Verkehrsfunk SK-Dekoder (57-kHz-Signal mit Stereodekoder 76115 decodieren)

By means of the IC T AA 13 1 and a few external components a simple square- ` wave generator can be built which is eminently suitable for testing amplifiers, for instance. The circuit operates well on a voltage of l.SV, but it is still reliab.le with a upply voltage of about 1 V. onsequcntly, it is possible to build the enlire circuit plus the battery (mercury cell!) into a small case.