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Old 30th August 2007, 08:26 PM   #11
hughmon is offline hughmon  United States
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If you want inexpensive (under $1 USD) the NJM2073D comes to mind (12V, 1A, 8 pin dip, dual op amp). For more standard op amp specs (+/- 15V) operation the NJM4560 is commonly used in commercial gear. The NJM4556 also works.
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Old 31st August 2007, 09:21 AM   #12
kubeek is offline kubeek  Czech Republic
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hughmon: none of the three are available here. So any other suggestions?
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Old 31st August 2007, 09:40 AM   #13
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Hi kubeek,
Your circuit seems OK. I'll sim it for you later today and see how it fares. I think it's OK. In fact you might be able to get away without those diodes . Just run the output stage in a low quiescent current class A design and dump the diodes and put a couple of resistors instead. I've tried that and it sounds fine. The slight current variation with temperature will not matter at all. Very unlikely to have a runaway bias condition. I'll put in the required resistor values also.
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Old 31st August 2007, 10:36 AM   #14
kubeek is offline kubeek  Czech Republic
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I just did the distortion analysis (without the proper transistors..) and the diode version shows about 2x lower distortion than with resistors.


I compared it at 4.5mA quiescent, and into 16ohm resistive load. The diode version shows 0.01%THD with 10kHz signal measures up to 100kHz. It is mostly even-order distortion.
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Old 31st August 2007, 01:21 PM   #15
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You should run it in classA till about 100 to 105 dB. So that depends on the impedance of the headphone. I was under the impression that most monitoring phones were much higher than 16 ohms.

With 4.5 mA you are probably out of the class A region.
You could sim that and check it out.
Cheers.
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Old 31st August 2007, 01:31 PM   #16
kubeek is offline kubeek  Czech Republic
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This is not for monitoring in the way of hearing the mix when mixing/mastering, this amp will be for the people who are recording and need to hear themselves and the pre-recorded rest of the band in the headphones. And because for this you can use almost any cans, I want it to work with low impedance as well.

I donīt think that class A is a must here, so I guess AB will do it well.
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Old 31st August 2007, 02:21 PM   #17
digi01 is offline digi01  China
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I think its no need making a especial headamp for studio.

FYI:
in my studio,I get all return monitor headphone powered from my pc multimedia speaker.I split 6 stereo channel via some 47ohm resistors from the speaker.
there are one k141m for recording room and some k100 for musicians,they work great.

Zang
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Old 1st September 2007, 05:24 PM   #18
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The NJM4556 is very good for driving headphones. The Grado RA1 uses just one of these chips.
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Old 1st September 2007, 06:18 PM   #19
kubeek is offline kubeek  Czech Republic
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From NJMs I can get only 4580, and some motor drivers....
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Old 1st September 2007, 08:53 PM   #20
hughmon is offline hughmon  United States
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It may be possible to parallel the two amps in the NJM4580 to get increased output capability. 27 ohms would probably work for output sharing resistors. Breadboard it first to make sure the concept works. At $.34 each (at least around here), a very inexpensive option.
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