This is an oldie, but oh, man is this ever good. It’s a Nixie clock made without a microcontroller. In fact, there aren’t any logic chips in this circuit, either. As far as we ...

Figure 6 Inside view of a simple Geiger-Counter Figure 7 Basic system diagram of a full-fledged Geiger-Counter Schematics around GM tubes are mainly related to the precision high voltage generation.

The components needed for this circuit is: 74164 IC 7404 IC ( Inverter ) 35Mhz clock source 5v supply Indicators to indicate the state In above diagram X1 to X8 are indicators to indicate the current ...