This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the hard-to-obtain component of our day. It is for reference only.
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...