These circuits were obtained in an Electronics Now from the 90s. The integrated circuits are from that time and the power can be between 1.5 and 2 V.
This configuration that appears in other points of this section was obtained in a 90’s Popular...
This circuit is from an Argentine publication from 1973. It provides a signal to an amplifier from...
This circuit is from a magazine 73 for radio amateurs of the 90s. The circuit generates the high...