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Speaker amps for headphones - Page 143

post #2131 of 3116
Quote:
Originally Posted by ALRAINBOW View Post

Lmao. I new it . God bless you man , youth if only had some of that now.

Al. D

:beerchug: 

 

EDIT: I also come from a family that has 4 generations of Engineers. I somehow missed the Engineering bug, but I am a tinkerer at heart. You should see my Uncle's place my goodness! He easily has $100k in tools in a 2,000 sq. ft. "garage" he built out in the country with ponds, trails and everything. He owns an engineering business that specializes in structural design. My Grandpa pioneered the way with laser-cutting various fabrics and taught the Japanese, he was a VP of a shoe company that rivaled Nike back in the day. The list goes on...lol


Edited by brunk - 1/2/14 at 9:03pm
post #2132 of 3116

I was playing around with the new scope and created these captures for my How Guitar Tube Amps Work webpage. This scope rocks

Guitar AC Voltage Audio Signal

e_E_combo.bmp

Fender Stratocaster connected directly to an oscilloscope. The high E open string on the left measures +12 millivolts to -12 millivolts peak-to-peak. The tight wave spacing is an indication of frequency and pitch. The wave height (amplitude) is an indication of loudness. The high open E + low open E strings' signal on the right measures +70 to -70 millivolts peak-to-peak. They are a summation of the two strings' signals combined into a complex wave.

 

Low E string alone:

post #2133 of 3116

Very cool Rob :D

post #2134 of 3116

That's it!  I'm going to get one, too!  I'll set it up next to my soldering station!  

 

(Inside joke for brunk)

 

:-)

 

Mike

post #2135 of 3116
Quote:
Originally Posted by zilch0md View Post
 

That's it!  I'm going to get one, too!  I'll set it up next to my soldering station!  

 

(Inside joke for brunk)

 

:-)

 

Mike

Hehe! That's the spirit Mike, you know...that chicken has been thawing out for a long time. I think it's time for a BBQ :wink_face:

post #2136 of 3116
Quote:
Originally Posted by brunk View Post
 

Hehe! That's the spirit Mike, you know...that chicken has been thawing out for a long time. I think it's time for a BBQ :wink_face:

 

I've soldered some battery leads with my new soldering station, but the chicken is alive and well!  Any day now...  

post #2137 of 3116
Quote:
Originally Posted by zilch0md View Post
 

 

I've soldered some battery leads with my new soldering station, but the chicken is alive and well!  Any day now...  

There you go! I'd say if you got a half hour to spare, dig out some old piece of electronic junk lying around the house, dumpster, or GoodWill store and hack it apart with your iron. You'll be a pro in no time, and it cost you nothing but your time.

 

Watch this 3-part series on soldering to cut down on the learning curve drastically too :)

http://www.youtube.com/watch?v=J5Sb21qbpEQ

 

Cheers,

Brunk

post #2138 of 3116
Hi guys,
I am new here, and have some question for good understanding of speaker amps.
Is speaker amplifier basically a voltage source?
For example, 150 watt amp will generate 4.3 amps across 8 ohms of speaker, and generates 35 volts over speaker terminals.
This means that regardless of the load, 150 watt amp will produce 35 volts if it has small enough intenal impedance?
Then headphone like He-6 cannot be danaged whenever it endures 35 volts?
thanks
post #2139 of 3116
Quote:
Originally Posted by Joong View Post

Hi guys,
I am new here, and have some question for good understanding of speaker amps.
Is speaker amplifier basically a voltage source?
For example, 150 watt amp will generate 4.3 amps across 8 ohms of speaker, and generates 35 volts over speaker terminals.
This means that regardless of the load, 150 watt amp will produce 35 volts if it has small enough intenal impedance?
Then headphone like He-6 cannot be danaged whenever it endures 35 volts?
thanks

At full volume a 150 watt per channel amp probably will damage even the power hungry HE-6. As long as you don't turn up the volume too much even a big speaker amp will work with headphones.

post #2140 of 3116
Maybe 50 watt 20 ohm resister will protect He-6?
thank you for the reply.
post #2141 of 3116
20 watts is fine . And I have ten wTts they get a little hot but don't burn out . You can take two ten watt resisters in parallel. To achieve 20 watts. Double the resistance you want .
post #2142 of 3116
Quote:
Originally Posted by Joong View Post

Hi guys,
I am new here, and have some question for good understanding of speaker amps.
Is speaker amplifier basically a voltage source?
For example, 150 watt amp will generate 4.3 amps across 8 ohms of speaker, and generates 35 volts over speaker terminals.
This means that regardless of the load, 150 watt amp will produce 35 volts if it has small enough intenal impedance?
Then headphone like He-6 cannot be danaged whenever it endures 35 volts?
thanks

 

Yes, a speaker amplifier is basically a voltage source.

Obviously some speaker amps will have a higher output impedance than other amps.

For example, tube power amps typically have a higher output impedance than SS power amps.

 

So what you say is basically correct:

Let's assume the output impedance is very low

The 150 Watt amp will produce 35 volts AT FULL OUTPUT into the HE-6.

 

You can connect the HE-6 directly across the output terminals of the power amp,

BUT:

watch the volume!

this IS enough voltage to destroy the HE-6 'phones!

If you set the volume to a comfortable listening level, the hiss (thermal noise) from the power amp may be too high, as the amp was designed to drive speakers, not headphones.

 

P.S.

Someone will pipe up and say that there are a handful of power amp designs that are actually current sources.

OK, but these are pretty rare. 

post #2143 of 3116
Quote:
Originally Posted by brunk View Post

 

Watch this 3-part series on soldering to cut down on the learning curve drastically too :)

http://www.youtube.com/watch?v=J5Sb21qbpEQ

 

Cheers,

Brunk

I consider myself pretty good with a soldering iron but I watched all 3 of these excellent videos and learned a lot of useful tips. Thanks for the link.

post #2144 of 3116
Quote:
Originally Posted by robrob View Post
 

I consider myself pretty good with a soldering iron but I watched all 3 of these excellent videos and learned a lot of useful tips. Thanks for the link.

Yeah, it's all about the technique and a decent tip, flux, and solder. Not much else to it!

post #2145 of 3116
Its scary to someone who does not know. . They most likely overheat the boards and it goes down hill from there . Im sure we have done that right guys ?

But the tip is paramount , and few have a clue to that. I do hi temp quick solder jobs on RC stuff. 10 or 8 gauge attached to a tiny tip. It needs to be done quick and very hot . Both sides tinned of course.

Al. D
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