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Old 8th June 2004, 04:01 PM   #1
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Default New best wide world headphone amplifier

Better schematic to normal, common, standard headphones that cannot hold to much iddle current,

This one smaller iddle, total 640 mA, this way divided into 4 capsules will be safe.

Power also reduced, and current around 150 mA

Sorry, my mistake.... the other one too big to common cheap headphones (cheap and common, but sometimes very good)

Carlos
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Old 8th June 2004, 07:06 PM   #2
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Default Scratch 1

Here is.

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Old 8th June 2004, 07:08 PM   #3
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Default Scratch 2

Here is.

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Old 8th June 2004, 07:09 PM   #4
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Default Scratch 3

Last one.

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Old 8th June 2004, 09:42 PM   #5
maylar is offline maylar  United States
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Carlos -

DC current through the headphone voice coil is a bad idea. It biases the driver off center and reduces the excursion in one direction. It also dissipates unnecessary heat. Better to use a resistor collector load and couple the headphone through a capacitor.

Also, if you want a simple class A driver like that, at least put some resistance in the emitter for bias stability. Otherwise the operating current will depend completely on transistor parameters, and drift badly with temperature.
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Old 9th June 2004, 02:56 AM   #6
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Default You rigth, but try it someday.

If you not already donne, try it someday, just to kid with those things, you will be very well impressed.

If current do not put your "speaker" driver too much to front or back, in other words if not reach near limit excursion you will hear an incredible sound. I made it with old Germanium transistor, and it is working till today, some small noise can be heard, but also noise is a part of nature too... when locked inside a compression chamber, or opposite chamber, decompression chamber, will will hear noise, and not because pressure, because without pression, in silence, the brain and ear noise floor appear... silence its hard to be obtained.

My own was made with 150 ohms resistance (not impedance) Senheiser Microfone, a professional material saved from a fire in our biggest televisions station, this one, by itself is wonderfull, and can be used as dinamic microfone too, with a very good sound... a little easy to saturated in low frequencies.... if you breath on it, diafragm moves backwards... but it has 7 plus 7 milimeters compliance...in my own "reference" audio it moves downwards something about a half... goes down 3 or four milimeters and you do not fell heat touching it minutes after powered.

This is the best (not related energy passing througth it, i now your worries are correct) way to couple, this is the completely direct couple, no transformer, no condenser, and no crossover distortion, may have some different excursions from out to down movements really, but tried it someday.

I also use heavy amplifiers, because i like vibrations in body, feel in the skin and hairs, and sometimes i use this one.

When use this one, i think manking is going wrong way, creating complicated, heavy and worst things. Normally, usually, all the times comparing, no doubts, it beat the best equipments i have heard together speakers.

The best i heard was 1972 Macintosh, a Valve one, not 72 model, older than that, have you seen already something alike shock absorbers used in speaker diafragm, adjustable mini mechanical system?.... i saw it once, was this Macintosh. Maybe this one beat this simple stage.

Not a matter to discuss too much, i think, beeing easy, good to tried.

But i will not dennied the danger you told, off course energy flowing into driver is no good idea.

My unit have less power, and less energy passing, because 150 ohms capsules, i made those, first very dangerous and i told people, depends of the headphone capacity to receive power, and second less dangerous , made this way because the headphones easy to find now a days, cheep and good chinese ones, that can used to test and if damage, a very small money loose, and a very good sound heard.

regards, and thanks your attention and care.

Carlos



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Old 9th June 2004, 10:55 AM   #7
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Default You can also substitute Headphone with a resistor

You can put a resistor in the colector, with a resistance value lower than the resistance of the headphone voice coil, this way, naturally, more energy will pass througth the resistor and less energy will pass througth the headphone coil, this way, less DC power, less AC power in the headphone.

Also can use a big electrolitc condenser, at least 10000uF, to guarantee very low frequency passes to a low impedance charge... with a lot of over capacitance to guarantee. Audio will loose with a condenser, but still very good.

try it!, you will be surprised and will start to think in a different way...more flexible related power.

Carlos
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Old 26th August 2006, 08:32 PM   #8
boxedin is offline boxedin  Canada
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hi carlos,
i want to make simple headphone amplifier for my grado headphone sr80. Does this still work or any better version?.

Thanks
Alex
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Old 26th August 2006, 09:10 PM   #9
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Default This one was the best i have made.

There are many good one..... i think even better ones...but i did not made them..so, i cannot say nothing about other headphone amplifier's qualities.

There are people that only introduce a big emitter resistor, into normall power amplifiers and use it as headphone amplifier...others use only the drivers with big emitter resistors removing the output transistors.

Others (zillions of millions) put a resistor in series in the output of some amplifier and this turns the headphone output.

I cannot say too much about those "zilions".... but i think that if one transistor can make the work..why to use many and finally goes reducing the power in the output....those things do not make too much sense to me.

This one i made... and i can say it sounds great....and this is because one single transistor distort less than many.

Simple things normally sounds great... the opposite is when we create distortions and we go correcting here or there...we first create the mess, and them we go cleaning the house.....

I prefer the simple...reason why JLH old designs are great and many sophisticated amplifiers are hard to listen.

regards,

Carlos
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Old 26th August 2006, 09:39 PM   #10
Nordic is offline Nordic  South Africa
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Hey there uncle Carlos...

I was just looking for something like this for my wife's little shuffle... it has realy nice sound, but it is a little weak power wise...

I have some questions, as I am still rotten when it comes to using transistors... (just fine with IC's though).

Is the connection on the top left the input, and the bottem left the output? (schematic 1)

Could I run 2 of those off a 9V battery?

How would you say it compares to something like an opa134 or other nice opamp for headphone use?
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