In this blog post we will describe a simple TL494 based voltage converter circuit, which is suitable for powering a preamp tube or Nixie tube.
Very briefly about its operation: it is a switching circuit that generates a higher voltage from a low voltage and can be varied within wide limits.
For a 12v supply voltage, it is between 80V and 300V. The desired voltage can be adjusted using the RV1 trimmer potentiometer.
We will not go into more detail because there are many articles about it on the internet. You can find great and extensive descriptions at these links:
or here:
https://electrobuff.blogspot.com/2024/03/tl494-voltage-booster-dc-dc-step-up.html
Warning!
This circuit produces dangerously high voltage. The voltage at the output can cause severe electric shock, burns or even death. Work with it only with proper knowledge, safety precautions and appropriate protective equipment. Capacitors can retain a dangerous charge for a long time after switching off – always check and discharge them! The author assumes no responsibility for any accidents or damage.