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amplifier with 30vrms output

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amin5659

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Hi. i need an amplifier circuit with gain 3 or above which is capable of producing 30V rms in its output.
BW is from 0.1Hz to 100Khz. maximum output current is 425 mA and output impedance is 100ohm.
input: sin wave with maximum amplitude of 10v rms.
output: sin wave with maximum of 30V rms.
can you help me out?
do i have to use discrete transistor?!
 

Hrad to find integrated amplifier for this, +-84V supply tolerance is unique. Analog Devices have some OPAmps as I remember which can tolerate +-100V supply maybe.
But from discrete devices with lower gains not too hard task maybe. How much is the load capacitance, inductance?
 
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thanks for reply.
Hrad to find integrated amplifier for this, +-84V supply tolerance is uniqe
Click to expand...
why +-84? this would be 60vrms...
How much is the load capacitance, inductance?
Click to expand...
low enough for specified B.W...
this is not an crucial factor for me
can you suggest a PDF or book for such a purpose...?
 

amin5659 said:
why +-84? this would be 60vrms...
Click to expand...
Sorry, you said 30Vrms at the output. The amplitude is 42.4V, which is 84.8 peak to peak. So it is +-42.4V, most of commercial OPAmps cannot handle this supply value. I would also recommend an audio power amplifier, google for it, there is a lot on the web.
 

Sanken also makes high power audio modules.

If this is "for reals", you might also consider a Class D
solution as 30VRMS into 8 ohms or lower, is gonna be
a sweet little heater if you want to stick with linear
amplifiers.
 

Hi,

Class D audio amplifiers with 100kHz bandwidth are hard to find.
And as the OP states the load impedance is 100 Ohms, not 8 Ohms.

Klaus
 

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