Electric timer switch

A timing apparatus comprising:

• a a power supply
• b a programmable unijunction transistor having first, second, and third electrodes, said second electrode of said programmable unijunction transistor being connected to said power supply;
• c timing means connected to said first electrode of said programmable unijunction transistor for energizing said programmable unijunction transistor;
• d a second transistor having first, second and third electrodes, said third electrode of said second transistor being connected to said timing means and said second electrode of said second transistor being connected to said power supply for providing energy from said power supply to said timing means;
• e a third transistor having first, second and third electrodes,
• said first electrode of said third transistor being connected to said third electrode of said programmable unijunction transistor for causing said third transistor to be turned on and off,
• said third electrode of said third transistor being connected to a ground point, and
• said second terminal of said third transistor being connected to a switching means for controlling said switching means;
• said second terminal of said third transistor being further connected to said first terminal of said second transistor for providing a feedback path for controlling said second transistor and said timing means when said power supply is connected to said timing apparatus,
• whereby said third transistor controls said switching means responsive to lapsing of a variable amount of time subsequent to the connection of said power supply, said variable amount of time being determined by a change in charge stored in said timing means, said change in charge being determined by a second amount of time lapsing from a previous disconnection of said power supply, and whereby charging of said timing means is controlled by conductivity of said third transistor.