This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is from the 90s. The operational ones used admit modern equivalents.
This circuit for old platinum cars was found in a 1967 Motorola documentation. The power...
This egg timer has been found in an English magazine that no longer exists in 1982. The...
This circuit is from an old Signetics documentation. It can be implemented with modern operational...