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High speed headphone apmlifier
High speed headphone apmlifier
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Old 31st January 2020, 08:36 PM   #1
osscar is offline osscar  Latvia
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Default High speed headphone apmlifier

Hello all,

I have started to build this HPA maybe with built in USB DAC and whammy style CRCRC PSU with 24V regulators (post 82) - List of best DIY Headphone Amplifiers

Also, I have attached my LT spice schematic.
I have a question on how to better match transistors - by pairs as suggested by W. Marshall Leach if its not possible to match all of them? I have various manufacturers BC 550/560 - Fairchild, Philips, ON - but pnp and npn have different Hfe...
q1,q3 - q5,q6 , - q2-q4 ?

thank you!
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File Type: jpg CaptureHPA2.JPG (149.1 KB, 230 views)
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My DIY so far: two Leach amps,two Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, MF A1 Clone, Whammy headphone amp.

Last edited by osscar; 31st January 2020 at 08:38 PM.
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Old 31st January 2020, 08:37 PM   #2
amplidude is offline amplidude  Denmark
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Interesting.
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Old 31st January 2020, 08:47 PM   #3
Mark Johnson is offline Mark Johnson  United States
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High speed headphone apmlifier
My most recent DIY headphone amp has a front panel switch that selects between "low gain" (+8 dB) and "high gain" (+16.3 dB). I find that these settings do a good job covering the range of sources I use, and the range of headphone sensitivities I use.

But the HPA schematic in post #1 appears to have a fixed gain setting of +21 dB. Why so high?
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Old 31st January 2020, 09:00 PM   #4
osscar is offline osscar  Latvia
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good question...I have experimented with class A SE one MOSFET HPA with gain 1 or 0,9x - sounds nice - 2H dominated .
Don't know - I probably like this symmetry and unnecessary complexity - but in this circuit if i increase feedback - i get worse THD numbers in LT Spice.
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My DIY so far: two Leach amps,two Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, MF A1 Clone, Whammy headphone amp.
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Old 15th February 2020, 07:12 PM   #5
osscar is offline osscar  Latvia
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PSU is ready, parts are collected - if i have time for drilling & soldering - hopefully the amplifier board will be ready soon.
Attached Images
File Type: jpg DSC00960.jpg (698.1 KB, 78 views)
__________________
My DIY so far: two Leach amps,two Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, MF A1 Clone, Whammy headphone amp.
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