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Page 1 of 5 (45 items) 1 | 2 | 3 | 4 | 5 | Next >
  • Re: Invisible power pins on opamp fail to connect to global net
    I'm grateful to oldmouldy for clarifying the position. I hadn't appreciated that the netlisters for pspice and PCB editor have such different behaviour (and I may have been thinking of Layout in the past). I have now revised my library so that the power pins are all visible and the symbols work in both applications.
    Posted to PCB Design (Forum) by John Davies on Sun, Mar 13 2011
  • Re: Mismatch between input pins of opamp between Capture and PSpice
    Sorry, I should have made the symptoms clear. The circuit does not behave correctly; a simple amplifier shows positive feedback instead of negative feedback, for instance. It works correctly after the connections to the + and - inputs are reversed in the Capture schematic. Thus the circuit appears to have positive feedback according to the ...
    Posted to PCB Design (Forum) by John Davies on Wed, Mar 2 2011
  • Mismatch between input pins of opamp between Capture and PSpice
    I have a library of opamps that I use for teaching, which includes capture symbols and pspice models. All worked well with release 16.2 but two problems have arisen in 16.3. The second is that the mapping between pins in capture and pspice does not work correctly for some opamps. The two inputs (inverting and noninverting) get mixed up. The ...
    Posted to PCB Design (Forum) by John Davies on Tue, Mar 1 2011
  • Invisible power pins on opamp fail to connect to global net
    I have a library of opamps that I use for teaching, which includes capture symbols and pspice models. All worked well with release 16.2 but two problems have arisen in 16.3. The first is that I hide the power pins using the "Pin Visible" check box in the Pin Properties dialog box. Power is provided through power symbols called V+ and V- ...
    Posted to PCB Design (Forum) by John Davies on Tue, Mar 1 2011
  • Re: procedure for gerber file/plot generation of specific layers - OrCAD PCB editor 16.3
     I have written a tutorial that explains some of these tasks. Please download it from <http://userweb.elec.gla.ac.uk/j/jdavies/orcad/> because it is too large to attach. Page 45 explains how to create gerber files for additional layers.   Good luck! - John Davies
    Posted to PCB Design (Forum) by John Davies on Tue, Sep 28 2010
  • Re: Dynamic shape with solid fill does not plot solid black
    Thanks for the suggestion. We have a "traditional" (i.e. old-fashioned) in-house process for producing PCBs and use the Plot command to produce a photomask directly. I work in a university and this procedure enables us to produce simple PCBs very quickly for students. You're correct, we could write Gerbers and print them instead but ...
    Posted to PCB Design (Forum) by John Davies on Mon, Apr 19 2010
  • Dynamic shape with solid fill does not plot solid black
    We produce photomasks by changing the colors of the desired features to black and using the Plot command. This works well for most of the etch but not for dynamic shapes with solid fills, which print gray instead of black. Connect lines and cross-hatched fills print black but a solid fill does not. The gray is very dark and looks like black in ...
    Posted to PCB Design (Forum) by John Davies on Fri, Apr 16 2010
  • Re: Mounting holes in package symbols
    Thank you both -- it is quite obvious, as you say! I should have looked at the Options panel more carefully. My only (feeble) excuse is that this is not mentioned in algolibdev.
    Posted to PCB Design (Forum) by John Davies on Thu, Feb 18 2010
  • Mounting holes in package symbols
    Is it possible to include non-electrical, mounting holes in a package symbol? For example, a battery holder has two electrical pins plus two holes for screwing it to the PCB. My current fix is to add the mounting holes as vias but I hope there is a better way.
    Posted to PCB Design (Forum) by John Davies on Tue, Feb 16 2010
  • Re: Getting started with Cadence PCB editor
    Here's how to import the files. Create a new board file and choose File > Import > Artwork... from the menu bar ("load photoplot" command, also called "load gerber"). Browse for one of the films that you have downloaded, 05-01726_rev_1.bot say. The dialog box should change to show the correct Format, such as Gerber ...
    Posted to PCB Design (Forum) by John Davies on Thu, Jan 14 2010
Page 1 of 5 (45 items) 1 | 2 | 3 | 4 | 5 | Next >