This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The circuit uses components that can still be found today.
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...
Found in an English documentation from 1982, this circuit can be changed to operate in a different...
I found this circuit in an old English magazine from 1979, but it can be easily assembled with...