1. 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...
  2. 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...
  3. S

    oscilloscoper analysis from my final project (about guitar pedal effects)

    im doing a final project about making a guitar pedal effect, and my lecturer ask me to compare it to commercial guitar pedal using an oscilloscope. i made 4 effect, reverb, echo, chorus, overdrive, all of this effect showing almost same result as the commercial effects, but the reverb one doesnt...
  4. E

    Trying to design an audio circuit with a carbon single button microphone so that I can output the audio into a PC

    So I recently purchased a 285W western electric transmitter as I'm trying to more or less make a microphone that can plug into a computer which uses a carbon button microphone from the early 20th century. I have little education in circuit design, though I know enough to know I probably made...
  5. M

    Designing communication device

    Hi. At first I want to appologize for my English, it isn't my native language, so sorry for any grammatical errors. So, here is problem that I'm struggling with for a while (2-3 months). My friend goes to shoot various events and actions, he ussualy has 5-6 cameras with 3-4 cameramem, but...
  6. Rahulk70

    Playback volume from old Sony voice micro cassette recorder is very low?

    Hello folks, I have an old Sony V.O.R M-529V microcassette recorder. Was found in a box packed away years ago and put in some fresh batteries and tried to play some old micro cassettes I had. But the play back volume from the recorder even at full volume from the speaker was almost in audible...
  7. Azusau

    Audio noise with MIC

    hi, I had try to use LM358 and TDA2822 to finish a audio circuit that shown as below. Now, here is a trouble that a lot of noise when I using MIC input audio signal, but it looks normal work when I using my cellphone input audio signal. there are two videos show the two condition. Audio signal...
  8. N

    Subwoofer led light bulb

    Hey first time posting here i have a pair of samsung ps-hs 7000 subwoofer from a mx-hs 7000. The stereo receiver fell off the speakers and cant be repaired. Ive been using the speakers/sub with a different stereo but The subs have a massive light bulb/led thing in the middle of them and i was...
  9. M

    Problem integrating a TL072 audio mixer circuit on stripboard

    Hey! So I've been trying to build a modular synth on/off for the last year or so, and one of the most simple projects I thought I should start with is a mixer circuit. I found a really simple circuit schematic and shortly after got it working on breadboard, with absolutely no problem at all...
  10. V

    Change frequency of PCB

    Hi, I have some speakers I love, they have a PCB RF reciever inside. I bought more speakers but they are a different frequency.. I'd like to change them so they all match but have no idea what I am doing. Can you help?
  11. A

    Modding wireless RF headphones to Bluetooth headphones

    Hi guys, I have been using a pair of Sennheiser headphones for quite some time now (HDR 118). They offer good sound and sit comfortably, however they do work based on RF signals (863 - 865 MHz) and have been catching a lot of interference as of late. Instead of just getting a new pair of...
  12. Just Bucket

    High quality audio recording with MCU

    Hi everyone. I am something like a musician, but I also like to experiment with electronics a lot. I own a BOSS looper pedal, but it kinda doesn't fit my needs as well as I firstly thought. Recent days I was thinking abou whether is possible to somehow utilize some sort of MCU or just some ARM...
  13. Z

    Motorcycle bluetooth speaker

    Hi there, I want to build a bluetooth stereo speaker set for my yamaha xvs 650a. So due to me never having built something like this before, I have some questions. Buyable speaker sets claim to have either 600W or 1000W amps, and I've found this 2x500W amp board on amazon and was wondering if...
  14. A

    Noob Question - Simple volume control for PC and PAM8610 amp

    Hello everyone! First of all, if you're beginning to read this, please understand that I am very new to electronics, I have little studies but I can at least not produce cold solder...most of the time. I also can't use the standard drawing softwares yet, as my knowledge is far from this (The...
  15. S

    lm386/why this circuit works well with my iphone audio jack but when i connect a mic it makes so much hiss and noise

    as you can see this is the circuit that I made based on lm386N-1 whenever I connect my iPhone (it's a 5s if it makes any difference ) the sounds works great and clean only when I put it to max it has some distortions but when I connect the electret microphone it makes a lot of noise and hissing...
  16. M

    Replacing potentiometers on vintage record player - PLEASE HELP.

    I'm trying to replace the poteniometers 1no Volume and 1no Tone on a 1970s Sonorama M390 vintage record player. Im struggling to find the right components, or even where to start with this. (few images included below) Volume: 1M Ohms B (as printed on the component), I'm unsure what Wattage...
  17. C

    Using audio LC filter circuits instead of RC.

    I'm designing a small mixer and stopped at the equalizer section when I recalled the number of small inductors (axial and SMD) in my parts kit. If you search 'filter circuits' or similar you'll ALWAYS get the standard RC topologies, and I'm thinking more of IC feedback types than the usual...
  18. Oroku saki

    Help needed with electronics side of design

    Hi there, I am currently working on a project that requires a waterproof subwoofer speaker (8 ohm) be hooked up to either a sine wave generator or a laptop/computer of some sort, this is because I want to be able to play frequencies and generate tones such as resonants and sweeps etc. So I’m...
  19. P

    TI TPA2008D2 audio amp woes

    Hello everyone, I'm in the middle of making an audio hat for my Pi and I'm looking to see if anyone has worked with these TPA2008D2 chips before. It seemed like a nice and simple class D amp to run on 5V that didn't need much power or many extra components. I also wanted something that I...
  20. E

    Audio Preamp Circuit for a Microcontroller

    I made a pre-amp audio circuit but it doesn't seem to work. I want to amplify an audio signal so that it has a DC offset of 1.8V. I tried to simulate a similar circuit in KiCad and the simulation seems to work ok. Below is the circuit I designed and assembled. On the scope, the voltage is as...
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