This video shows both a working analog voltmeter and a working power supply. We acquired this P.S. for 24 dollars off of ebay, so we were unsure whether or not it would be suitable for our purposes. The power supply takes a 24 volt DC input and outputs a high voltage DC, but an external circuit is required to control the output voltage. A potentiometer is used to scale the output voltage with a 1:1000 ratio. When I turn the potentiometer, I change the resistance and thereby change the voltage that enters the power supply's control circuit. When the resistance is high (max 5k ohm) the voltage is 0, and the high voltage output is 0. Inversely, if the resistance is low, the voltage is 15 volts, and the high voltage output is 15kv.
The analog voltmeter runs off of lower voltage than the high voltage output, and therefore, ten 1Mohm and one 10k ohm resistors are strung together in series from the positive side of the high voltage output. The meter reads the voltage across the 10k ohm resistor by powering an electromagnet that moves the needle accordingly.
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