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Grouping opamps in to a single DIP package
2015 5
olicomber 8 years ago
Hi there, I'm very new to EasyEDA - but I'm finding it nice and easy and fast to use so far. Thanks for a great bit of software. I'm also very new to electronics. Anyway, excuses out of the way... I'm trying to build a preamp module with a bit of gain and isolated outputs so that a single low power source of any quality (phone, tablet, Pi) can drive multiple poweramp modules right up to their 3.6v p-p limit. So far, I've designed and tested a single channel of the circuit and am happy with the values and the response. So my next step is to generate a PCB. I'm aiming to do as little "manual work" as possible to step the design from the single channel /tested/ version to a dual channel PCB version to minimise errors. But I've got a little stuck. Where I have been using the standard TL081 symbol - 4 of them - I'd like to produce a PCB which uses a single TL084. But I'd like to do this without the possibility of errors introduced from manually unwiring the current symbols and wiring in the actual DIP14 package. And from what I've found so far, I can't produce a testable schematic using the DIP14 for the various TL084s I've found under "More Libraries". So what I was hoping to do now is convince EasyEDA that my 4 separate opamps on my schematic belong to the same DIP (using different pins, of course), and have it automatically produce a PCB based around a single chip. Is this possible? Or is there a better way I should tackle this problem? - perhaps I need some pointers on how to build a testable circuit based around the TL084? My tested, single channel schematic is here: https://easyeda.com/editor#id=kTfPNnligQ And the full version I've carefully put together from it which is causing me this problem is here: https://easyeda.com/editor#id=QK2keTb5n3 Many, many thanks in advance for any help offered! :-) Thanks, -Oli
Comments
support 8 years ago
DIp is not a valid package, please check https://easyeda.com/Doc/Tutorial/schematic.htm#Update-Package out how to set package. BTW, your schematic is private, we can't check it out.
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support 8 years ago
>my 4 separate opamps You need to use https://easyeda.com/Doc/Tutorial/creatingtheSchematicLibs.htm#Subparts subpart connect with U1.1 U1.2 U1.3 U1.4 you can use `More libs`, try to find LM324.
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andyfierman 8 years ago
Hi Olicomber, Welcome to EasyEDA. Minor problem: you need to make the project containing your schematics public so that we can see them to advise. Question: are you drawing a "passive" or non-simulation schematic or are you drawing an "active" simulatable schematic? * If you are creating a "passive" or non-simulation schematic then: You can either use a simple 14 pin symbol for the TL084 or create a schematic symbol for a multi-part packaged device. How to createschematic symbols for multiple packaged devices: https://easyeda.com/Doc/Tutorial/schematic.htm#Multi-part-Components https://easyeda.com/Doc/Tutorial/creatingtheSchematicLibs.htm#Subparts Another option that makes the supply pins a separate little block to clarify device decoupling is shown in: https://easyeda.com/example/Tesseract_Guitar_Practice_Amp-MjP71jBni The symbol for this is here: https://easyeda.com/example/component/TL084N-PHc60iASM?from=editor * If you are creating an "active" simulatable schematic then: Suppose you have two TL084 packages in your circuit. Simply place the single opamp part symbols in your schematic as yu have already and then just number them like this: U1.1, U1.2, U1.3 and U1.4 Then for each part of U1, press the `i` key and edit the pin numbering and/or naming to match the package pinout then copy and paste them to create: U2.1, U2.2, U2.3 and U2.4 Note that if you name the supply pins on the symbol to be the same as the netlables on the supply nets then you can hide the power supply pins to make the schematic clearer.
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olicomber 8 years ago
Hi guys, Thank you so much for all the pointers - I'll do some reading on subparts and see if I can get this one cracked :-) Andy - I started off with a subset of the circuit which I could simulate, and when I was happy that it worked I then cloned it and partially rewired the inputs and outputs to give me two channels and the necessary connectors ready to generate a PCB. Support - sorry, I have now made both projects public. Thanks again :-) -Oli
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olicomber 8 years ago
That did the job! - renamed to 1.1, 1.2... changed the pins to match the datasheet and it "just worked" - superb. Thanks again :-) -Oli
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