UC3843B 12v to 100v DC Booster for Tube\Valve amplifiers. Consider changing the Schottky diode to a higher rated voltage version. Oscillator is running at 75KHz. Output voltage can be increased by changing a single resistor (see note in schematic), this board can be used with nixie tubes. Oscillation frequency can be changed with timing resistor/capacitor change. Video of it in action here: [https://youtu.be/WjKtIpr8MAg](https://youtu.be/WjKtIpr8MAg) Blog: [https://ratti3.blogspot.com/2020/12/designing-and-building-dc-to-dc-high.html](https://ratti3.blogspot.com/2020/12/designing-and-building-dc-to-dc-high.html) Files: [https://github.com/Ratti3/UC3843B-100v-Booster](https://github.com/Ratti3/UC3843B-100v-Booster)