This circuit mimics the trill of a bird. We found it in an American documentation from the 90s. It is based on the LM3909 integrated circuits.
This circuit is from a 90s Popular Electronics. It appears elsewhere on this site. Q1 can be any...
This circuit was found in a 90's Electronic Design. It takes advantage of the nonlinearity...
In the figure we have an example of an application of a monostable in which the shot is made by...