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Information on voltage controlled amplifier
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Topic: Information on voltage controlled amplifier (Read 3569 times)
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vaualbus
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Information on voltage controlled amplifier
«
on:
November 25, 2013, 05:56:27 pm »
In relation to my old post about the project of making a fully digital function generator withoth using a digital signal sysntetizer chip (I can't use it because I don't want smd component), I have solved the problem of the VCO and the waves generation. Now I have the folowwing problem how I make a amplifier that control the amplitude based on a given voltages( via the dac control by the microprocessor)?
Any one have some ideas?
By the wave the frequency range that the vco use if 1Hz to 1Mhz.
Best regards, Alberto.
«
Last Edit: November 25, 2013, 05:59:00 pm by vaualbus
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Marco
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Re: Information on voltage controlled amplifier
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Reply #1 on:
November 25, 2013, 06:40:55 pm »
How linear does it have to be? Would a JFET based VCA like this do :
http://electronicdesign.com/analog/op-amp-and-two-jfets-form-voltage-controlled-amplifier
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sub
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Re: Information on voltage controlled amplifier
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Reply #2 on:
November 28, 2013, 09:52:58 pm »
You could use a multiplying dac, e.g. DAC8043A. This comes in DIP.
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Rerouter
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Question Everything... Except This Statement
Re: Information on voltage controlled amplifier
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Reply #3 on:
January 31, 2014, 01:39:56 am »
Though it looks less professional, you can use an AD9850 module or similar if you want to avoid SMD, its cheaper than the chip itself and is presented in a dip like package (little board with 2 pin rows,)
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