We found this circuit in the November 1974 Radio Electronics magazine. The capacitors determine the output time, and it is normal to obtain 1 second for each uF used.
The integrated circuits used in this 1999 project are not very common today. However, they can be...
This circuit is from a 1992 Electronics Handbook. The circuit generates a special tone effect for...
This circuit was found in a 90s documentation from National Semiconductor. The integrated circuit is from...