And it works !

A project log for Numitron Hexadecimal display module

Another hexadecimal display, this one is sans transistor for the extra vintage touch, and uses only Soviet-era parts

Yann Guidon / YGDES • 04/22/2018 at 05:49•2 Comments

Here is the module, much closer to the intended format.

The module is quite larger than initially desired but the thickness is ok, so I can stack several modules and keep the numbers easy to read (with a decent gap between digits).

After a while, the relays can get warm...

I had to increase the voltage because some relays wouldn't switch. Strings can get unbalanced so I will have to "bin" the relays ( #ReTest-RPi is meant to address this). So the module gets up to 3.50V (×2) and F draws up to 0.45A (the power consumption is around 2W). Digit 0 draws quite little.

The power connector must definitely be redesigned...

Now, I think that surface in itself is not SUCH an issue and I can make the module thinner by bending the relays outwards/outside. That's the program for the next 4 modules :-)