title: A simple electronic circuit for monitoring changes in the duration of the action potential.
abstract: A simple electronic circuit is described that produces a ramp voltage, the amplitude of which is proportional to the duration of the action potential. The circuit is ideal for monitoring changes in the duration of the action potential on slowly moving chart paper.
mesh_terms: D000200:Action Potentials; D000818:Animals; D004581:Electronics / Q000295:instrumentation*; D004594:Electrophysiology / Q000295:instrumentation*