This 100 second timer was found in the September 1992 issue of Radio Electronics magazine. The circuit has two timing ranges and time adjustment at R6.
We found this circuit in a 1975 publication. The power supply must be symmetrical, but other...
This circuit is from 1977 documentation, and high current equivalent transistor must be used. The...
Although indicated in the original publication of the 1980s as a capacitance switch, the circuit...