A raster scan generator uses a 555 timer microchip alongside a transistor, capacitor and resistor circuit in order to produce a linear ramp-up oscillation. This type of oscillation will be used to display the SEM image onto an analog oscilloscope screen.
Breadboard of a 555 timer-based linear ramp circuit. In order to make this variable, a variable resistor will replace one of the fixed resistors.
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