This circuit was found in the January 1999 issue of Electronics Now magazine. The circuit uses an integrated circuit from the period and has earphone listening.
This circuit can also be used as a shield if the excitation is made with 5 V and the output stage...
This type of sensor was used in sensitive infrared systems from the 1960s. This circuit was found...
We find this circuit in a documentation for engineers from 1971. The circuit generates rectangular and...