This 16-second voice recording circuit was featured in a telephone answering machine circuit in the March 1992 issue of Radio Electronics magazine.
This 555-based circuit was found in the August 1976 issue of Radio Electronics magazine. The tone...
This circuit for a frequency of 40 kHz was found in an old Electronic Design. There were no...
This system of sequential lights for shop windows, discotheques, stores, does not use integrated...