This realistic circuit has longer timings for green and red lights, with shorter timings for yellow. The circuit is from an Electronics Now from May 1994.
With the circuit shown, we have an excellent level for the signal obtained from an electret...
We found this circuit in a 1960 Sylvania transistor manual. The relay can be 12 V and C1...
This circuit is from a Popular Electronics from 1992. The circuit employs an equivalent transistor and...