Questions tagged [headphones]

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50 votes
4 answers
14k views

Loud pop noise while plugging to a headphones jack

I have a Panasonic RX-ES29 boombox with a type C plug (ungrounded). I sometimes hear a relatively loud snap/pop sound in the right speaker of my headphones while I completely plug them into the ...
Sepp A's user avatar
  • 563
30 votes
5 answers
13k views

I've become an electrical conductor for my headphones... but how?

So I have a pair of Bose noise-cancellation headphones that I plug into my keyboard every night to charge them (via my keyboard's USB port). My keyboard happens to be a metallic Apple keyboard. You ...
GDP2's user avatar
  • 417
11 votes
3 answers
6k views

Why aren't active headphones equalized to a flat frequency response?

Some headphones are 'active', with amplifiers built into the cups and requiring a power source (typically AAA batteries). I then see many audiophiles discussing frequency response as a metric of how ...
Ehryk's user avatar
  • 1,181
9 votes
3 answers
2k views

Can an electrolytic capacitor withstand 0.1 V reverse polarity?

Let’s start the question with a brief description of my application. I am trying to attach a headphone jack with a detect pin to a RDA5807 IC based FM radio project. I am using a separate ...
aditya444's user avatar
  • 173
7 votes
4 answers
3k views

How do high-impedance headphones work?

According to my probably antiquated knowledge I shouldn't be able to listen to anything if I plug my 300 Ω headphones (Sennheiser HD60) in my laptop or my phone, but it does play at a decent volume. ...
Artemix's user avatar
  • 247
5 votes
5 answers
9k views

Why place capacitors in front of the line to a (headphone) audio speaker?

I'm using this module based on the popular bluetooth module CSR8635 https://www.tinyosshop.com/index.php?route=product/product&product_id=875 I was wondering why, in the right-hand side of the ...
nick carraway's user avatar
5 votes
1 answer
25k views

Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?

I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy): I have an earphone splitter for iphones that has ...
K. Rmth's user avatar
  • 382
5 votes
3 answers
825 views

Low power tube headphone amplifier design

I have never worked or even listened to tubes/valves before, so its about time I did. I wanted a simple design to work with being my first tube project, and have found this from diyaudioprojects.com: ...
G Frank's user avatar
  • 167
4 votes
1 answer
586 views

How do I appropriately power a headphone amplifier and where do I place the volume regulating potentiometers?

At the moment I am building a device that splits an analog stereo audio signal into 3 signals and amplifies 2 signals for headphones. I need to know how to supply -12VDC and where to put the volume ...
d.oelert's user avatar
  • 319
4 votes
2 answers
1k views

How do I calculate sound pressure level (dB SPL) from headphones at a specific setting on my sound card?

I am using headphones with sensitivity 102 dB SPL / 1 Vrms with impedance of 300 ohms. For a particular volume knob setting on my sound card embedded with a headphone pre-amplifier, I would like to ...
Tanmayee Pathre's user avatar
4 votes
1 answer
189 views

How to properly couple DC in this biased headphone amplifier design on power-up?

I am a self-study noob to electronics (and audio electronics) but diligently learning every day :) Some things I understand well, others I'm fuzzy on. This device is a headphone amplifier using NE5532 ...
Gbps's user avatar
  • 143
3 votes
1 answer
939 views

Headphone output - what is the function of these resistors going to ground between the decoupling capacitors and headphones

The Korg Monotron Duo synth uses the TPA6111A2 headphone amp. The circuit they use is largely the same as the one from the datasheet - except for R78, the 470ohm resistor going to ground right after ...
Kenny Winker's user avatar
3 votes
2 answers
197 views

Audio: Resistance and power

I'm choosing between two USB DACs for a pair 32 Ω headphones and need to choose the one with the greater output, i.e. with the greater loudness. One DAC has a maximum power rating of 18 mW at 16 Ω and ...
sebinho's user avatar
  • 55
3 votes
2 answers
415 views

What wire runs between two speakers on a headphone, and how do I replace it?

I have a Sennheiser HD 280 Pro pair of headphones. There is a wire running through the bow that connects the left speaker in the headphone to the right one (see drawing, red line), I managed to snap ...
Olaf's user avatar
  • 151
3 votes
6 answers
1k views

10Ω series resistor in output of headphones amplifier

I managed to reverse engineer a headphone amplifier in a USB DAC that I bought on aliexpress. As I expected there is a electrolytic capacitor in series to the output, but there is also a 10Ω resistor ...
urhen's user avatar
  • 411
3 votes
3 answers
17k views

PC Headset crosstalk

I had issues with crosstalk (microphone picking up headphones sounds) and thought it was caused by headset. So I removed headset's original cable, put 4 pole female 3.5mm jack on the headset and ...
typekcz's user avatar
  • 41
3 votes
1 answer
570 views

