Has anyone built the headphone amplifier? ..have any images to share?
What does it cost to build one of these?
What does it cost to build one of these?
Good project.
Will not cost much.
It is standard components.
If you have lot of money
you could waste it on some "exotic" stuff,
like cables for $500
Capacitors for $50, still it will just add capacitance.
Connectors in solid gold, $799.99 - sound is the same, yet
regards
"not a money waster" Groman
like money, if it is mine!!!!!!
Will not cost much.
It is standard components.
If you have lot of money
you could waste it on some "exotic" stuff,
like cables for $500
Capacitors for $50, still it will just add capacitance.
Connectors in solid gold, $799.99 - sound is the same, yet
regards
"not a money waster" Groman
like money, if it is mine!!!!!!
Gomer,
Check out this thread:
http://www.head-fi.org/forums/showthread.php?threadid=8443
There's a link to pictures of the DoZ Headphone amp I built there. I think I estimated cost to be around $80 but I used a lot of surplus components for everything except the PCB components
Check out this thread:
http://www.head-fi.org/forums/showthread.php?threadid=8443
There's a link to pictures of the DoZ Headphone amp I built there. I think I estimated cost to be around $80 but I used a lot of surplus components for everything except the PCB components
Hey Sidney, good to hear your report. It makes an interesting contrast with this one:
Enjoy your amp. I think I may build one too. Sometime.
Paul
See http://www.diyaudio.com/forums/showthread.php?postid=41397&highlight=gah#post41397morsel said:The Doz has a bipolar input, which is much lower impedance than a FET input, and a poor choice. It has capacitively coupled output instead of direct coupled output, a total nightmare for quality audio. The output impedance is too high for low impedance headphones. Real world headphones have impedances ranging from 30 to 600 Ohms. A quiescent current of 330mA, gah. I could go on and on, but basically, it is not a great headphone circuit. If you are insistent on discrete design, at least look at Kevin Gilmore's class a amp.
Enjoy your amp. I think I may build one too. Sometime.
Paul
You can build a fine headphone amp with a single
transistor and about 10 passive components and run
it off a 13.8 volt battery, and it will drive any dynamic
headphone I've seen. No need for 3 gain stages at all.
transistor and about 10 passive components and run
it off a 13.8 volt battery, and it will drive any dynamic
headphone I've seen. No need for 3 gain stages at all.
Hi Paul
Since the headphone amplifier, I've built a full power version DoZ Amp as a cube (basically 12" x 12" x 2" fin natural alum. heatsinks as sides with quality perforated aluminum top with red oak trim and a red oak face plate). Transistors used are the Motorola BC559 equivs, NTE 373 drivers and MJ15003's on the outputs. (IMHO, after much listening and swapping in and out, you should use the 2n3055's on the headphone version and MJ15003's on the full power version for the best sonics). Also has dual matched cap multipliers. Power supplies for both were oversized.
I won't comment on technical interpretations of suspected design shortcomings of this type of amp, all I know is I am extremely pleased with both versions I've built. I recently got my speaker placement just right and when my wife looked into the room I was sitting there with a grin from ear to ear! It's just a great sounding amp!
Since the headphone amplifier, I've built a full power version DoZ Amp as a cube (basically 12" x 12" x 2" fin natural alum. heatsinks as sides with quality perforated aluminum top with red oak trim and a red oak face plate). Transistors used are the Motorola BC559 equivs, NTE 373 drivers and MJ15003's on the outputs. (IMHO, after much listening and swapping in and out, you should use the 2n3055's on the headphone version and MJ15003's on the full power version for the best sonics). Also has dual matched cap multipliers. Power supplies for both were oversized.
I won't comment on technical interpretations of suspected design shortcomings of this type of amp, all I know is I am extremely pleased with both versions I've built. I recently got my speaker placement just right and when my wife looked into the room I was sitting there with a grin from ear to ear! It's just a great sounding amp!
You are right Nelson
The voltage gain needed for a headphone
driving circuit is not high.
This is even more true for low impedance Headphones.
They need a little more current.
An alternative to consider is a high quality OPamp
for raising the voltage somewhat, followed
by a buffer to deliver enough current.
The buffer may be included in feedback of
circuit or not.
Many different solutions work alright.
If you want to use an output capacitor
put the money there.
My choice would be OSCON, parallelled if needing
low roll off.
The high quality Sennheisers have 300 and 600 ohms impedance.
Need not so much current 50mA is enough.
6-12 dB voltage gain is alright,
depends a little on what kind of music-recordings
you listen to.
See this thread of discussion of a low power buffer.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=2744
groman
The voltage gain needed for a headphone
driving circuit is not high.
This is even more true for low impedance Headphones.
They need a little more current.
An alternative to consider is a high quality OPamp
for raising the voltage somewhat, followed
by a buffer to deliver enough current.
The buffer may be included in feedback of
circuit or not.
Many different solutions work alright.
If you want to use an output capacitor
put the money there.
My choice would be OSCON, parallelled if needing
low roll off.
The high quality Sennheisers have 300 and 600 ohms impedance.
Need not so much current 50mA is enough.
6-12 dB voltage gain is alright,
depends a little on what kind of music-recordings
you listen to.
See this thread of discussion of a low power buffer.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=2744
groman
Groman,
Your writing style is nearly poetic. Have you considered
posting your comments solely in Haiku? 🙂
Your writing style is nearly poetic. Have you considered
posting your comments solely in Haiku? 🙂
I have my way.
Glad if you think it is amusing in any way!
I have had thoughts on writing a book, sometime.
I like expressing myself in writing.
It fullfill creative needs.
so does constructing designing amplifiers, too.
groman
likes to be creative
Glad if you think it is amusing in any way!
I have had thoughts on writing a book, sometime.
I like expressing myself in writing.
It fullfill creative needs.
so does constructing designing amplifiers, too.
groman
likes to be creative
You can build a fine headphone amp with a single
transistor and about 10 passive components and run
it off a 13.8 volt battery, and it will drive any dynamic
headphone I've seen. No need for 3 gain stages at all.
Bump of the ages
Papa don't preach
Bestow upon us what you teach
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