Wherever possible in Elektor circuits, transis-tors and diodes are simply marked `TUP`!Transistor, Universal PNP), `TUN` (Transistor Uni~ersal NP.NI. •~UG_` (Diode, Universal Giu:, mamum) or DUS (Diode, Universal Silicon). This indicates that a large group of similar devices can be used, provided they meet the minimum specifications listed in tables 1a and 1b.
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