29-06-2013, 04:57 PM
EXPRESS PCB TUTORIAL
EXPRESS PCB.pptx (Size: 1.44 MB / Downloads: 23)
Open ExpressSCH to create a fresh schematic. The first time you start ExpressSCH you will get a dialog box with a link to a quick start guide for ExpressSCH. This can be useful if you want to get a general overview for the tool. Once you are ready to start, close the dialog box to view the empty schematic.
Then click on the schematic for the 4 resistors (not including the photoresistor or potentiometer) in roughly the location you want them to display. Then zoom in using the magnifying glass tool (or the wheel on the mouse) and pan the display (using the sliding bars) to improve your view.
Now you need to give each of the resistors unique identifiers. Right click on a resistor and choose “Set component properties.” In the Component Properties box, under “Component ID,” select “Auto assign Part ID.” The program should assign this resistor to be R1. Set its value 10k in the “Part Name” field and hit OK. Repeat this process to identify and label R2 (10k), R3 (100k), and R4 (10k).
Now add the capacitor, potentiometer, comparator, and transistor to the circuit by first clicking back on the component placement tool (the red op-amp symbol) and using the component names “Passive-Capacitor polarized,” “Passive- Potentiometer,” “IC – National - LM311 – Comparator – DIP-8,” and “Semiconductor – Transistor NPN.” Use “set component properties” to assign all of these parts Part IDs, label them and position them (using the arrow tool) in a logical manner.
Now we need to add some components (the photoresistor and the buzzer) that don’t exist in the library. Let’s start with the photoresistor. The easiest way to make new parts is to start with a symbol that’s already close to what you want and modify it. Place a regular resistor on the layout (using the placement tool with ‘Passive – Resistor’). Go to the selection tool (the arrow), choose that resistor and go to the “Component” menu at the top and select “Ungroup component”