R4 and R5 spread out the heat so each resistor is below 0.1 W these should be 1/4 W through-hole parts. D3 is there to protect it in case R6 opens. First step is wiring up some power for the HV Module and the Pi, and giving it a test with the multimeter. With the resistors shown, the gate will have approx. It's time to bite the bullet and proceed with the critical stage in this project: Interfacing the Raspberry Pi's 3.3v logic with the 170v power supply in order to officially drive a few of the Nixie Tubes for the first time in this project. In the lower schematic, R3 adjusts the output high time, and R3 adjusts the output low time. In the upper schematic, R2 could be made variable to adjust the overall frequency, with R1 to adjust the duty cycle. Input Voltage (Vin): 5v (Can also work from 12v input) Output Voltage (Vout): 166. Select FETs rated for at least 200 V 300-400 V is better.
They are representative types already in my design library. Note: Do not use the FET part numbers shown. UPDATE: Here is the first pass at a ((concept)) schematic.The parts values are close, but the diodes change the basic 555 equations and I have not run the new numbers. With Q1 rated for at least 300 V (safety margin), it can turn on a p-channel FET that connects the load to the +170 V. If you want to switch the +170 V to the load, that requires one additional transistor. Also, this shows the load being switched to GND. Probably none of the component values are correct for your application, but this shows the concept. Here is a schematic grab from the innergoogle: By adding one or two diodes to the standard 555 circuit, and changing one of the resistors to a pot, you can adjust the duty cycle from 1 to 99 percent -ish.
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