Found in an Australian documentation from 1991, this circuit was sold in a kit at the time. It is a small FM transmitter with a very common configuration, also found in other projects on this site.
This circuit was obtained in Radio Electronics from the 90s. The integrated circuit is uncommon...
This 4-digit digital clock for hours and minutes with CMOS integrated circuits was found in a 1995...
This circuit is indicated to operation with low intensity sources such as electret microphones and...