An inexpensive miniature preamplifier for monitoring electroencephalographic and extracellular action potentials in unrestrained animals.
A miniature preamplifier is described that is suitable for use with microelectrodes with moderately high impedance (i.e. 10 to 25 micron diameter). The device has a gain of 500 and an imput impedance of 2.2 X 10(7) ohms. The imput noise is less than 20 microvolts r.m.s.
D000200:Action Potentials; D000669:Amplifiers, Electronic; D004569:Electroencephalography / Q000295:instrumentation*; D008839:Microelectrodes; D012149:Restraint, Physical