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25th April 2005, 12:04 PM
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#1 |
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diyAudio Member
Join Date: Jan 2003
Location: Milwaukee, WI
 
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My new headphones amp
Hello, and welcome to one more of my sparing posts to the SS forum...
 Breadboarded this just this morning: two transistors per channel, pre-amp (grounded emitter) with 50mA-biased follower. Cap coupled input and output (OMFG, LYTICZZZ!!!!!!111). Haven't bothered with measurements but it seems to deafen me nicely. Power source is the +12V inside the computer, which is rather dirty - in case anyone was wondering - so I had to filter it a bit. Really needs a choke, there's some 120Hz residual in there yet. The connector is kind of short so the breadboard has to ride up on the computer somewhat...  Sounds good, SFA linearity as far as I can tell. Much more bass than my tube preamp, but that's not saying much since it has a 500 ohm output impedance (maybe 5mA peak output) into these 32 ohm phones! Tim
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See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!" |
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25th April 2005, 12:13 PM
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#2 |
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diyAudio Member
Join Date: Jan 2003
Location: Milwaukee, WI
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Schematic.
Oh, and there's a 0.1uF ceramic on the power supply rail too. Common rail for both channels. Tim
__________________
See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!" |
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