(under subclass 189) Subject matter having four circuit element branches connected in series to form a closed circuit, two nonadjacent junction points serving as input terminals while the remaining two junctions serve as output terminals.
(1) Note. At least two of the circuit element branches include a piezoelectric vibrator.
(2) Note. Two of the circuit branches may be formed by a transformer winding having a mid-tap, the mid-tap forming one of the input or output terminals, and the other winding of the transformer forming the output or input connecting means. See Fig. 4 below.
