# Tag Info

Accepted

### Loud pop noise while plugging to a headphones jack

That's a "DC pop". A sound engineer dies somewhere every time you make one! simulate this circuit – Schematic created using CircuitLab Figure 1. Amplifier output and disconnected speaker. ...
• 176k

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

The "buzz" is almost certainly RF pickup. This can be the mains (low frequency, 50/60/100/120Hz, unlikely in this scenario given a phone is involved) or rectification of the carrier frequency of the ...
• 66.1k

### Loud pop noise while plugging to a headphones jack

"Exactly like when a charged object is discharged and it needs some time to charge up again." That is exactly what you are hearing. The output is AC-coupled through a capacitor to the headphones to ...
• 46.7k
Accepted

### Can an electrolytic capacitor withstand 0.1 V reverse polarity?

"Can an electrolytic capacitor withstand 0.1V reverse polarity?" If you query e.g. technical documents of a well known manufacturer like vishay: Reverse Voltage UrevA reverse polarity of up ...
• 2,598

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

The main fact, in my opinion, is that noise is heard only in right channel. First thing comes to mind is issue with grounding. But then both channels would receive the noise. Second - the source of ...
• 7,098

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

My guess is that there is a break in the insulation of the right earbud and that electrical hum from your body is flowing into the noise cancellation amplifier. Try wrapping the bud in cling film and ...
• 33.9k
Accepted

### How do high-impedance headphones work?

For a given applied voltage on the headphone speaker (say 1 volt RMS) the power into an 8 Ω speaker will be 125 mW. Into a 300 Ω speaker it will be 3.333 mW. That's a decibel reduction in sound of ...
• 457k
Accepted

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

Headphones (without microphone) only use the 3 pin (stereo) type jack and these are all wired the same. The assignment for the 3 left/right/ground conductors is standard. The different standards ...
• 80.9k
Accepted

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

The 470 ohm resistor to ground keeps the headphone output DC level biased to 0V. The amplifier chip output is biased to VDD/2 so if there resistor is removed, the both capacitor ends would measure VDD/...
• 149k

### Can an electrolytic capacitor withstand 0.1 V reverse polarity?

Yes, aluminum electrolytic capacitors (which is the kind you have) are fine with a bit of reverse voltage. A fraction of a volt is definitely not a problem. Edit to incorporate comment: Aluminum ...
• 398k
Accepted

### What kind of wire is this? Copper wire with some kind of wool in it

The copper is not exposed but has a layer of lacquer on it, so it won't make connection just by twisting. You need to dissolve burn away the lacquer somehow, such as with a soldering iron.
• 149k

### How do high-impedance headphones work?

The impedance of the headphones isn't the only factor. You also need to think about efficiency, which tells you how much power you need to produce a certain loudness. Efficiency is measured in ...
• 22k

### How do high-impedance headphones work?

Compare very old $4000 \Omega$ with modern $32\Omega$ headphones. When connected to the same audio power amplifier, they yield similarly-loud audio output. Both use similar electrical ...
• 25.9k
Accepted

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

The two large capacitors are acting as AC coupling capacitors. A capacitor in series with a signal acts as a high pass filter (if you're curious about that, look into the impedance model of capacitors)...
• 106

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

If you have a multimeter available, you can put it into AC voltage measurement mode and try to measure between the different metallic objects. Note that you should only touch the objects with the ...
• 8,443

### How do high-impedance headphones work?

I don't know why you think you should not hear anything with "high impedance" headphones but that's wrong. They just have higher impedance than normal headphones. So any PC or mobile phone ...
• 149k

### Loud pop noise while plugging to a headphones jack

@Transistor is right, however there is a tiny subtlety here... Jack connectors short everything to ground when you plug them in. When you slide it in, the various metal bits of the jack and the plug ...
• 77.5k

### Kids Bluetooth Headphone Volume Limit mod

Adding resistance in parallel will not attenuate the signal. It will draw more current from the amplifier output, however, and if the resistance is low enough will cause current limiting. This would ...
• 176k
Accepted

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

There are several problems with your design: The Op-amps you use on the input are typically not DC biased. You have no isolation capacitors on your input and no resistor to ground to supply a Gnd ...
• 21.8k

### How to tell the difference between headphone wires?

Wire color isn't standard. Never trust wire color. Always use a continuity tester to find which wire goes to which conductor.
• 73k
Accepted

### How should I connect a braided shield 2-core cable with a headphone plug with three cores

I'll assume your jack is a stereo one, like on this picture: Cable shield goes to ground (see pic) and left/right signal wires go to the two smaller lugs.
• 77.5k
Accepted

### What type of headphone connector is this?

Searching for a format specification starting with the manufacturer of the product: From the vendor you mentioned Onkyo is offering the ES-HF300 with a 6N oxygen-free copper cable encased in clear ...
• 108
Accepted

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

The short answer is you can use pretty much any thin two core stranded wire. The fluffy stuff is just cheapness; manufacturers have been experimenting for years as to how much copper they can replace ...
• 2,651

### Headphone OUT to microphone IN for mobile phones

This will take the headphone/speaker/line level output from a typical laptop or tablet or music player (or even another phone). It will attenuate it down to microphone level, and then C1 will block ...
• 14.5k
Accepted

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

There is no 100% sure answer to your question. Because we (and maybe you?) don't know exactly what microphone you are talking about and how it is wired. There is more than one convention for wiring ...
• 14.5k
Accepted

### Regulating LED brightness using headphone output

Here is something that seems to meet your specs: C1 AC-couples the signal so that it can have any DC offset inside the circuit we like. D1 and D2 rectify the input signal to its peak voltage, minus ...
• 313k
Accepted

### Planned obsolescence / failure of consumer electronics / kill switch

I've worked on countless consumer products, and I've never seen a "kill" circuit that intentionally causes the product to fail after some specified period or event. However, consumer products are ...
• 23.9k

### Are headphones with EMF measurement of 10,000 milligauss harmful to me?

The ability to measure something, with your phone app for instance, makes it far easier to worry about it. Consider the mass experiment that is being done now, has been ongoing for the past few ...
• 166k
Accepted