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 was found in a 1970 Philips documentation. The components are from the time, and...
This circuit uses two sensors that are placed at the intersection of a miniature railway, causing...
This application is not modern since few computers have parallel ports. But you can use this...