All Forums  Electronics  Other Circuits  Passing the source current to the output

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by rahdirs[/i] [br]The source V1 that you see in the schematic is a varying voltage source,it's voltage varies randomly from 3.3 V to 18 V (slowly,no issue of frequency). In the circuit, using the two op-amps & 18 V voltage source i brought the voltage to an almost constant 16-17 V.But the op-amps give small current(25 mA),so i used a power-amplifier to increase current. But what i'm talking about in previous post is that the source V1 is not only a varying voltage source,but it also gives current in-between 4-7 A.I want to bring this current, to the base of the power-amp,so that i can use this current & decrease the current i draw from Vcc. What i want to do finally,is to bring voltage at the o/p of the 2nd op-amp to 16-17 V which i did & also the current to 4-7 A. I mean,like the way you do in a trans-impedance amplifier(not talking about current to voltage conversion) pass the current through the feedback paths with probe 1&probe 2 through probe 3 to output,can i make current to flow this way ??? Am I making myself clear????? I mean now if the current were to pass through the paths with probe 1 & probe 2,then because of low-output impedance of op-amp the current flows into the output of the op-amp,rather than going forward.So i'm thinking of increasing op-amp output impedance so that current from the feedback path doesn't flow into it.Is this correct?? [b]Download Attachment:[/b] [url="./uploaded/rahdirs/2013650234_Capture 1 .JPG"][img]./icon_paperclip.gif[/img] Capture (1).JPG[/url][br]184.3 KB [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.