This circuit, which is present in other points of this website, was found in a 90s Hands On Electronics. The circuit activates a buzzer with an oscillator.
This circuit is based on an old Siemens integrated that can now be found very easily. It allows the...
This sophisticated photometer that has a light comparator with LED indicator came out in an...
The integrated circuit of this instrument is not common today. Equivalent operational can be...