title: Operational amplifier circuit to control the intensity of a C.R.O. spot.
mesh_terms: D000200:Action Potentials; D000669:Amplifiers, Electronic; D000818:Animals; D002490:Central Nervous System / Q000502:physiology; D004581:Electronics; D008839:Microelectrodes; D009991:Oscillometry / Q000295:instrumentation*; D010781:Photography; D051381:Rats