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True, but he only wants to drive earphones, doesn't he?John Fields wrote:
On Sun, 03 Aug 2008 13:04:52 -0700, Tim Wescott <tim@seemywebsite.com
wrote:
Dave.H wrote:
I want to build a headphone amp to connect to my laptop's audio
output, and thought a tube based one would be a nice change from all
the IC driven ones I've built in the past. I would prefer a simple one
with low cost components, and low voltage operation, if possible, and
no more than 3 tubes. Any tube type will do.
Thanks
Dave
Australia
If you define "low voltage" as "a lot lower than what an 807 wants" then
there are plenty of projects.
If you define "low voltage" as "won't kill me" then there are a few, but
sound quality and power output will suffer a lot.
If you define "low voltage" as "runs off of a 12V rail" then there
really aren't any at all.
---
12AD6, 12AE6A, 12AF6, 12BL6, 12EK6, 12F8...
JF
IIRC those are all for signal processing and are exceedingly wimpy,
requiring you to implement the audio output stage with germanium
transistors.
I have a stepdown transformer to run my Zenith tube radio. If IDave.H wrote:
On 4 Aug, 06:04, Tim Wescott <t...@seemywebsite.com> wrote:
Dave.H wrote:
I want to build a headphone amp to connect to my laptop's audio
output, and thought a tube based one would be a nice change from all
the IC driven ones I've built in the past. I would prefer a simple one
with low cost components, and low voltage operation, if possible, and
no more than 3 tubes. Any tube type will do.
Thanks
Dave
Australia
If you define "low voltage" as "a lot lower than what an 807 wants" then
there are plenty of projects.
If you define "low voltage" as "won't kill me" then there are a few, but
sound quality and power output will suffer a lot.
If you define "low voltage" as "runs off of a 12V rail" then there
really aren't any at all.
A 6V6 or 6AQ5 wants around 250V and will function down to 100V or so at
reduced output, should power headphones nicely (I dunno, I haven't done
it, but it's like one of the World's Most Popular Tubes), and 250V won't
kill you instantly if you do something stupid.
250V will make your heart go "rumpity-thump" for a minute or two instead
of "lub-dub", but it'll only kill you if you hang on for a while.
So keep one hand in your pocket any time the circuit's powered up, and
have fun.
I have _never_ been shocked by a piece of tube equipment. AC mains,
yes. Telephone lines, yes (you have to jam the wires into your finger
to do this, but man it hurts when you do). Ringing telephone lines, yes.
But never tube equipment.
--
Tim Wescott
Wescott Design Serviceshttp://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details athttp://www.wescottdesign.com/actfes/actfes.html
By "low volltage" I meant any voltage below 160v.
Dave
Australia
I suspect that any circuit that works up to 300V will work at reduced
power at 160V.
I found a bunch of OTL circuits on the web. The authors thought they
were cool because once you've got an OTL amplifier you're just one LN2
dip away from audiophile nirvana -- I think they're cool because you
don't need to spring for an expensive audio amplifier for each channel.
--
Tim Wescott
Wescott Design Serviceshttp://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says..
See details athttp://www.wescottdesign.com/actfes/actfes.html