Nice clock! In my circuit, the USB data lines are not connected to the MCU. Actually, I expect that the negotiation will be done by the FT230X (USB to basic UART IC), maybe I’m wrong. When plugged in, the device should only consume a few mA, I will delay powering on the nixies. For the HV, I use a flyback design with a LT3757 that has a soft-start function, so I don’t expect spikes over 500mA. With the nixies and neons powered on, the device should not consume more than 400 mA. That’s the theory… I will follow your suggestion and use a hub for testing, thanks Jon.
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