Lesson 13 Specialized Transistors—The SCR

Chapter Lesson 13 Specialized Transistors—The SCR

Electronic Circuits for the Evil Genius Second Edition 64 Lessons with Projects
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Electronic Circuits for the Evil Genius Second Edition 64 Lessons with Projects

  • I got such a laugh when the circuit in FigureL12-14 was presented to me for troubleshooting.This person did not follow directions. Theymanaged to mount the parts on the wrong side ofthe printed circuit board. They made a mess. Itdidn’t work. There is never enough time to do itright, but there is always time to do it over.Finishing UpI would recommend using a touch of hot glue oneach corner of the PCB and then pressing thecircuit onto a thick piece of cardboard. You canmount it on anything that is an insulating material.Anything metallic would short-circuit your project,and probably destroy the transistor.Lesson 13Specialized Transistors—The SCRThere are many highly specialized types oftransistors. Here we use a latching switch called asilicon-controlled rectifier (SCR). This componentis also referred to as a triode for alternatingcurrent (TRIAC). The SCR acts like a “trapdoor.”Once triggered, it stays latched open. You arefamiliar with this because it is the basic componentLesson 13 ■Specialized Transistors—The SCR 49Figure L12-12Figure L12-13Figure L12-14