This small audio amplifier uses an uncommon integrated circuit today. The circuit is from a documentation from the 70s and is indicated for portable receivers of the time.
Found in American documentation, this crystal oscillator that can have harmonics in the FM range,...
We found this digital CMOS circuit in a documentation from the 90s. The circuit generates signals...
The 4051 in the configuration shown in the figure can be used as a selector of both analog and...