Incandescent lamp driver circuit

Claim 1

Apparatus for supplying electrical energization to an incandescent lamp comprising: (a) a capacitor connected between a junction point and ground; (b) first resistor means connected between said junction point and a source of reference voltage; (c) first electronic switch means having a ground connection and including means for responding to an "on" signal applied to an input thereof for causing said switch means to have an "open" state at an output thereof and means for responding to an "off" signal for causing said switch means to have a "closed" state, i.e., said output being connected to said ground connection; (d) means connecting the output of said first electronic switch means to said junction point; and (e) second electronic switch means having a ground connection, an input and an output, said input being connected to said junction point, and said output being connected via an incandescent lamp, to a source of lamp energizing voltage, said second electronic switch means having an "open" state when no signal is applied to said input thereof, and a "closed" state, i.e., said output being connected to ground through said ground connection when a signal is applied to said input thereof, whereby when an "on" signal is applied to the input of said first electronic switch means, said capacitor means begins charging through said first resistor means toward the voltage of said source of reference voltage, to thereby apply a signal to the input of said second electronic switch means so as to cause a connection to be established between the output thereof and ground so that current begins to flow through said incandescent lamp.