Kaffeewärmer (Timer bis 4 Stunden mit Triac, 3094)

Wherever possible in Elektor circuits, transis-tors and diodes are simply marked `TUP` (Transistor, Universal PNP), `TUN` (Transistor, Universal NPN), `DUG` (Diode, Universal Ger-manium) or `DUS` (Diode, Universal Silicon). This indicates that a large group of similar devices can be used, provided they meet tha minimum specifications listed in tables 1a and 1b.