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Old 18th January 2013, 04:35 PM   #1
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Default Inverting headphone buffer class A

Hi,

I would like to develop inverting headphone buffer which will be used with inverting tube preamp. Tube preamp will have 300 to 600 ohm output impedance (not sure yet about tubes I will use) and 10mA current drive capacity.

I attach schematics of the output buffer I would like to use. In simulation (TINA), voltages and currents seems to be fine (250mA bias current). But I donīt know if I need any compensation because of negative feedback employed.


Thanks.
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File Type: jpg HYBRID HEADPHONE.JPG (36.1 KB, 118 views)
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Old 18th January 2013, 04:46 PM   #2
jcx is offline jcx  United States
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what headphones is always the 1st question - they range over orders of magnitude in Z, sensitivity - no universal headphone amp is practical even restricting to "dynamic" wire and magnet types
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Old 18th January 2013, 05:17 PM   #3
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I will be using headphones from 32 Ohm to 120 Ohm.
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Old 18th January 2013, 05:42 PM   #4
jcx is offline jcx  United States
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that still leaves the possibility of having 130 dB to 83 dB sensitivity - could blast your ears with 200 mV, or hiss horribly, clip dynamic peaks at even 80 dB spl ave level - all depending on which specific headphone and the amp gain, op amp noise, I,V output capability
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Old 18th January 2013, 05:58 PM   #5
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Headphones will be ordinary ones with about 100dB of sensitivity.
Tube preamp will have about 20dB of gain (ECC88), which is quite a lot, but donīt know or have other lower gain tube (donīt want to use ECC82).

Do you think buffer looks good?
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Old 18th January 2013, 06:31 PM   #6
Telstar is offline Telstar  Italy
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FYI there is a specific forum for headphones and related amps
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"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 18th January 2013, 06:56 PM   #7
knutn is offline knutn  Norway
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If I were you, I would remove R7 and R8.
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