Questions tagged [audio]
Questions about designing electronics for measuring, processing, and amplifying audio signals.
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Mains hum in TDA7265-based active loudspeaker
The old pair of M-Audio Studiophile AV40 active speakers (one box containing all the amplifier parts and the second is just a passive box) I have have developed a clear low-frequency hum. This hum is ...
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Best practices for combining dual mono to stereo? [closed]
I have two old-style telephone pickup coils, each of which has a 3.5mm mono (TS) male output. I made a simple adapter that just runs together the grounds from both inputs and connects each positive to ...
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Audio amplifier cutting off and clicking PAM8304
I have designed a PCB with a PAM8304 Mono Class D Audio Amplifier and MAX1708 5v step converter to drive a 4 ohm speaker. The device will be battery powered with 3.3v battery hence the step up ...
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Synchronizing multiple I2S codecs on stm32f405
I am designing an audio device that requires two CODECs to be connected to the MCU - two stereo outputs, two stereo inputs. When working with a single codec, no problems with synchronization occur ...
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what is the source of this noise when recording to raspberry pi using USB soundcard
I connect aux out from my laptop to USB soundcard mic in and use arecord to record audio. But I am getting noise even recording at CD quality. The nature of the noise is really strange as it seems to ...
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Can the impedance of the source affect the response of a high-pass filter?
Having a simple RC high-pass filter, can a high signal impedance change the cutoff frequency response? Or more practically, should a resistor before the capacitor be included in the calculation for ...
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Audio visualizer: What can I improve in this circuit?
Being a beginner in electronics, I embarked on designing and building a sound visualizer, turning bass, mid, and high frequencies into red, green, and blue light in an RGB LED strip.
I designed the ...
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Noise in audio amplifiers when touching the smartphone touchscreen as an audio source
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, ...
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How do you diagnose a fault with a tweeter?
I have a Pioneer XPRS 10 at work that isn't producing any high frequencies; the 10" woofer working fine, but the 1.75" tweeter is not producing any sound at all. It's a 50W, 8 ohm tweeter. I ...
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PAM8403 weird clicking / banging noise
I'm using an ESP32, a PCM5102, and a PAM8403 to output a 3.5mm Audio Jack output.
In my circuit, I'm sending the Audio Signal via I2S to the PCM5102, where a quieter output can be picked up. If the ...
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Why is there a greater lag in Bluetooth headphones compared to wired?
The Usual Answers and Responses:
Encoding, Compression, and Buffering
The typical answer to this on the internet is because Bluetooth headphones require the conversion of one form of data information ...
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What is the purpose of these fat copper coils wrapped around … something?
Dissecting 20-year-old outdoor speakers (SpeakerCraft OE8 One), found this electronics board inside. I recognize the capacitors, but what are the big custom coils of copper wire, and what is their ...
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Radio mic and speaker as camera mic input
I want to add radio comms to in car action camera audio. I am a total amateur in analog circuits. I understand that i can't just feed headphone out and mic into camera. That will trip PTT (Push-to-...
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Why can I hear a radio station when probing with oscilloscope? [duplicate]
I assembled this on a breadboard:
and am hearing a faint buzzing sound...
My first question is, what could be causing this sound? It does not go away if I connect VIN to ground. With or without VIN ...
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CB style PTT Mics to USB circuit
I need to design a circuit that takes the input from 2 different CB style (4-pin) push-to-talk microphones and pipes them out to USB. CB mics I have confirmed use regular XLR balanced level output. ...
