This circuit was found in 80's documentation from Analog Devices. The formulas for calculating the components as a function of frequency are given next to the diagram.
This circuit with unijunction transistors was found in a documentation from the 80's. The trigger...
We found this alarm in an English publication from 1978. Although the original power supply is 3...
This TTL circuit was found in the February 1973 issue of Radio Electronics magazine. The power...