This two-tone decoder has a bandwidth of 24%. The circuit is from a 1994 Electronics Now. The components without the value determine the recognized frequency.
Many people currently use the bicycle as a means of transportation and leisure in large cities....
This circuit can serve as a basis for a robot that follows a line on the ground. The circuit has...
This circuit was found in a 80's Popular Electronics. The sensor can be any phototransistor. The circuit is...