This biestable vox circuit was found in an old documentation. The circuit makes use of components of the time (80's) and can work as a shield since the power is 5 V.
A recreational application of the 4018 is shown in the figure in which we have electronic dice....
It can be obtained from Mouser Electronics new tactile keys subminiature SMT KMR 6 Series C & K....
This circuit is indicated to operation with piezoeletric transdicers or other with high impedance...