This is a video of the same raster scan circuit with a potentiometer integrated in place of a fixed resistor between positive and source of the PNP transistor. Pot. is a 5k ohm logarithmic variable resistor. It will be replaced by a 5k ohm linear pot, and the capacitor will be replaced with a lower rated cap to allow for higher frequencies (more bandwidth).
*Sorry for making you tilt your head*
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