6E2 Cat's Eye Tube Level Indicator Pickup Light DC Power Supply Version

A dual DC-DC solution using MC34063+LM2576S-ADJ.
Note: IRF740 tubes would rather be bought second-hand and dismantled than the so-called genuine ones from stores that sell "domestic small chips, big chips, original Taiwanese products" and so on! ! !
 
2023-06-08 22:23:04 The 3.5mm audio input, which is meaningless and will cause the mixing of left and right channel sounds, has been modified to a 2.54 pin input.
2023-06-16 10:42:03 The original 47K R8 resistor has been modified. It is 27K (if this resistance value is not available, it can be replaced by a similar one).
Please be sure to solder and install all components except the 6E2 tube before powering on for testing.
You need a multimeter to test these two voltages to ensure they are correct before plugging in the 6E2 tube.
(The three potentiometers are responsible for adjusting 250V, 6.3V and microphone sensitivity respectively)  
The verification has been completed, and the pictures and videos were all taken with Pixel 6 Pro high-definition real objects.
Because I was too hasty, the LM2576S-ADJ exploded twice during PCB debugging. Repeated debugging exposed copper on the PCB, and the board was not even washed.
Minor problems as small as silk screen markings have been repaired, and the functions are all normal, so you can safely make boards and imitate them.
I welcome and don’t mind your second revisions and suggestions to me.
 
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In addition, please do not look at the BOM generated at the bottom of the page for all my works, and the schematics are for reference only.
Because I don't have the time to repair the various extended information of the components one by one.
You can export the BOM from the PCB file yourself or buy it against the silk screen.
Be diligent and save a lot of money by buying and welding your own.