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Questions tagged [audio]

Questions about designing electronics for measuring, processing, and amplifying audio signals.

2
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0answers
52 views

Why is 3.5 mm audio jack so long (about 19 mm)?

The designers of 3.5 mm audio jack made the decision to keep it's length long (about 19 mm). They could have easily gone shorter lengths. Does longer length provide some noticeable improvements? From ...
2
votes
0answers
34 views

How to improve this microphone phantom power supply to have better SNR?

I built this power supply for my Schoeps CMT30F vintage microphones: It works, but it's not the best I can expect in terms of SNR. What would do you to ensure the SNR is the best possible? Use 0,1% ...
-1
votes
1answer
25 views

3.5mm, 4 conductor, in-line, plug

I am struggling to find pictures of the plug I bought to figure out where to connect speaker wire to. It is a TRRS 3.5mm plug ...
1
vote
2answers
55 views

Creating a vibration device based on bass in audio

First, I'll admit that I haven't done any real electrical engineering in years so I'm quite rusty. But here's a fun project to contemplate: I'm building a device that "rumbles" with the bass in the ...
1
vote
1answer
75 views

Fast attack, slow release envelope detector

EE novice here. I want an envelope follower for a +/- 1V audio signal which immediately (i.e. within a couple of milliseconds, ideally) increases to the amplitude of the input signal, then falls off ...
2
votes
1answer
63 views

Can I test a XLR microphone with a DMM?

I have a microphone with a XLR output and a XLR to PL cable. I don't get from it any signal on my PC. Can I test with a DMM the microphone and the cable in order to locate the problem?
0
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0answers
46 views

Audio Processing using raspberry pi [on hold]

i want to use the RPI to process the incoming data from five crystal microphones in order to obtain the direction of arrival of sound so that i can steer a camera mounted on two servos to that ...
0
votes
1answer
59 views

Need help extracting line out signal from car radio

I'm trying to extract audio signal from my car stereo and use it as an input to my external amp. The place I want to get it from is marked in red in this picture: I used the IC31-34 pin12 to get the ...
4
votes
1answer
184 views

Undescriptive capacitor and inductor values in audio-amp datasheet

I was learning about audio amplifiers and came across the STA516B IC. To my surprise, the example circuits feature some values for capacitors and inductors which seem a bit high for me. So I wanted to ...
1
vote
2answers
60 views

Convert CMOS-level signal to microphone-level (0..3V --> -1..+1V)?

I'm building a microcontroller circuit that feeds its output into a microphone input of an audio recorder. The output is a square wave. (Think old-style 3.5mm Square credit card readers). What can I ...
0
votes
2answers
55 views

Using a microphone as a loudspeaker [closed]

Can I get an audible sound wave if I drive a microphone with an electrical signal with the frequency lying in the audible range? The vice-versa case is possible, although, loudspeakers are not very ...
2
votes
3answers
51 views

How to wire headphone switch correctly in audio amp (LM4875) circuit?

I'm working on a circuit for a small audio device and I'm a bit confused about the headphone jack wiring, I hope someone can shed me some light. I'm using the LM4875 because I have a speaker and a ...
-1
votes
0answers
30 views

audio quality and safety devices of a passive audio mixer

This is my first question here on stack exchange. I have searched a lot for this question but could not really find the answer precisely. At the moment i want to make a simple audio summer, using an ...
3
votes
1answer
67 views

Loudspeaker volume issue

I am building a microcontroller based circuit that generates some sound out of a loudspeaker. Basic problem: Not enough volume out of loudspeaker Strange stuff: Volume is louder if I use a LM386 ...
2
votes
1answer
41 views

Adding a volume control for headphones, driven by microcontroller

I'm currently driving a pair of earbuds with this circuit: P0 is directly connected to a 3.3V microcontroller pin, which is using PWM to drive it. I "stole" this filter circuit from the upper left ...
0
votes
0answers
73 views

Digital Potentiometer behaves completely differently from the original analog one

I have a guitar pedal which basically is an analog echo/delay audio effect (MXR Carbon Copy). The circuit diagram is presented below. It has 50K B analog potentiometer that controls the delay time. ...
1
vote
0answers
35 views

