Voltage of 220V to the transformer via the power switch with built-in fluorescent light. Output voltage of 40V transformer has a improved and filtered after reaching approx. 57V. 100nF capacitors improve the performance of the source against the ripple. LM317 chip in a high voltage is responsible for regulating the output voltage through the resistor divider formed by resistor 220 ohm and potentiometer adjustments (which must be multi-turn). 10μF capacitor in the regulatory lines prevents fluctuations of regulation while the 1N5404 diode prevents the capacitor discharge that can damage integrated circuits. Two output capacitors are responsible for adequately filter the resulting voltage.
