The most sensible low-cost direct drive arrangement in terms of parts count
and board layout is SOIC 74HC595 shift registers and SN75468 HV driver
arrays.
There's a Chinese Zirrfa 6 digit clock board that uses this approach.
On Mon, Aug 15, 2022, 7:09 AM David Pye wrote:
> Given the price of
Given the price of these custom drivers, I wonder whether some cheap arm
microcontrollers with serial interface and mpsa42 type transistors would be
a decent replacement. Especially if getting the boards preassembled by
jlcpcb or similar, where parts count is less of an issue than by-hand
I almost invariably use daisy-chained 74HC595s in my clocks. I use
Numitrons rather than Nixies, which can be direct-driven with 5 volts, and
an 8051 variant (AT89C4051) because I have lots of them and a tool chain
I'm comfortable with; they're programmed in C. To drive the clock, data,
and
