Author Topic: Modifying a Class A amplifier design for more gain  (Read 1370 times)

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Offline AlessandroAU

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Modifying a Class A amplifier design for more gain
« on: February 27, 2015, 12:01:15 pm »
Hi all,

I've built this small circuit and am using it as a microphone preamplifier:

http://sound.westhost.com/p13_fig2.gif

source: http://sound.westhost.com/project13.htm

It has a maximum gain of about 30dB. Would be feasible to increase the gain to around 50dB by adjusting values with the existing circuit topology or would a different design be required?
 

Offline T3sl4co1l

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Re: Modifying a Class A amplifier design for more gain
« Reply #1 on: February 27, 2015, 12:49:38 pm »
Different design.  Or cascade more.

Trying to obtain much higher gain from a simple amplifier will also see your bandwidth shrink.  Better to use more stages of less gain.

Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
Bringing a project to life?  Send me a message!
 

Offline German_EE

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Re: Modifying a Class A amplifier design for more gain
« Reply #2 on: February 27, 2015, 04:44:21 pm »
Rod Elliott knows what he's doing when it comes to audio design and I would be very reluctant to change any of the component values. Also, think of this, a gain of 50dB is about a x316 voltage gain which is a lot for one stage. Best to cascade them.
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

Warren Buffett
 

Offline Zero999

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