All Questions
90
questions
0
votes
2
answers
45
views
KY038 sound sensor: Voltage to SPL
I'm writing code to measure frequencies with a KY038 microphone sound sensor. It uses an LM393 voltage comparator.
How do I convert voltage to sound pressure level (SPL)?
0
votes
1
answer
58
views
Intentionally cutting off an audio signal at high volume
TL;DR: I am looking for a the best way to amplify all external sound but cut off at a hearing safe level.
I am attempting to incorporate active ear protection into an old SPH-4 helicopter helmet. I ...
- 3
0
votes
0
answers
335
views
Difference between speaker and subwoofer voice coil
What is the difference between speaker, woofer, and subwoofer voice coils?
- 1
0
votes
0
answers
174
views
TPA3112D1 PCB design no output sound
I'm still learning about electronics and wanted to make a simple 25W class D audio amplifier circuit as a hobby project. The circuit I made is inspired by the TPA3112D1 Evaluation Module. The ...
- 1
0
votes
1
answer
152
views
LM748 uses positive rail as an input on a 1980's UK sound effect generator. Is this an old trick that I've never seen?
TP9 is a +/-15V signal from a VCO.
The signal to the base of Q7 is 0 - 10V from another card that is presumed to be basically DC.
The multiplier AR11 has a sound coming from an LFSR circuit on another ...
- 11
0
votes
1
answer
602
views
Envelope detector for audio compressor
I found the envelope detection part of an analog audio dynamic range compression circuit here, and I'm trying to figure out the purpose of:
The second series diode
The 100k feedback path from the 2nd ...
- 1,341
0
votes
0
answers
87
views
Customising audio on an arcade game with U6295 audio IC
I have an arcade redemption game that has a U6295 audio IC that plays 4 different soundtracks which are stored on a ST M27C801 EPROM.
I would like to flash my own audio onto that EPROM with one of ...
- 167
0
votes
1
answer
226
views
Proper audio amplifier for a 12W-RMS / 60W maximum speaker
I have two different amplifiers TDA2030A ~ 18W amplifier and a TPA3118 ~ 60W and a medium size speaker labeled 12 watt RMS - 60 watt maximum.
I don't know how the RMS wattage is so far different from ...
- 117
0
votes
1
answer
197
views
How do I calculate the coarse tune and fine tune register values of AY-3-8910 for a desired frequency?
I have hooked up an AY-3-8910 sound chip to an Arduino Nano and I am trying to get it to give me a square wave at a frequency of 440Hz on channel A. The datasheet for the AY-3-8910 says that the ...
- 121
3
votes
1
answer
353
views
Why is my 5 pin switching headphone jack shorting out my circuit when I plug a 3.5mm phono cable into it?
I have an STX-3790-5N 3.5mm stereo switching headphone jack in my circuit.
http://www.kycon.com/Pub_Eng_Draw/STX-3790-5N.pdf
The intention is for the audio signal to flow from the ATmega328 pin 9 to ...
3
votes
1
answer
2k
views
Why does volume above 80% break my speaker (PAM8403, 3w 4ohm, 18650)?
I am new to working with electronics and I am building a simple speaker.
The Problem
The speaker I built so far (poor sound quality aside) stops working if the volume is above ~80%. By stop working I ...
- 133
0
votes
0
answers
296
views
Playback volume from old Sony voice micro cassette recorder is very low
I have an old Sony V.O.R M-529V microcassette recorder. It was found in a box packed away years ago.
I put in some fresh batteries and tried to play some old micro cassettes I had, but the play back ...
- 1,524
-6
votes
2
answers
227
views
Computer Speakers vs. Human Voice [closed]
How do computer speakers compare to the human voice in regards to the range of frequencies they can produce?
What is the lowest a human voice can go (either world record or just the average person) ...
- 89
1
vote
1
answer
98
views
Audio Circuit Playback
I have an audio circuit setup currently in which a microcontroller (PIC32MM) sends PWM signals to an amplifier which is attached to some speakers in order to hear what is going on.
I have attached a ...
- 19
0
votes
0
answers
531
views
Use stereo DAC for mono application
I am developing an audio device that will have a mono audio output. I currently use the PCM5102A stereo DAC in my prototype as it is easy to find as a separate module. But it does have a stereo output,...
- 155