Hi All,
I have some NJM4556 op amps lying around and was wondering if anyone had an available schematic for putting together a headphone amplifier? Sound quality doesn't have to be anything amazing, I just want to put a system together with a pot to control headphone volume from a line output. Otherwise if someone has any advice or would like to steer me in a different direction, I'm all ears. I would just prefer to use what I already have, but of course if I have to buy an op amp or two thats not the biggest issue. I just want a simple design that works well. Thanks in advance!
Pat
I have some NJM4556 op amps lying around and was wondering if anyone had an available schematic for putting together a headphone amplifier? Sound quality doesn't have to be anything amazing, I just want to put a system together with a pot to control headphone volume from a line output. Otherwise if someone has any advice or would like to steer me in a different direction, I'm all ears. I would just prefer to use what I already have, but of course if I have to buy an op amp or two thats not the biggest issue. I just want a simple design that works well. Thanks in advance!
Pat
http://www.cn.njr.com/PDF/NJM4556A_E.pdf
You will be able to work out component values but if you use 10k and 1k as feedback that will give a few volts of signal for your headphones.
You will be able to work out component values but if you use 10k and 1k as feedback that will give a few volts of signal for your headphones.
They work pretty well in a Cmoy, your basic-bones amp, and they are used in NwAvGuy's O2 HPA current-gain stage. Since it sounds like you want something basic I'd try a Cmoy first, but make sure to use at least 18V (+/-9V) to get decent performance from it.
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You will find all the answers on NwAvGuy: Cmoy With Gain
@JoeB83 For sensitive h/p in 16-32 Ohms range, +/-5V supply is better suited, as lower supply voltage results lower thermal dissipation. I had small discussion with NwAvGuy on the same as I was facing thermal problems with SOIP JRC4556.
@JoeB83 For sensitive h/p in 16-32 Ohms range, +/-5V supply is better suited, as lower supply voltage results lower thermal dissipation. I had small discussion with NwAvGuy on the same as I was facing thermal problems with SOIP JRC4556.
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You're right, I just assumed higher impedance headphones would be used. I kind of forget about them when the lowest impedance IEMs I have are 100 ohms. 🙂
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