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 circuit is from a 1992 publication. The transistors can be the BC549 or BC548 and the power...
This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The...
September 2016 - It can be obtained from Mouser Electronics the new inductors for power supply of...