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Title: Looking for voltage control amplier circuit Post by: Epegic on April 18, 2008, 08:35:07 08:35 Hi,
Are there any simple circuit using ordinary op-amp or transistores whose gain is proportional to control voltage applied. Thanks, Title: Re: Looking for voltage control amplier circuit Post by: aProgrammer on April 18, 2008, 10:48:39 10:48 A more easy way is to use an OTA
like CA3080, LM3080, NE5517, LM13600 or LM13700, BA6110, CA3280... Title: Re: Looking for voltage control amplier circuit Post by: hugo on April 19, 2008, 02:32:56 02:32 Microchip has some digitally controlled VGAs , they are very good and easy to use.
Title: Re: Looking for voltage control amplier circuit Post by: ar3000a on May 08, 2008, 06:47:46 06:47 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 Title: Re: Looking for voltage control amplier circuit Post by: Epegic on August 10, 2008, 03:30:20 03:30 "Use a FET to replace the feedbak resistor,One op-amp circuit can be voltage-controled."
ar2000a, please suggest some circuits. Title: Re: Looking for voltage control amplier circuit Post by: arash_tah on August 10, 2008, 05:07:20 05:07 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 Title: Re: Looking for voltage control amplier circuit Post by: beque on August 11, 2008, 04:35:22 16:35 Use this
http://www.analog.com/static/imported-files/data_sheets/AD633.pdf It Works fine ! |