Channel separation on a 3.5mm audio jack

I read an article regarding the removal of the 3.5mm audio jacks on phones. It quoted this: ...
Thomas's user avatar
  • 1,049
3 votes
2 answers
15k views

Understanding voltage levels on 3.5 mm audio output

In the hope of using the standard 3.5mm audio output found in your average PC/smartphone to control (not power) a DC motor, I was measuring the voltage between GND and Tip and noticed the following: ...
BlenderBender's user avatar
3 votes
2 answers
818 views

Help me interpret this audio jack schematic

I'm having trouble interpreting the following schematic: From this drawing: Adam Tech ASJ-99H-R-HT-T/R drawing I want to know: Are 5 and 6 normally open (open when there's no plug inserted), or ...
castle-bravo's user avatar
3 votes
2 answers
51k views

Headphones volume controls do not work after 4 pole jack repair

I have been repairing the jack for my pair of Sennheisers for Android (I have done 3 attempts so far) but I can't seem to make the volume controls work. To clarify, after the repair, the sound is ...
ld_pvl's user avatar
  • 183
3 votes
4 answers
6k views

How does the mobile 3.5mm audio port work, and Can I light a LED from it?

I am trying to do this, light a LED from the headphone wire(mobile) but it seems it gives ac in there, I don't have much idea, please help.
Hrishikesh's user avatar
2 votes
4 answers
5k 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 ...
Emerson's user avatar
  • 413
2 votes
1 answer
217 views

Kids Bluetooth Headphone Volume Limit mod

I have purchased a set of NIA X2 Bluetooth headphones for my kid which are very convenient. However, my advice for lowering the volume is constantly bypassed, so I would like to mod them in order to ...
felix's user avatar
  • 21
2 votes
1 answer
6k views

Headphone OUT to microphone IN for mobile phones

My AIM is to feed audio to mobile phones over MIC IN port. This audio would be coming from Laptop's headset out port. The way i am testing is making call from the test device which is connected to my ...
Faiz Ali's user avatar
2 votes
1 answer
123 views

Replacing a virtual ground circuit with center tapped transformer

I just bought a cheap headphone amp (those 47 Amp). I aiming to replace the voltage-divider-virtual-ground circuit with a 12v-0v-12v transformer (ofc with rectification). I checked the NE5532's VCC+'s ...
XtraCode's user avatar
  • 125
2 votes
1 answer
605 views

Line Level to Mic Pad Working Randomly With Phones

I'm trying to build my own headphones to mic pad. I want to connect the input of the pad to a phone's headphones conector and the output of the pad to a second phone's mic connector. Both phones ...
Mister Smith's user avatar
2 votes
1 answer
225 views

How to create an airline headphone adapter?

So, I have a predicament: I am a 6'5" guy with massive ears. Like it's not funny how big my ears are. When I go on an airplane, the headphones they give me are terrible and hurt my ears when I wear ...
a.mosallaei's user avatar
2 votes
2 answers
333 views

How does headphone volume correspond to driver excursion?

I was curious about how driver excursion in a headphone corresponds to the volume that music is playing at. For this question, let's use my current headphone as an example. It's the Audio Technica ...
Anthropologist's user avatar
2 votes
2 answers
1k views

using headphones as microphone

I am learning about headphones and microphones and I have 2 questions. I bought a few pairs of headphones from the dollar store and took one pair apart. There is a weak little magnet in the center ...
dactyrafficle's user avatar
2 votes
2 answers
281 views

Analog Android headphone command circuit not working together with microphone

I'm trying to make a headset with microphone (and stereo audio) for an Android phone. The headset will be connected to a 3.5 mm TRRS jack. I have read the specifications for such devices from Android ...
TonninSeteli's user avatar
2 votes
1 answer
204 views

How to use the button on a headset?

I want to implement push to talk on my custom PCB. I apply a 2V DC bias on the microphone line of the jack through a 2.2k resistor. While pressing the button of the headset I see the resistance ...
VicMac's user avatar
  • 33
2 votes
1 answer
225 views

Hotwiring a Bluetooth speaker into a Bluetooth receiver [closed]

New here. So I have this mini Bluetooth speaker I bought a few years ago. Fast forward to now, and I've upgraded from it. Was going through a junk box and found it again, and wondered if I could just ...
Jon's user avatar
  • 29
2 votes
1 answer
78 views

How does the voice coil affect volume in DIY headphones?

I know nothing about electrics. I am learning some very basics by making a pair of incredibly simple headphones with a 3.5mm jack, some enameled wire, some magnets, and some paper cups. After a bunch ...
harpomiel's user avatar
  • 121
2 votes
0 answers
7k views

How to connect 5 colored wire headphone to 3.5 TRS jack?

