Headphone amplifier breadboarded and tested - DIY !

This is a fairly simple headphone amp design. How good can it sound? I perform some tests to see how good it is.

[SANJAY-ArtnStuff]

Cool little amp. good explanation Sir.

[madkaz]

I build it, and it sounds amazing. PG and SG should be connected. It's the same Ground point. With two LME49710 it has zero noise at max volume with no signal. Thank you for schematic!
UPD: I replaced 47uF caps to 100uF. Not sure, but feels like sounds better.

[MarkErikEE]

Just finished my version of this circuit last night. It works for sinewave on 30 Ohm load - now I have to hook up earphones and take a listen. Running on two 9v batteries with NE5532 front end. Thanks, John, for the simple circuit.

[razaaejaz]

I would like to see your next video to this in which the amplifier in finalized on a perfboard and final amp is build.

[getfull]

This is exactly what I was looking for and the exact amount of resistance for my headphones thank you so much

[edwardjeffes]

Would love to see a review of op amp driving 32 ohm headphones at low voltages (3 -9 volts) for portable use . Great project.

[rich]

If you find yourself needing better equipment to measure the limits of your amp, you did something right :)

[HVACtuner]

I made the "Power amp" version of this.
With darlingtons. 8W 8Ohm, 6Amps, short circuit proof etc :D
10Hz-50 kHz linear.
Simple but perfect circuit.
Of course the soul of it the perfect IC.
If you dont need darlingtons, BD-s are much better for High frequencies.

[nabman_]

Hey John. I hope you read this comment in this 6-year-old post. I came across your channel recently and been enjoying watching your videos a lot. Thanks for sharing your knowledge. I'm interested in building this headphone amplifier to power my old Beyerdynamic DT331 (40 ohm, 86dB/mW) at no louder than 80dB (to not make my tinnitus worse lol). DC power would be from a 19V 1.5A SMPS adapter I have. Assuming DT331 dips to 20 ohms and its sensitivity measured at 1kHz (I couldn't find an impedance graph or detailed specs), I estimate I would need 7mA (both channels) or 28mA (for +6dB headroom at low frequencies). Biasing the transistors would require 4mA, and the NE5532 idle draw is 8mA. Thus my total estimated peak current requirement equals 40mA. I'm thinking of using a TLE2426 IC to split the rail. Would you agree with my current estimation and do you think TLE2426 would work in this case (or too close to its limit)? Thanks. Bill

[Satyajit_Dey]

Hi John.. I am pleased to say and want to thank you for this video. I wanted to DIY a headphone amp and I have implemented your schematic and made a headphone amp with some modifications. Also made schematic and PCB design and the PCBs are being sent to me as I am writing this. The sound quality of this amp is astoundingly good. I would like to thank you and share with you my project. Please let me know how I can do so.

[johnnyphoney]

Thanks for the video and schematic! You didn’t use a heatsink on the video, is it even required for this build?

[gerardoromano]

Hi John if I want to drive 32 ohm headphones (half impedance as yours) what change have to make to the circuit ? or use It just live the values as you stated un this video ? If you can take a minute to unswer this question I´ll order the parts to build one for myselt (probably put an output capacitor just in case one off the output transistors fail and pass DC to my headphones (cost me a little fortune), you know there are knock t off ransistors offs). Thanks in advance

[amitghosh]

Can a 32 Ohms headphone be used on Front & Rear Line out sockets on Desktop computer without headphone amplifier?

[mashrien]

Would you be able to design one of these for two isolated stereo inputs to a single output? Would be *incredibly* useful for we nerdy gamers (eg; TV audio out from consoles and PC audio combined and amplified, to be fed into good high-impedance headphones)

[molecula]

is there a way to determine what type of resistor do you have in stock (I mean metal oxide vs carbon) ? Any visuals ?

[ahmadfaraz]

Dear john, I build this amp for someone about 2 years ago, he had hi end types of headphones, recently i dont know what went wrong in the circuitry, but my friend lost left side of his headphones.

I need to request that it would be a good idea to hv a speaker protection based on upc1237h in this final diagram. Im not good at working with relays john. That's why im requesting.

[Ratkill]

Would you be able to substitute some JFET in without much modification? Working through the circuit on paper and I'm having some trouble

[frontier]

So I built this kind of headphone amp but its got bugs. I see how you put power to wrong pin, then I looked up internet data pin out to double check if I did that and I get a "wrong" pinout and go switch pins and ... well not good. LOL.

[Dazzwidd]

70 ohms is low for a headphone I would have thought. Most headphone outputs would expect 600 ohms... unless im wrong. But the point is, in which case, its actually over loading

[jasonlaverty]

Great video John.
Im just starting out messing about with op amp circuits and was wondering why you used a 2.2uF cap on the input as this seems high to me due to it passing frequencies as low as 7Hz. (im sure you have a good reason for it). I have yet to build it but, it will the next one into my breadboard later this week and Im looking forward to trying to get it to work for my 250 ohm Cans. Cheers.