An improved dimmer apparatus which can protect an output power transistor for a lamp of a load when the lamp is short-circuited and which can eliminate manual operation for restarting the apparatus after recovery of the short-circuiting of the lamp. The apparatus comprises a detecting circuit which detects...http://www.google.de/patents/US4788474?utm_source=gb-gplus-sharePatent US4788474 - Dimmer apparatus
