Driving the board with an ESP32 and 3.3v #1
Description
Hi,
In one of my projects I needed to drive the board using an esp32. As the esp32 has 3.3v pwm, I had to adapt your board a little. In case anyone else is interested and has the same challenge: just replace the 220R resistors with something smaller like 150-180R (I found I needed to play around a bit - seems to depend on the individual tube) and the 4,7K resistors with 2,2K in the BOM.
To drive 4 tubes t I copied the tube driving circuit with the MJE340 on a prototype board and just used the 150v power supply output. Is there a way to improve power output for the DC converter circuit on your board ? I could not drive 4 IN-9 with one of your boards, I needed two ...
Lars