This circuit was found in the October 1994 issue of Electronics Now magazine. The 4046 PLL is not very common these days.
This signal injector and tracer (follower) was found in an old American documentation. The...
This circuit of the 80's makes use of components of the time. The circuit is from an American...
This circuit was found in a former Popular Electronics. The timing is given by R1 and C1, R4 and...