This traditional TTL configuration was obtained in a 1977 documentation. The supply must be made with 5 V and the capacitors can be changed for operation at other frequencies.
This circuit generates a pulse of duration determined by the capacitor when an object interrupts the...
The circuit found in a 1983 publication is shown in the figure. Taking advantage of the...
This low-pass filter was found in an American publication from the 80's. The circuit uses an...