This shield circuit for lamps and other charges was found in a Popular Electronics from the 90's. The MOSFET admits equivalent according to the charging current.
Figure bellow shows how the 4510 can be cascaded for counts higher than 10. The circuit shows the...
E) In this circuit we have the details of a section with the others repeating with the values...
Found in American documentation from 1968, this circuit has an acute cut-off of the frequency to...