Which of the following IC is a variable negative voltage regulator?(a) 7912(b) 7905(c) LM337(d) LM317This question was posed to me by my college professor while I was bunking the class.The above asked question is from Telemedicine System topic in division Telemedicine Technology of Biomedical Instrumentation

Which of the following IC is a variable negative voltage regulator?(a)

1.	Which of the following IC is a variable negative voltage regulator?(a) 7912(b) 7905(c) LM337(d) LM317This question was posed to me by my college professor while I was bunking the class.The above asked question is from Telemedicine System topic in division Telemedicine Technology of Biomedical Instrumentation
Answer» Right choice is (C) LM337 Explanation: LM337 is a variable negative voltage regulator IC. It is capable of drawing CURRENT up to 1.5A and voltage range from (-1.25V) – (-30V) ideally. LM317 is a variable positive voltage regulator IC. 7905 and 7912 are fixed voltage regulator IC that give OUTPUT voltage as -5V and -12V respectively.

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