commercial high-power transconductance amplifier!

[taloyd]

Hello,

I was browsing through the Marchand Electronics page, and I stumbled on this... definitely looks like a high-power transconductance amplifier, and Marchand is an excellent company in regards to electronics.

$950

http://www.marchandelec.com/cl54.html

Would be fun to use with subwoofers as would bypass the issue of thermal compression and other non-linearities...

cheers,

-tal

 

[tade]

what is transconductance?

 

[rnrss]

Hello,


Would be fun to use with subwoofers as would bypass the issue of thermal compression and other non-linearities...

cheers,

-tal

Actually CCS amp add other nonlinearities, overshoot duu to no damping... see my post

http://www.diyaudio.com/forums/showthread.php?s=&threadid=60895&perpage=10&pagenumber=63

what is transconductance?

constant current source rather than constant voltage

 

[jh6you]

Constant current source . . . ? ? ?

My understanding is . . .
Transconductance amplifier (current amplifier) means that output current is proportional to input voltage while voltage amplifier means that output voltage is proportional to input voltage . . .


Regards
jH

 

[tade]

of what benefit is variable current to me, the humble listener?

thanks

 

[jh6you]

Hmm . . .
I do not know why I can't connect . . .
Probably u could do . . .
www.firstwatt.com
Full info there . . .


Regards
jH

 

[rnrss]

Constant current source . . . ? ? ?

My understanding is . . .
Transconductance amplifier (current amplifier) means that output current is proportional to input voltage while voltage amplifier means that output voltage is proportional to input voltage . . .


Regards
jH

Your understanding is correct... and it is called a ccs for that reason... The important thing I would point out to you however is that these amps have little or no damping and damping is what stops or reverses a speaker according to the signal put into it to prevent overshooting...

I did a couple of rather crude writeups on this if you woud like to see them, just beware of the elitest hype...

 

[jh6you]

If you say "current source", then you are right . . .
If you say "constant current source", I'm confused . . .
Probably, you are confused . . .
Output impedamce is, yes, high . . .


Regards
jH

 

[planet10]

Re: Re: commercial high-power transconductance amplifier!

Actually CCS amp add other nonlinearities, overshoot duu to no damping...

This is only true if the speaker unit has inadequate internal damping -- which describes most speakers available. Fortunately there are some very good drivers with adequate mechanical damping that work best with CCS amps.

dave

 

[Variac]

I would request that we don't turn this into another discussion of Damping Factor. I think everyone has had his or her say on the subject...

 

[jh6you]

Ayo . . .
Some know one and insist all . . .
Unicellularrrrrr . . .


Regards
jH