I have a somictone headphone and I want to repair its headphone jack, It contains five colored wires. Here are the wire and TRS jack. Please give me a feedback Can you please tell me how to wire this?...
Isuru Abey's user avatar
2 votes
0 answers
79 views

Portable Headphone Amp Power Supply 18V MCP73871 TPS61178 TPS7A470

Disclaimer: I'm fairly new to diyaudio, amplifiers, power supplies, schematics, PCB design and everything that this forum touches on (read: noob), so I urge you to be patient with me - I am eager to ...
Mladen G's user avatar
1 vote
1 answer
398 views

Why are there not more incompatibilities in 3.5mm audio jacks?

I use 3.5mm audio jacks for my boom box, laptop, android phone, iPhone, iPod Touch, portable personal analog FM radio (no external speakers), and my classical sound system on a shelf. I assumed that ...
user2153235's user avatar
1 vote
3 answers
540 views

Discrete headphone amplifier output stage

What is the role of R13? I tried simulating this circuit using the Falstad simulator and removing it changed nothing. It is a circuit from Small Signal Audio Design by Douglas Self, second edition.
mrazoun's user avatar
  • 13
1 vote
1 answer
132 views

What type of headphone connector is this? [closed]

I got a pair of Onkyo headphones as a gift a while ago, and now one of the connectors on the cable broke (the red one in the picture). What type of cable connector is this? Searching the Onkyo ...
Daniel Lenz's user avatar
1 vote
1 answer
683 views

How can I make a L+R+mic audio dongle to record an Android phone's own output?

I'm looking for a way to wire the stereo output of a device into its own mono microphone input. This will be soldered as a 4 pin 3.5mm TRRS audio jack. I need to record the output of my smartphone on ...
Krzysztof Bociurko's user avatar
1 vote
1 answer
111 views

Headphone sensitivity/efficiency

Most commercial headphones are advertised to have sensitivity greater than 90 dB/mW. But to my understanding, even with 100% efficiency that's not possible (if we use 10 log (I/I0) where I = 1 mW, we ...
Likhon's user avatar
  • 123
1 vote
2 answers
2k views

Increase headphone impedance using resistors

I have an LG-V30 cellphone, which has an integrated headphone amp with two modes for audio reproduction depending on the headphones you plug in. Normal mode for headphones under 50 ohm, low output, ...
Joseph Sabido's user avatar
1 vote
3 answers
96 views

Electret microphone to headphone does not work

I would like to make a circuit that takes an electret microphone as an input and the output will be the sound recorded by the microphone with amplification. I've built the circuit with one amplifier (...
arnaudontour's user avatar
1 vote
2 answers
9k views

Converting a headphone output to line level

I have a guitar amp that has a headphone output. I would like to convert this signal to line level so I can use it in a small mixer along with other line level signals to be heard in "in ear" style ...
cat pants's user avatar
  • 425
1 vote
1 answer
3k views

Replacing a broken 3.5mm audio jack with a different one, why does each cable have different amount of wires?

I found a nice speaker system that seems to work except the 3.5mm audio jack is damaged (it's missing the tip of the conductor for left channel audio). I gathered some broken audio cables with 3.5mm ...
cr0's user avatar
  • 167
1 vote
1 answer
340 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 ...
fuzzybabybunny's user avatar
1 vote
2 answers
2k views

sensitivity vs impedance of headphone

My understanding of the audio domain is very bad and I apologize for that. In a Wikipedia article, they say in the "History" section that "Those headphones used with early wireless radio had to be ...
MikeTeX's user avatar
  • 1,864
1 vote
1 answer
390 views

how to drive 1930s bakelite headphones

I’ve received a very old pair of mono bakelite headphones that I would like to re-use for demonstration purposes. Just for voice audio and morse code tones. The writings on the side of each headphone:...
captcha's user avatar
  • 382
1 vote
1 answer
61 views

Replacing headphone wire

I am trying to replace a broken head phone wire (with three terminals). Here is the overview of the headphone, showing the broken part: Here is the close up of the other end, showing it has three ...
javanoob's user avatar
  • 117
1 vote
1 answer
69 views

Connect multiple earphones (with microphone) to one computer

I would like to connect up to 4 pair of earbuds (the in-ear type, stereo, with a TRRS connector and a tiny condenser microphone located along the cable, think iPhone wired earbuds) to a single ...
Tobia's user avatar
  • 767
1 vote
2 answers
856 views

Headset microphone is noisy, but touching speaker wires removes the noise

I'm repairing my simple wired headset which is composed of two little speakers and one microphone. The audio and mic jacks are separate. The speakers work fine. But the microphone is very noisy. As I ...
Pedram's user avatar
  • 113