Early 70's Technology

[Bob Ayers]

A few months ago I found some devices I worked on back in the early 70's. The device was a ceramic packaged device with a GaAs chip containing 64 IR LEDs. This device was used in an optical character reader machine for the banking industry.

IR LED device mounted on PCB:

IR LED device before mounting on PCB:

IR LED device without lens:

IR LED device showing GaAs chip with 1mil (0.001") diameter gold wirebonds:

 

[cody93]

I love being able to replace components on a pcb board, surface mount stuff can be a PITA to repair.

 

[Bob Ayers]

I love being able to replace components on a pcb board, surface mount stuff can be a PITA to repair.

Thanks! Here is a few photos of SMT:

Circuit board:

1st photo taken with 24 70mm lens, showing sizes relative to penny (red circles):

Location #1:

Location #2: