| 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 |
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| tade |
| what is transconductance? |
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| rnrss |
| quote: | Originally posted by taloyd
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/show...0&pagenumber=63
| quote: | Originally posted by tade
what is transconductance? |
constant current source rather than constant voltage |
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| 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 |
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| tade |
of what benefit is variable current to me, the humble listener?
thanks |
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| jh6you |
Hmm . . .
I do not know why I can't connect . . .
Probably u could do . . .
www.firstwatt.com
Full info there . . .
Regards
jH |
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| rnrss |
| quote: | Originally posted by 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 |
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... |
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| 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 |
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| planet10 |
| quote: | Originally posted by rnrss
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 |
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| 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...
:cop: |
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| jh6you |
Ayo . . .
Some know one and insist all . . .
Unicellularrrrrr . . .
Regards
jH |
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