Found in a 1965 Electronic Design, this circuit limits surges in a load when power is applied. The diodes and SCR must be according to the load.
This 1970 Philips circuit uses a mechanical counter. The circuit is triggered by a reed switch...
By the components used this circuit of old English documentation can still be easily assembled. The...
It can be obtained from Mouser Electronics new tactile keys subminiature SMT KMR 6 Series C & K....