Lighting control interface apparatus

In a remote control switching system having an interface apparatus capable of producing momentary first and second electrical signals to control energization of first and second coils of solenoid actuated relays respectively in response to interruption and initiation of an input signal present at an input for the apparatus, said apparatus comprising:

• a first comparing means having a sensing input operably connected to the apparatus input to sense changes in the input signal by comparing the input signal with a first reference voltage value, the first comparing means having a first output whose voltage value changes from its first to its second level when the input signal becomes less than the first reference value and changes from its second to its first level when the input signal becomes greater than the first reference value;
• a second comparing means having a sensing input operably connected to the first output to sense changes in the first output voltage value by comparing the first output value with a second reference voltage, the second comparing means having a second output whose voltage value changes from its first to its second level when the first output voltage value changes to its first level becoming less than the second reference value and changes from its second to its first level when the first output voltage value changes to its second level becoming greater than the second reference value;
• a first pulse generation means connected to the first output to provide the momentary first electrical signal to the first coils when the first output voltage value changes from its second to its first level;
• and,
• a second pulse generation means connected to the second output to provide the momentary second electrical signal to the second coils when the second output voltage value changes from its first to its second level.