Found in the September 1984 issue of Radio Electronics magazine, this circuit uses common components. The trigger characteristics are given by the formula in the diagram.
Using components from the era, this 90's EDN circuit is used in analog to digital conversion...
Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V...
We found this circuit in an old Popular Electronics. The circuit is experimental, driving an LED...