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.
We found this circuit in a 1967 Electronic Design. The circuit used a MOSFET of the time, which is...
In the figure we show how to add an indicator LED to an MC1310 stereo decoder. The circuit is from...
This circuit was originally suggested by General Electric in 1966 documentation to power...