Looks like it needs a bit of work.
You should probably have a zobel on the output.
Don't forget to use compensation on the NE5534, I would use the NE5532 instead.
You don't need driver transistors.
Here is a headphone amp from an older top-of-the-line McIntosh preamp.
http://i56.photobucket.com/albums/g196/dkleitsch/C32.jpg
It looks a bit like the AKSA power amp without the outputs.
You should probably have a zobel on the output.
Don't forget to use compensation on the NE5534, I would use the NE5532 instead.
You don't need driver transistors.
Here is a headphone amp from an older top-of-the-line McIntosh preamp.
http://i56.photobucket.com/albums/g196/dkleitsch/C32.jpg
It looks a bit like the AKSA power amp without the outputs.
I don' t need too good amp, I need only something cheap (I will make 4 stereo drivers) with enough power and voltage for wide range of loads, and not as bad as LM386.
Driver transistors are the 2N..? I simulated distortion, and it came out better with them.
The choose of transistors is because I have enough of them from some recent project, but will BCxx and BD139/140 make a difference?
And what about TL072 instead of the NE5534/2?
What values of zobel do you suggest for headphones?
Driver transistors are the 2N..? I simulated distortion, and it came out better with them.
The choose of transistors is because I have enough of them from some recent project, but will BCxx and BD139/140 make a difference?
And what about TL072 instead of the NE5534/2?
What values of zobel do you suggest for headphones?
For reference...
A project something like your project:
http://headwize.com/projects/showfile.php?file=eaton_prj.htm
The circuit diagram from that project:
http://www.headwize.com/images/eaton2.gif
Other interesting reference projects:
http://headwize.com/projects/index.htm
A project something like your project:
http://headwize.com/projects/showfile.php?file=eaton_prj.htm
The circuit diagram from that project:
http://www.headwize.com/images/eaton2.gif
Other interesting reference projects:
http://headwize.com/projects/index.htm
"The choose of transistors is because I have enough of them from some recent project, but will BCxx and BD139/140 make a difference?
And what about TL072 instead of the NE5534/2?"
The 5534/32 sounds quite a bit better in the mids and bass than the TL07X opamp in this circuit.
"What values of zobel do you suggest for headphones?"
It has nothing to do with the headphones, it is for amplifier stability. I generally use 0.1uF and 10 ohms.
The Eaton2 looks like a good project. The MJE243/253 are much better devices for outputs than the MJE340/350.
And what about TL072 instead of the NE5534/2?"
The 5534/32 sounds quite a bit better in the mids and bass than the TL07X opamp in this circuit.
"What values of zobel do you suggest for headphones?"
It has nothing to do with the headphones, it is for amplifier stability. I generally use 0.1uF and 10 ohms.
The Eaton2 looks like a good project. The MJE243/253 are much better devices for outputs than the MJE340/350.
kubeek said:No LT10 or mje243/253 in here
I think Bonsai meant LT1010.
See the first figure on the LT1010 datasheet: LT1010 + LT1056 + LM334 = instant headphone amplifier (just add potentiometer and 18Volt power supply).
some relatively common headphones can require over 100 mA peak current to reach realistic spl
most older (available in PDIP) op amps can't drive that much current and require output current boost/buffers
but there is little need for darlington level current gain
a single ef with Class A ccs bias should be fine as output buffer inside the op amp feedback loop
most older (available in PDIP) op amps can't drive that much current and require output current boost/buffers
but there is little need for darlington level current gain
a single ef with Class A ccs bias should be fine as output buffer inside the op amp feedback loop
Any good opamp can deliver 10ma, drive an output with a Beta of 50, you can drive 500mA peak.
Build an Aleph type current source and set it to 200mA, it will be able to provide 400mA peak.
Run it all on ±10V, the output and current source will both dissipate 2W, and be able to drive 1.25W class A into 16 ohms.
Build an Aleph type current source and set it to 200mA, it will be able to provide 400mA peak.
Run it all on ±10V, the output and current source will both dissipate 2W, and be able to drive 1.25W class A into 16 ohms.
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