| Electronics > Beginners |
| Audio amp help |
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| jeffheath:
Looking for the simplest solution to take stereo composite audio (red and white connectors) and output to a headphone jack (stereo) with a volume control. I know there are tons of amp boards on amazon, but apparently something like a small class D amp board isn't a "linear" amp and would not sound good with headphones. The closest thing I could find was a phono preamp that happened to have a volume control and phono output, but cost way too much. Suggestions? |
| graeme.c.payne:
Not sure if you are looking for a finished product or a DIY project. If you want a finished product, there are a lot available with a wide range of price and performance. (I searched for "stereo headphone amplifier" on Amazon. Keep in mind that headphones demand the same high quality audio but at much lower power levels than needed by speakers. A "phono" amp is definitely not what you need. A phono amp is designed to equalize the output of a phonograph and provide it to the line-level input of an audio amplifier. Sent using Tapatalk |
| jeffheath:
--- Quote from: graeme.c.payne on February 11, 2019, 11:35:05 pm ---Not sure if you are looking for a finished product or a DIY project. If you want a finished product, there are a lot available with a wide range of price and performance. (I searched for "stereo headphone amplifier" on Amazon. Keep in mind that headphones demand the same high quality audio but at much lower power levels than needed by speakers. A "phono" amp is definitely not what you need. A phono amp is designed to equalize the output of a phonograph and provide it to the line-level input of an audio amplifier. Sent using Tapatalk --- End quote --- Definitely DIY, although I thought if I could find something cheap enough that did this I would just use it altogether. The only thing I can find that does what I need is this: https://www.amazon.com/Sabaj-Audio-Portable-Headphone-Amplifier/dp/B01EUFQAQS/ref=sr_1_29?keywords=stereo+headphone+amplifier&qid=1549928508&s=gateway&sr=8-29 and it's just plain too expensive. I don't need uber audio quality, I was just looking for something like a DIY schematic of a solid composite audio to (stereo) headphone jack setup. |
| oPossum:
You can use a 'high' current op-amp such as the NJM4556 for a headphone amp. Google 'cmoy headphone amp' for some circuit ideas. https://en.wikipedia.org/wiki/CMoy |
| Zero999:
--- Quote from: jeffheath on February 11, 2019, 10:55:34 pm ---Looking for the simplest solution to take stereo composite audio (red and white connectors) and output to a headphone jack (stereo) with a volume control. I know there are tons of amp boards on amazon, but apparently something like a small class D amp board isn't a "linear" amp and would not sound good with headphones. The closest thing I could find was a phono preamp that happened to have a volume control and phono output, but cost way too much. Suggestions? --- End quote --- Modern class D amplifiers are fairly linear can and have very respectable THD figures. They're commonly used in smart phones and portable music players. It's quite likely you won't be able to hear any difference between a modern class D amplifier and a class AB amplifier, if you don't know which type you're listening to i.e. a blind test. There are other reasons not to want class D such as RFI emissions, although they can be minimised by proper filtering. What's your budget? How about the MAX97220? It's class AB, not D and modules are available off ebay. https://datasheets.maximintegrated.com/en/ds/MAX97220A-MAX97220E.pdf https://www.ebay.co.uk/i/382694778166?chn=ps |
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