone knows why? you can see the binary input on the right video...
  8. B

    Weird Oscilliscope Waveform on new device.

    Hello, I am new to building electrical devices, I am in the middle of building a power supply and found this as my output signal. Any Speculation would be appreciated. Thank you.
  9. lukewakeford

    Repairing an micro u.lf? connector on xbox controller motherboard

    So i pulled this antenna cable off a tad to willy nilly whilst disassembling to repair something else and it's broken the very tiny u.lf or similar connector. I know I shouldn't have, but here we are anyway, no way back now. It looks to me like the pads are still intact underneath half of...
  10. A

    Stumped on what to do on my digital clock project.

    Hey everyone, I recently enrolled in a computer science major, and one of the subjects has to do with circuits, memory, the cpu, logic gates etc. The problem is, I have absolutely 0 experience on such things, and now with covid and learning from home I haven't really grasped much of my...
  11. E

    I need help with coil gun circuit

    Hello, I have been making circuits as a hobby for 2 years now mainly focusing on trying to make a coil gun, and tried and failed 7 times now, and I am in desperate need of help with the circuit, if you see anything wrong with my diagram please respond as soon as possible. I bought most of the...
  12. D

    PCB, Tips and pointers if you've got a minute

    Hello everyone, I have taken a circuit from breadboard to PCB and I am having some issues with a few components. The device is a power controller designed to monitor 2 batteries. 1 battery is a backup battery and the other is the main battery. The main battery is also a starting battery for an...
  13. jmh474

    After some help , I was wondering if a game controller could be build using an arduino?

    Good morning all Iv had a bit of an idea and just wondering if there is anything out there or something similar as I'm not any good with coding. Iv build my son a basic gaming pc and he would like rgb but the mother board doesn't have a argb header, and I was wondering if a controller could...
  14. J

    Please somebody tell me what will be output watts of this PWM circuit

    Detailed description and website link are below. Parameter: 1>.Product Name: pWM 4-Wire Fan Temperature Controller 2>.Work Voltage: DC 11V~55V 3>.Work Current: 0.1A(MAX) 4>.Fan Current: 5A(MAX) 5>.PWM Range: 5%~100% or 0% 6>.PWM Frequency: 20KHz/2.5KHz 7>.PWM Signal Amplitude...
  15. JDuffy93

    Automatic adjustment of resistance

    Hi I have a design requirement and are having an issue of designing a method to achieve it I have resistive elements that change with temperature and generally start with slightly different resistances in any case, what i need to achieve is a way to balance the resistances or a method to...
  16. M

    Help with Rode Microphone Circuit Board

    I have an old Rode NT1 condenser Mic. I fixed it a couple of months ago by rewiring. I'm not good at soldering, but it worked. Then it fell from the mic stand and stopped working again. Upon inspection one of the wires had gotten loose from the circuit board. I rewired once more but have had no...
  17. IgnacioMorac

    Crowbar Circuit To protect Sensor for overvoltage

    Hello partners I come to you to help me determine what resistance values or what other components I need to be able to design a crowbar circuit that protects my sensor against overvoltages. My intention is to take care of my sensor for voltages above 40V. So I started to design this crowbar...
  18. Pashgen

    How to find a mistake. Sound amplifier circuit board. Need help with troubleshooting

    Hi, I bought DIY amplifier board. And now I am trying to find what I did wrong. It can work for about 2 seconds and then sound dissappear. But power stays on, and LED is glowing I connected 24 volt toroid to start the board. In description it says that circuit is designed for 12 to 36 AC...
  19. W

    Joule thief circuit issue

    Hey guys, So I am making a little joule thief robot looking thing with my son. I should have done a test circuit first but for some reason when I connect the battery I get a tiny little blink and that's it until I disconnect and reconnect then a little tiny blink again. Any ideas on what the...
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