Auto electric tester

  • US 5,030,916 A
  • Filed: 06/25/1990
  • Issued: 07/09/1991
  • Est. Priority Date: 06/22/1990
  • Status: Expired due to Fees
  • ×
    • Pin
First Claim
Patent Images

1. An auto electric tester comprising, a casing, circuitry mounted within the casing, four electrical conductors extending from the casing and connected to said circuitry, said circuitry comprising a full-wave bridge rectifier connected to a first two of the conductors, a relay connected across the bridge so that current flowing in the two conductors in either direction to the bridge will activate the relay, a first circuit tap made between the bridge and the relay extends to a third one of the conductors and includes in series a diode and a load resistor, second and third circuit taps extend in parallel from the first circuit between said diode and said load resistor to the fourth conductor, said second circuit including in series a relay switch operated by said relay and an audible indicator, said third circuit including in series a resistance and a visual indicator.

View all claims

    Thank you for your feedback