1. boromyr

    Audio noise when touching the touchscreen

    While observing the audio output of my smartphone on the oscilloscope, I noticed a signal being generated when I touch the touchscreen. This signal is around 500Hz and appears in groups of 3 peaks, with intensity proportional to the skin/touchscreen contact area: The output is from an AUX cable...
  2. S

    Analog Switch Audio Switching Circuit.

    Hi All, Can anyone assist with helping me design a circuit to switch between 2 audio signals using a DG419? I’ve never designed a circuit before and am only attempting now as there isn’t any pre-made electric boards breaking out this chip into an easy to use plug and play form. The power...
  3. Chrissalberts

    Audio split pcb design

    Hi there! I have designed a pcb for a passive audio split but I'm wondering if this will work out or if it will give issues. Gerber file is included. I would solder an XLR connector to the pcb, and it'd split to two patch points right besides the connector going through over inner layer copper...
  4. WillK

    Audio RMS to drive Linear solenoid

    First time posting - Hope I'm in the right place of this fantastic website. I am trying to develop a system where the louder ambient noise is received from a microphone, the more 'extended' a gear rack will be for an art installation. I have experience working with digital audio and have...
  5. 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...
  6. M

    Question on how to improve my analog audio amplifier circuit

    Hello everyone! My original intention was to sample analog audio via the analog pin of the Arduino Uno Microcontroller. For testing purposes I used my phone as the audio source and plugged in a 3.5mm AUX cable I extracted from some old phone headphones. Then I used the R speaker audio wire to...
  7. M

    Using a 12V DC trigger from Audio Processor to operate relay for power amps

    Hi, I'm using a 12V DC /240V AC relay to power on my audio amplifier when the main Processor comes out of standby (it has a 12V trigger out that goes high). Amplifier is a Crown XLS 2502 XLS 2502 | Crown Audio - Professional Power Amplifiers Crown XLS2502 Stereo Amplifier Review | Audio...
  8. Moebius

    I need help with a very specific audio design

    Hello everyone, I’m new here. Sorry for my English, I’m from South America. I need help to solve a very specific audio system. The system needs to solve 3 issues for a duo of djs who wear helmets. The issue number 1 is they need to communicate between them and with an external guy. The issue...
  9. vifyrv

    How do I reverse a pushbutton logic with a switch?

    What is the simplest way to reverse the logic of a switch? What I have are audio levels running to a jack or speakers. I figured out how to simply add a Sanwa arcade button to interrupt the flow when it is not pressed and simply complete the circuit when it is pressed. The question: is there a...
  10. Ladraz

    A weird problem (Audio + Power)

    The problem: I have 3 Adams A5X studio monitors and 1 z5500 system. Let us call the Monitors A, B and C. Sometime last year (2022) Monitor (A) started to randomly cut in and out, the power button is ON however, the sound cuts off and then, at random times turns back on again (If no sound is...
  11. R

    DTMF IC identification and pinout

    Hello:) I'm working on this old touch-tone telephone (Statesman 9040R - see picture). I'm essentially building a new circuit from scratch - it won't be connected to the phone lines but will instead be an arduino based interactive playback circuit. I would still like to understand how the old...
  12. R

    Looking for DTMF generator dedicated IC

    Hi all, I'm currently reworking an old touch-tone telephone, which involves redesigning the circuit to avoid the whole telephone line high voltage AC circuitry etc. In my first prototype I got on fine using an IK semiconductor 91214b IC to do DTMF generation, with the keypad keys connected as...
  13. 1

    DIY Microphone suggestions

    So I recently saw a video from DYI perks and he uses a "TSB-2555B Electret Capsule" and a "THAT1510". However, building my own pre-amp seems like a daunting task and I don't have the budget to buy a kit from somewhere like mic parts. So if anyone has suggestions as to a simplified pre-amp or a...
  14. Monty Cash

    Zoom Livetrak 12 faders not working properly after transport

    So I have pulled apart my Zoom livetrak 12 channel mixer recording unit and found nothing superficially wrong with it. It was damaged somehow in transport and now the last fader on the right doesn't work at all.. however the second last fader somehow operates both itself and the last fader and...
  15. Khisraw

    Audio Processing with Rsp4

    Hi, I am working on an audio processing project using Rsp4. It involves using two mics both connected via USB ports. The program works however there is far too much noise that you can barely hear. It mic2 it like a machine is ON. I am new to audio processing so I assume I need to do some...
  16. D

    Guitar signal blender/mixer - best practice advice needed

    Hello! I am making a guitar pedal which will allow me to blend a clean guitar signal with a distorted/dirty signal from some other pedal. This is the circuit I came up with: CIRCUIT DESCRIPTION: The pedal has 4 signal connectors: IN - inbound clean signal from guitar SEND - outbound...
  17. Khisraw

    Audio detection with Raspberry Pi4

    Hi All, I am working on a project to detect sound from a mic and process that sound in Raspberry Pi4B. The Mic(Link below) has a digital putout. https://www.sunrom.com/p/sound-sensor-module-mic The Raspberry Pi4B doesn't have an ADC so, in theory, the Mic module should be ideal. The question...
  18. RagTMS

    THAT1512 alternative for DIY Microphone project

    Dear all, This is a repost since the original post (https://forum.allaboutcircuits.com/threads/that1512-alternative-for-diy-microphone-project.188951/#post-1760251) was in the wrong section This is the project I am trying to recreate I'm looking for a way to make the preamp created in this...
  19. M

    Transferring audio by I2S

    Hello! My plan is to create a circuit, which would effectively transfer 6 channels of analog 16-bit audio signal to the other side without loosing quality or inducing some kind of interference. Cable length would be around 5 meters. This circuit would be used in automotive to substitute 6 RCA...
  20. K

    Amplifier 50 Hz hum

    I'm trying to detect the source of the problem and hope you can help me to where should i look for it. So when I'm raising the volume on the amplifier the hum gets more quiet then if its 0 volume.(Without any input, just the speaker connected) It's not ground loop probably. Already checked.
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