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Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.


  1. R

    Active monitor - power up but no sound during a few minutes

    Hello all, I have a problem with one of my active studio monitors. I have them for many years, and it has this problem for a long time, but it's getting worse now. So, specially during winter and colder times, when I power it up, after being off for at least some hours, the power light lights...
  2. Califauna

    Connecting charger cable causes Sony WH-10000MX2 bluetooth headphones to stop working

    Hi, I have a pair of WH-10000MX2 bluetooth headphones with a strange problem. Connecting the charging cable causes the headphones to no longer turn on when pressing the power button. I thought I had 'fixed' this when I took them apart and disconnected the battery for 15 minutes and found as...
  3. D

    Bluetooth integrated FM transmitter project

    For semester project, I am planning to choose this topic. The audio is first received using the bluetooth module, do the necessary processing and transmit that signal through certain frequency using frequency modulation. The main thing is that I want to do it but don't know how to do it. Is it...
  4. H

    Hobby audio player project noise problem

    Hi everyone, I'm new in here. I designed a controller card project and the card can switch some devices with relays, dfplayer mini to play sounds from sdcard, external bluetooth music player card is connected to the circuit. cd4066 used for audio switching between dfplayer and Bluetooth audio...
  5. G

    Impedence mismatch problem in audio project

    I'm working on a project which involves some old conference interpreter consoles from around 2008. They were designed to work with seperate distributor boxes into which you plug a floor signal from the venue PA system and it passes that to all the consoles. In return, the consoles pass their...
  6. A


    Hello Dear Friends, I need to know dos and do not about my idea. My knowledge with electronics is near Zero but I am doing at DIY projects. I have a software that generates healing frequencies from 20Hz to 20Khz out of my audio interface, now I need to connect the output signal to tens...
  7. O

    Archt One Speaker(discontinued)

    Hello all I have been attempting a repair on a Archt one speaker for about a month now and I just can’t figure it out. I’ve probed around, I’ve tested the speakers in a home theater just to make sure they work and they do just fine, but when put together I get no sound through BT or through Aux...
  8. T

    Building a simple oscillator

    Hi, hopefully this is the right place to post this question. I’m looking to build an oscillator. I have all the parts ready to order and I wanted to double check that I’m not making an obvious mistake. I’m completely new to this and I thought it would be worth a second opinion to know if the...
  9. T

    How do I get rid of static noise?

    Hello I've made an audio mixer (with only one input just so I can test if it works) and it does work but I'm hearing a static noise that I can't get rid of. Here are some photos Any help will be highly appreciated
  10. misterT

    Audio measurements automated (Sone unit of loudness)

    Strange problem for me.. new territory. I appreciate every opinion and experience you have to offer on this topic. I need to record a button click. This is for user-experience thing. I have Babyface Pro FS and a very good and expensive microphone. What are my options to automate this thing with...
  11. Califauna

    Boom box modification

    Hi, I have a W-King D8 Bluetooth boom box which I'd like to modify with some external speaker output jacks and some buttons to switch the internal speakers on and off. From factory the specs of the boom box are: -Power Input: DC 5V -Speaker Output Power: 2 x 25W ( confirmed by Youtube channel...
  12. B

    Help building a voice-recording circuit with Nuvoton ISD1730

    Hi all! Thanks for creating this amazing online community. I'm currently working on building the "Example #1" circuit listed on page 19 of 26 in the datasheet for the Nuvoton ISD1730PY chip (image attached). I've attempted to translate the schematic into a breadboarded circuit, which I've...
  13. Califauna

    Midi controller / DAC interface not recognised (Device descriptor request failed).

    I have an EKS XP10 midi controller with a Burr Brown DAC. When plugging in the controller it isn't being recognised by Windows. I have two more of the same controllers. Only this one has this problem. I have checked and confirm there is steady 5v across legs 1 and 4 of USB socket on the...
  14. C

    Audio bridge between two phones

    Hello everyone. My scenario is the following: I have two phones let's name them P1 and P2. I need to get the sound from P1 Out and redirect it in P2 In (Mic). I also need to do the same thing but reversed, to get the sound from P2 Out and redirect it in P1 In (Mic). So basically when P1 will...
  15. P

    LTSPICE opamp circuit sim

    I'm trying to sim the input circuit of an audio EQ, but I'm getting only DC at the output. This is what I'm trying to simulate: It's the input section of this schematic: Here's what I've created, the .ASC is attached: I'm using an LT1057 model as it is described as a drop-in...
  16. T

    does anyone else think this could be a million dollar idea?

    I have some bluetooth earbuds and I want to make it usable with an aux cord like bluetooth headphones. I could just directly connect a 3.5mm port but then the current would also travel into all of the other parts. Would that be a problem? If so couldn't I just use diodes to prevent this?
  17. N

    Circuit bricks Nano (power supply)

    Hi, I am making a module for a DIY modular synthesizer. The module applies an ADSR-envelope to an audio signal using a 10K MPC41010 digital potentiometer. I suspect, I made an error in the circuit, since I now have 2 Nano's which will not power on from USB (pwr led flashes a few times and then...
  18. J

    Sampling ultrasonic signals

    Hi, I want to sample 4 audio sources which frequencies would be between 30 kHz and 40kHz (ultrasonic signals). Is there a microcontroller with ADC that could do that?
  19. sr13579

    What is the pinouts for this module?

    I specially need those 4 pins togather on one aide of this module.
  20. sr13579

    JDY-62 Datasheet required!

    Hello Friends! Can you help me with the pinouts of this bluetooth audio receiver module?
  21. sr13579

    How to add Next and Previous Button with Android's headset/earphones?

    I tried to figure out how to add different functionality with headset controller. So far I found how to make signals for volume up and down and play/pause. Now I want to add two switch which can do the next and previous operations. How am I supposed to do that?
  22. ElectroMaster

    FM Transmitter (#1)

    This circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless microphones. If powered by a 9 volt battery and used with an antenna no longer than 12 inches, the transmitter will be within the FCC...
  23. sr13579

    What is the name of this IC used in bluetooth audio receiver and FM radio?

    I bought tgis cheap bluetooth receiver that has a chip #AC1805E88767 or something like that with symbol of PI(3.1416) on it? I tried to search about this IC but nothing comes up. I tried to take a photo but the chip is very small. Does any of you know about this chip?
  24. M

    One speaker is picking up radio module noise

    I currently made a module to my project which isn't quite functioning correctly. It's 4 distinct parts on one board. The radio I/O, the two independent sound amplifiers out of the LM386's and the RFID card reader. This is the circuit: The actual inverter IC I used is 74HCT04 because it...
  25. Holes Flow

    Reduce Audio Sampling Bandwidth for FHT/FFT

    Experts, I am looking for a way to use the standard arduino FFT (no FHT for non-AVR) but only for a small section of the audio spectrum. Instead of breaking down the entire spectrum, resulting in wide bins even after /2, I'd like to only sample 2 or 3kHz of the spectrum, and thereby have a more...

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