Digital transistors

[Snarf81]

Thanks very much, Bill.

I'll have a read of that a little later when I get some spare time.

Cheers
Richard.

[Maarten]

Originally Posted by Radio Wrangler

Standard practice in Japan is not to mark the full type number. Try 2SC144 etc

That would be a suspiciously low number, so a big red flag to keep on searching. In this case it's DTC144, with the suffix indicating the resistor values. A normal NPN can be used, adding those resistors.