a surface wave device programmable to produce any one of a plurality of phase coded swd digital delay line configurations from a single transducer pattern characterized by parallel transducer electrode arrays to provide for each of two opposite phase alternatives of acoustic surface waves being propagated . each transducer comprises pairs of interdigital taps , each tap characterizing a single binary bit . transducer phase coding is accomplished by severing in selected taps all metalized fingers of like polarity from their common conductor bar . critical configuration tolerances prohibitive to programmed operations are thus obviated .