This variable frequency oscillator for radio transmission covers the range from 1.6 MHz to 20 MHz, depending only on the coil used. The circuit is very stable and can be used in amateur equipment.
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...