| 摘要 |
Testing apparatus for testing string lamps such as hose of Christmas lights. The apparatus includes a hand held housing having two sockets for testing lamps, an indicating lamp, and a buzzer. One socket connects power from a battery to the electrodes of the lamp. The other socket is associated with an inductive circuit which energizes the indicating lamp and buzzer when the inserted lamp is operable. Externally exposed electrodes connected to the indicating lamp and buzzer enable testing of fuses. Internal circuitry includes a 4069 chip containing a plurality of individual amplifiers.
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