| Electronics > Beginners |
| Dual headphones? |
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| senso:
The simplest and proven working solution would be to just make a pair of CMoy headphone amps: https://tangentsoft.net/audio/cmoy/ |
| Audioguru:
Like the TPA152 amplifier, the cmoy headphones amplifier cannot drive multiple headphones loudly, only one set. How much power do your headphones need and how loud do you want?? The maximum loudness of music that is not over compressed allows loud peaks but normal loudness for average. Movies might be over compressed and are very loud all the time. You do not want sounds that are loud enough to destroy your hearing. |
| Buriedcode:
--- Quote from: Duzzy on April 16, 2018, 12:40:54 pm ---Yep, the wife and I occasionally walk and like to listen to the same thing. I just want 2 sets of 32ohm headphones to sound the same as 1 set when plugged in. No gain required. --- End quote --- Ahh so it should be portable. That means, small(ish.. I'm not suggesting you require something the size of a pound coin) and battery powered. A lot of cmoy type headphone amps run off a 9v battery. Whilst this is fine, provides enough headroom for opamps that aren't rail-to-rail, is small, light, and generally does the job. But I hate them - they are expensive, and have crap capacity. Then again......... they are convenient, you can buy them anywhere, and they don't have the added complexity (and possible slight danger) or lithium polymer). Like everything in engineering, its all a compromise depending on the requirements! So really the decisions on what kinds of amps you use could be down to the sort of enclosure you want to use, rather than features. Those modules were just a suggestion, I haven't found somewhere in the UK that sells them, so the shipping can take weeks which is annoying. But they're cheap and do the job. I'll stop flooding the topic with ideas/suggestions - quite often it is a hindrance to have more options, I end up paralysed by indecision. Good luck, and making guitar pedals was how I got started in electronics - it actually provides quite a good grounding (punn intended?) in analogue because even though fuzz boxes are meant to distort, its all the same principles. |
| Duzzy:
Hi all, Thanks for taking the time to discuss this with me. The C-Moy is where I started but on the front page of the tangent site there is a link for the question "Can I make it drive multiple sets of headphones?" and the answer is 'Not with the circuit as-is. You have to create a distribution amp instead.' which is where I started to disappear down the rabbit hole.... I am obviously ignorant here and audio signals, well to me, are just plain weird. I come from a level where AC means a minimum of mains 240v and a capacitor is like a battery not a filter. Ok I may have known for years what the visual representation of a sound wave looks like, but I never made the connection between that and electricity. Well, not properly. I used to do digital logic and protocol analysers and that kind of stuff in a previous life but always worked several layers above the hardware. I also didn't want my first ever post on EEV to start rambling. That said... :) My phone, Galaxy S5, drives my headphones (SONY - MDR-EX650APT) just fine. When I plug in an additional identical pair of headphones via a Y cable, into my S5, the sound quality diminishes (presumably on both sets of headphones, but my wife is not keen on me stuffing her buds into my ears to check. Fair play.) I think I might be running into the issue this webpage http://nwavguy.blogspot.co.uk/2011/02/gain-and-headphone-ampsdacs.html describes as "Non-Zero Output Impedance" as it seems to be the bass that I think starts to.. well actually, get muddy. All I wanted was a zero gain doo-dad that I could plug my phone into so that it thought it was driving a single pair of 32 \$\Omega\$ (yeah. I found the obvious button :palm:) headphones and then the same doo-dad took that signal and drove 2 pairs of 32 \$\Omega\$ headphones as if each output (dual) was the phone, same volume, same quality, nothing added, nothing taken away. Also I am listening to mp3's so 'quality' is already hmmm. Honestly it sounded so simple to me. Duplicate a signal. How hard can it be? :scared: Blimey this has taken so long that I've got a warning about a new reply whilst I have been typing! D |
| picandmix:
Cannot help with the detail, but that Berhinger 4 way headphone amp I mentioned uses an individual op amps chips for each output similar to the cmoy, but also has an input op amp of the same type to drive them. btw , the cmoy gives a fair sound, but if you want a noticeable sound improvement then that diyaudio link amp can be build as a portable version, see his thread and home page. The guy whos thread it is, is very helpful and may be able to suggest a good way to drive 2 sets of cans. ( have built and used both the cmoy and the diyaudio amps myself) |
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