The circuit is from the 1977 National Semiconductor Audio Handbook. The bass and treble control is Baxandall type. The integrated circuit used is not common today.
The circuit shown serves as a direction indicator or arrow for bicycles, robots and other...
This circuit was found in an 1888 publication. However, since it uses common components, it can...
Featuring low output impedance and high input impedance, this configuration was found in a 1980s...