This circuit is from the National Semiconductor's Linear Applications Handbook of 1994. The circuit can be implemented with equivalent operational. The detected voltage is given by the diode.
This circuit is from a 1977 Radio Shack documentation. In it we have the activation of an LED for...
This timer for a few minutes was originally indicated for photographic applications. We found it...
This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the...