Amplitude Modulating a simple Laser using an RF transformer

I know I can modulate a laser using an audio transformer see pic and website below. Pen Laser website I was wondering if it’s possible to modulate a simple pen laser using RF signals in the RF range ...
0
votes
0answers
46 views

8 channel audio ADC to deal with live sounds [closed]

i want to construct a digital audio mixer capable of receiving 8 audio channels and output the combined audio signals in real time. How can i process 8 live audio channels at the same time with ...
0
votes
0answers
56 views

Balanced speaker level to unbalanced line level

I am attempting to take a balanced audio signal at speaker level (~10V peak to peak) and connect it to an unbalanced 3.5mm jack at line level. I found this schematic which suggests using a transformer ...
0
votes
3answers
138 views

Why do tube amplifiers have such (relatively) small reservior capacitors?

In learning about guitar amps, I've been studying the schematics for solid state and tube amplifiers, and I found a pattern that I've never seen an explanation for. If you consider any of the main ...
0
votes
1answer
41 views

Using a line filter transformer for audio? [closed]

I've read that line filter transformers (like the one on the image) attenuate EMI between AC mains and an electronic circuit. Will the RF attenuation also work if I used one of these on audio input ...
1
vote
1answer
66 views

Would an audio signal be degraded by adding a 0.45 ohm resistor?

I have a pair of expensive in-ear monitors (earbuds). Each side utilizes six balanced-armature drivers and a passive crossover. The right side is quieter than the left side. The headphone wires are ...
4
votes
2answers
156 views

Which is broken, the amp or the driver of this subwoofer?

My subwoofer (with an internal amp) is showing difficulty reproducing low frequency sounds (sine 30Hz ~ 70Hz). As I lower the frequency, around 70Hz, I start hearing very slight distortion (hint of ...
0
votes
1answer
34 views

How to calculate gain of opamp with Max446 chip?

I just wondering how do you calculate the gain of the amplifier in a circuit like this: I am familiar with gain calculation on non-inverting and inverting opamp but am having trouble with this. Any ...
0
votes
3answers
70 views

AC coupling capacitor in the ground to break the ground loop?

I'm implementing the following audio single-ended to differential converter for an ADC: This is the reference design for the PCM1804 that I intend to use. What would happen if I do this: Would it ...
1
vote
1answer
45 views

How can i replace a electret mic input with headphone output as input

I'm using a SIM800L GSM module for my project. In this module there is a electret mic input pin but I want to give audio to this module from headphone output from a mobile (There is no line in pin ...
0
votes
1answer
57 views

What's this amplifier filter configuration?

I've come across an audio amplifier circuit that contains this following configuration: I recognize R1,C1, and R3 to be part of a first order high pass filter, but I'm not sure what C2 and R2 are for....
0
votes
1answer
47 views

Options for 2 or 3 band active audio tone control circuits with quite steep frequency response

I'm trying to roughly replicate the sound of the per-stereo-channel 3 band equaliser conttols of an old Citronic Pro-8 / Pro-10 DJ mixer. If I'm correct had a fairly steep curve so bass and treble ...
2
votes
3answers
535 views

Mathematically derived waveform vs. captured waveform from an analog synthesizer

I was thinking about how the individual parameters on an analog synthesizer could be controlled digitally. What I mean is, instead of using mechanical potentiometers to adjust some quality of the ...
0
votes
0answers
33 views

Subwoofer passive crossovers in series

I have a passive crossover between my amp and subwoofer. However too much high frequency is coming through, I'd like it more subby. If I were to add another passive crossover, so the wires going to ...
1
vote
1answer
32 views

Filtering Audio Signals in MATLAB

I'm trying to apply a filter to an audio signal in MATLAB and having some trouble processing it. So far, I have a transfer function that describes a K-weighted filter, and I am able to create a bode ...
4
votes
5answers
1k views

Running baseband analog audio signal over cat 5 cable [closed]

What will happen to a single ended (not differential) 1Vpp analog audio signal(4khz bandwidth, not modulated) if it runs through long cat5 cable (length can be 50 meters)? How much signal voltage can ...
1
vote
0answers
32 views

How to create a Bluetooth audio streamer that receives and transmits at the same time?

I want to create a Bluetooth streamer that wirelessly receives audio from a Bluetooth audio player (like smartphone) and then transmits the received audio to a Bluetooth speaker, with no wired ...
1
vote
1answer
57 views

Opamp Design for Low Impedance Sources?

