This circuit was originally designed to measure capacitance with an ICL7107 but can be used with other digital modules. The circuit is from Electronics Now magazine from November 1996.
This circuit is from an old Elektor using components that are not currently common. The circuit is...
Pressing S1 the LED glows by a time interval depending on the capacitor. Time intervals in the...
Here we have an interesting circuit found in a 1981 publication that causes two LEDs to flash...