PCB has arrived!

The nixie clock's main board that I ordered last time has arrived. (Delivery was faster than I thought ;D )

I ordered ceramic capacitors and several types of 3216 type resistors needed for PCB assembly.

Since the 0.1uF ceramic capacitors were rather expensive, I purchased tantalum capacitors instead.

Because the tantalum capacitors have polarity, I have to mark polarity with a marker pen on the PCB while checking the brd file.

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LM2575 SMPS test

I hate the linear constant voltage IC very much ( For example, 78xx series)

They are difficult to deal with the heat issue. SMPS, however, generates little heat.

I made reference circuit of LM2575 5V.

It generates almost exactly 5V when 12V input is applied.