Biomedical Instruments Design 475 BMIS Circuit Design
Introduction A support is used to hold all the parts of the circuit An electronic circuit contains many elements Components Wires (Connexions) A board A Breadboard
Electronic Circuit representation What are the differences between the two representations of the circuit? How many components are there in each representation? How many nodes are there in each representation?
Graphical elements are needed in order to draw circuits An electronic circuit can be represented in many ways Schematic Printed Circuit Board (PCB) Symbols Footprints The same components are drawn differently in each type of representation Electronic Circuit representation
To convert a schematic into a printed circuit board we need: The pin configuration of each component The footprint of each component The value of the current in the circuit’s nodes The desired dimensions of the final circuit
Pin Configuration Example 1 The pin configuration of a transistor
Pin Configuration Example 2 The pin configuration of an IC DIL8 SO8
Copper tracks design (PCB) Question Why there are different widths of the copper tracks in the same PCB? Different current value Different track width
Exercise Using DIL8 footprint for IC1, draw a PCB for this circuit? How many components are there in this circuit? How many nodes are there in each representation?