1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. Marcel DaJanchar

    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...
  12. 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.
  13. M

    Bluetooth module BM83, connect to DSP

    Hi! I have a circuit consisting of audio input from a microphone, which then gets amplified. This is then sent to a ADAU1467 dsp. Now I would like to add a bluetooth module BM83 to the circuit but I'm new to all of this and don't really know how to connect the module to my circuit. The thing...
  14. 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?
  15. Stas06

    DIY Microphone - THAT1510 or THAT 1512

    Dear all, As a reference to the context why I'm asking this question: I'm looking for the THAT1512 but it's hard to find and often the 20€ delivery is quite expensive for a 5€ part. Moreover, the THAT1512 seems to be out of stock in a lot of places until June 2022. I'm looking for an...
  16. D

    Circuit to alert to loitering vehicles by detecting engine idling for more than 2 minutes

    Hi Guys, I'm new here, so apologize if this has already been covered. I would like to know when a vehicle that stops at the stop sign in front of my house just hangs out there for an extended period of time. I'm imagining a circuit with a ceramic mic, audio level detector that triggers a WiFi...
  17. Circuit_closed

    Halloween coffin

    I'd like to make a coffin for next halloween that rattles and has audio play when anyone walks past it. I've got ptc circuit for audio and I have an idea about using a cam and motor for the rattling door but is there a way I can get the audio circuit to work with the motor controls? I was...
  18. L

    Balanced Audio Preamp Circuit

    I tried to make a preamp circuit but I'm not getting any output at all. The simulation on LTSpice seems to work well. The Op Amp I'm using is LMV821 datasheet I'm using a balanced dynamic microphone Zener Diode is 5V1. I don't mind if its noisy as long as I get a some sort of amplification from...
  19. C

    Parallel Inverting Summing Amplifiers

    Hello Everyone, To add on to my newbness from yesterday, I have one other part of my design that I am not sure what's going on. I have some suspicions but thought you guys probably could spot it pretty quickly or at least probe at me to look at it differently. I have again attached a setup...
  20. C

    Microphone Filtering and Blocking

    Hello Everyone, I have a quick question about my audio section I am working on with a microphone. I have attached a screenshot of my setup. I am debugging the circuit in a couple of different areas and keep running across the same issue and I am not sure why....granted I am new at this stuff...