[Code of Federal Regulations] [Title 21, Volume 8] [Revised as of April 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR882.1835] [Page 435] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 882_NEUROLOGICAL DEVICES--Table of Contents Subpart B_Neurological Diagnostic Devices Sec. 882.1835 Physiological signal amplifier. (a) Identification. A physiological signal amplifier is a general purpose device used to electrically amplify signals derived from various physiological sources (e.g., the electroencephalogram). (b) Classification. Class II (performance standards).