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Author Topic: Looking for voltage control amplier circuit  (Read 1270 times)
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Epegic
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« on: April 18, 2008, 09:35:07 09:35 »

Hi,

Are there any simple circuit using ordinary op-amp or transistores whose gain is proportional to control voltage applied.

Thanks,
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aProgrammer
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« Reply #1 on: April 18, 2008, 11:48:39 11:48 »

A more easy way is to use an OTA
like CA3080, LM3080, NE5517, LM13600 or LM13700, BA6110, CA3280...
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hugo
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« Reply #2 on: April 19, 2008, 03:32:56 03:32 »

Microchip has some digitally controlled VGAs , they are very good and easy to use.
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ar3000a
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« Reply #3 on: May 08, 2008, 07:47:46 07:47 »

Use a FET to replace the feedbak resistor,One op-amp circuit can be voltage-controled.

Posted on: May 08, 2008, 07:41:59 07:41 - Automerged

Or a DAC can do it well.http://2008sfile.ic37.com/2008file/tech/2008-2-10/0210200145_10931_1.jpg
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Epegic
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« Reply #4 on: August 10, 2008, 04:30:20 04:30 »

"Use a FET to replace the feedbak resistor,One op-amp circuit can be voltage-controled."

ar2000a, please suggest some circuits.

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arash_tah
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« Reply #5 on: August 10, 2008, 06:07:20 06:07 »

Hi all
I see what u want
The best thing is using an analog multiplier u can apply your signal to one pin and your control signal to another pin the output will be the multiplicatrion of bouth signal
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beque
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« Reply #6 on: August 11, 2008, 05:35:22 17:35 »

Use this

http://www.analog.com/static/imported-files/data_sheets/AD633.pdf

It Works fine !
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