circuit board

  1. G

    Light flashing unit for car

    Hi there The photos attached are of a board that is used for creating an effect with vehicle back lights (for instance flashing rear brake lights and rear indicators independently every half second to create an effect.) My project is recreate this for two new units, but as a complete and utter...
  2. boromyr

    Problem with guitar amplifier: distortions in the higher notes.

    Hello, I am building an amplifier for an electric guitar, and I am encountering an annoying issue when playing the higher frets of all 6 strings of the guitar (Stratocaster) with more force: when playing a string after fret ~19 with greater intensity, the sound distorts, as if it were an...
  3. ali.malik

    Identify this IC od suggest me a similar one with the same pinouts.

    can you please identify this IC because there is nothing written on it or you can suggest me a substitute with the same pinouts. This circuit board is used in 8 program flashing led lights adapters.
  4. crylord37

    Toy Drone controller repairment

    hi everyone, I am trying to repair my drone controller. One of the component is broken and fell. I think its a crystal oscillator. Its 6mm x 1.5mm. I dont know how much mhz it is. Is there a way to know how much it is at home. I wil attach some images of it and where it belong. Even if you guess...
  5. K


    I have been trying to use the USB2244 on a board but i can't seem to get it working and I am not sure what the problem is. I have went over and over the datasheet but can't seem to figure out what i'm missing . I have attached my schematics, I have verified i have 3.3V, and also that the 1.8...
  6. alexbez


    Hey guys, I am trying to diagnose what the issue is with my Kurzweil CUP2 digital Piano The piano displays no sign of life besides a red on led. LCD screen does not display anything Buttons do not seem to do anything(there is a little red light above each button that indicates the "mode" it is...
  7. alexbez

    Relay bypass help needed!

    Hey guys, I am relatively new to micro electronics, and am in desperate need of help! I want to bypass the muting circuit in a electronic piano. This involves either activating the relay, or pulling it to ground (BA3-5 Relay, and the highlighted LS1 in the picture below). Please could someone...
  8. S

    Hardware Design Competition (Robotics) ends May 28th

    Greetings humanoids! There’s no doubt that robots are here; we are seeing them more often in the home, in the sky, or working on the farm! And we know firsthand that many engineers fell in love with hardware or coding by attempting to build their first robot. We’re excited to launch our...
  9. BrokenBones108

    Broken guitar pedal project (Bitsbox muff)

    Hello, About a year ago I bought a Muff Guitar pedal project from Bitsbox. It was working well untill it broke last week. I took it apart and noticed the ground wire coming from the output has been pulled out of the board (the output became lose and must have spun enough to pull this off). Now...
  10. Gina2209710134

    Cat toy circuit board confusion and button dilemmas

    Hi everyone, I’m very new here and I’m currently working on a very small project that seemd as if it would be simple at first but is proving to be harder than expected with little to no tech knowledge as of yet. It’s a project for my cat & new kittens. They have a laser cat toy that turns on...
  11. B

    How do I make an Equipment ground

    I am building the Elenco AM/FM radio kit. And for a static power test it is telling me to connect my equipment ground to circuit ground test point 15 while the circuit is being powered by a 9volt battery. . I’m just pretty confused on what it means by “equipment ground” and what I can do to...
  12. BigOak14

    Cassette recorder microphone modifications

    Hi there everybody I have a new portable cassette recorder, but it has a terrible internal microphone, I was wondering if there was any way to unsolder the microphone and attach the aux cable of a lavlier microphone for better audio quality?
  13. G

    ECG ON TEENSY | Needed help in circuit diagram?

    Hi, I was working on a thesis project on a portable ECG device, I checked these CIRCUIT: VIDEO...
  14. 2

    How to get data from a circuit board with a microcontroller?

    Hi, I'm a complete novice in field of electrical circuits and have zero knowledge in this domain. Yet, I wanted to work on IOT but instead of using raspberry pi and similar, I wanted some data out of few devices. For example, I have a very old traditional treadmill which reflects the speed at...
  15. N

    Advice on Connections

    With a hobby build I have an issue and was wondering if anyone has any ideas? Basically I have a 12v plasma tube light with two female spade connectors, the circuit board I am attaching it to has a two pin JST slot. The circuit board has timed light and sound functions. So was curious if...
  16. 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...
  17. 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...
  18. Lambo Av

    Doubts on How Connector Works

    Hi all, I am currently reviewing this Degson DG2002-4.0 connector. May I know what does the arrow above the connector mean? And what do the holes beside the arrow does? Based on the photo below, there is this operating tool which can be...
  19. H

    LM7171 Non Inverting Amp Output Glitching

    Dear Team, I am designing a clock distribution network using LM7171. This opamp is used in the non-inverting configuration with a gain of 2. My input clock frequency is 2.4Mhz, Amplitude is 3.6V.I can see glitching at the output. May I know where I went wrong?Please find the circuit diagram...