Western Electric AC LED  
Written by Accutron on 2008-02-16  

The Western Electric AC LED has two green dies of opposite electrical orientation, wired in parallel. The LED is normally operated at 60Hz, installed in a Western Electric Trimline telephone handset. This device has an unusual concave lens and large heatsink leads.

Western Electric AC LED, removed from a Trimline rotary handset. The LED is being driven with a 10kHz sine wave. At lower frequencies, the two dies blink alternately. Note that the LED dies appear greatly enlarged due to the unusual lens shape.

Western Electric AC LED, underside construction.

Keypad from a Trimline pushbutton handset. The keypad has two AC LEDs spot welded directly to a large metal sheet.

This article is part of the [Discrete Optoelectronics] exhibit.

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