FIREPLACE CONTROL CIRCUIT By Jon Glaser DESIGN BRIEF

FIREPLACE CONTROL CIRCUIT By: Jon Glaser

DESIGN BRIEF ACME Jon Glaser Problem Statement: The Acme Fireplace Company has hired you to redesign the fireplace control circuit for their latest residential gas fireplace. Design Statement: For the redesign, is has been determined that the emergency cut-off value should remain open as long as three of the four sensors indicate that a flame is present. Additionally, the designers have asked you to add a second output indicator to the control circuit. This indicator will output a logic (1) when the four sensors do not all agree (i. e. , not all on, or not all off). This indicator will be used by the service technician to diagnose whether a faulty sensor exists.

NAND MULTISIM F 1= ABD + ABC + BCD + ACD

NOR MULTISIM F 2= ‘AB + ’AD + ’BD + A’C + C’D

REFLECTION This project seemed difficult in the beginning with the truth tables and then making the AOI circuits, then converting the AOI circuits into NAND and NOR circuits. However, once I got over the initial shock once we began bread boarding all the pieces seemed to fall into place. The NAND circuit was easier in the fact that we got the AOI basic design from Multisim, the only had to convert each gate to NAND style. On the contrary, the NOR circuit was ten times more difficult considering for every AOI gate, at times, had to put three gates in replace of it. All in all, this assignment was a learning experience.