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Old 11th August 2014, 04:07 AM   #1
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Default Need Headphone Amp Schematic for NJM4556

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
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Old 11th August 2014, 09:06 AM   #2
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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.
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Old 11th August 2014, 06:38 PM   #3
JoeB83 is offline JoeB83  United States
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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.

Last edited by JoeB83; 11th August 2014 at 06:41 PM. Reason: Added missing info
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Old 13th August 2014, 09:04 AM   #4
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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.
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Last edited by availlyrics; 13th August 2014 at 09:20 AM.
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Old 13th August 2014, 04:59 PM   #5
JoeB83 is offline JoeB83  United States
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Quote:
Originally Posted by availlyrics View Post
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.
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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Old 18th December 2014, 08:05 PM   #6
olex is offline olex  Ukraine
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