This low frequency divider uses unijunction transistors. The bipolar transistor can be a BC548 and the zener diode Z4XL can be a 12 V zener. The circuit was found in a 1967 publication.
This crystal oscillator circuit is indicated for use as a frequency reference in the calibration...
This circuit was obtained from the 1976 Siemens integrated circuits manual. It is the circuit for...
This simple circuit, powered by 4 batteries or 9 V battery, brings together several functions of...