United States Patent 3,202,904
August 24, 1965

Electronic Switching Circuit
Glen R. Madland

Filed July 17, 1961
Image of US PATENT 3,202,904

Abstract of the Disclosure

This invention relates generally to transistor circuits for switching and amplifying applications, and in particular relates to a transistor circuit for use in the electrical ignition system of an engine and in other systems where a circuit capable of withstanding relatively high voltages is required.
Figure descriptions: cover graphic

  • Figure 1 is a circuit diagram of an ignition system which includes a multiple transistor circuit in accordance with one embodiment of the invention.
  • Figure 2 shows a modified form of the ignition system of Figure 1 which represents another embodiment of the invention
  • Figure 3 shows still another embodiment of the multiple transistor circuit and in particular shows the three terminals of the circuit which are equivalent to the emitter, base and collector terminals of a single transistor.
  • Figure 4 is a graph which shows the electrical characteristics of the circuit of Figure 3.
  • Figure 5 shows a system in which the circuit of Figure 3 is represented by an enclosure shown in dotted lines and whose purpose is to supply continuously variable power to a load.

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