I am terribly confused ... I tried myself at building a low impedance guitar pickup some time ago. Quick LowZ Pickup Intro Basically just two loops of aluminium with two magnets, a humbucking guitar ...
1
vote
0answers
30 views

Dolby HX PRO implementation on existing tape recording deck

I'm experimenting the implementation of Dolby HX PRO's IC into an old stereo Fostex tape deck to improve high frequency and headroom capabilities. HX PRO works as a dynamic processor with the BIAS ...
0
votes
1answer
48 views

Ohm's Law in Practise

When the AUX pin of a stereo is connected to my mobile phone's audio female port, I just measured the voltage at the end of this AUX pin(No load is connected) approximately 2mV using a DMM . But when ...
-1
votes
1answer
92 views

Transmitting audio signal over long wire [closed]

If audio signal needs to be transmitted over long wire say 50 meter length (and needs to be heard through a speaker at other end), what parameters needs to be taken care of? If we send signal over ...
0
votes
1answer
105 views

Supply an analog circuit with digital control

Tell me please how best to power the circuit which has an analog part and the part which, with the aid of arduino and digital potentiometers, controls the analog part. The supply voltage V(in) of the ...
0
votes
1answer
25 views

Multiple MCP41010 Digital Potentiometers Work From One CS Signal

tell me please, for example, I control for example any parameter of the sound path of the guitar pedal with the help of MCP41010 and I need to make a dual potentiometer of two single-channel chips for ...
0
votes
3answers
45 views

Voltage increase on regulator load

I have a simple adjustable power supply (1.8V - 16V / <1A) that I put together with an LM350, works great for the various small bench-top things I use it for. Typically on a load being applied, I ...
0
votes
0answers
54 views

Audio power amplifier circuit explaination

This circuit: My goal is to modify this circuit to operate in DC mode. Got this circuit on the web, but there is some part of it that I still don't get how it operates. T4/T5 is an adjustable ...
1
vote
0answers
69 views

Audio DC Offset

I want to make an audio processing device using a Teensy and I want to run an analog signal into it. My background is in audio programming, so electronic circuits are new to me. I realise audio is an ...
1
vote
0answers
68 views

Can this circuit be simplified?

The circuit is a LPF with a buffer stage in front of it that uses a linear pot. to control gain & attenuation. The setup is such that the response of the linear pot. is similar to a log. pot.. A ...
0
votes
1answer
65 views

Reduce clicks when switching over cd4066

I make an audio switch on the chip cd4066 (I control using arduino), please tell me how to make a smoother switch without sharp clicks, I need the sound to appear with a small attack and just fade out,...
0
votes
1answer
57 views

Sound Chip Audio Amplification Circuit YM2612 + TDA1308

I've been working on a project for connecting a Yamaha YM2612 to an arduino and triggering sounds to be played from the chip. I'm having trouble on the audio part of the circuit. I've worked out a ...
0
votes
1answer
36 views

Line out cannot drive audio isolator [closed]

I have a cheap Bluetooth/FM radio module connected to a TDA7942. Unfortunately it passes all kinds of disturbances it picks up from the power supply to its line out. I thought to connect an audio ...
0
votes
1answer
31 views

Hexabitz Module H07R4 (Audio Module) heating up

I am using Hexabitz's Audio Module H07R. The schematics of the module can be found over here. The module uses a audio amplifier (TS4990IST) and STM32F0 MCU. I ...
0
votes
1answer
71 views

Audio amplifier alignment procedure questions

I have a couple of questions related to the alignment procedure for the amplifier of Klipsch SW-12, a powered subwoofer. Its service manual (link below) says the following: (page 3) COMPRESSION ...
0
votes
0answers
43 views

How to connect mic&speaker signals on different platforms?

I posted a question about carrying a line signal over 10-meter cable to transmit and receive human voice from a handset in a building to a GSM/GPRS modem (Quectel M95F). The main goal is to do a GSM ...
2
votes
2answers
91 views

Using audio instrument cable for 1MHz transmission

I'd like to transmit digital data together with an audio signal along an instrument cable. In more detail, I'd like to send MIDI data and the audio signal of a guitar on a single cable. The rationale ...