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 can be used as an answering password system in a store, office, or other location....
This Pierce oscillator was found in American documentation from the 1980s. Transistors support modern...
We found this circuit in a 1980s General Electric documentation. It appears from other sources in this...