Longines Symphonette  Electronic Calculator (B Series)

Date of introduction:  1972 Display technology:  LED-modules
New price:   Display size:  8
Size:  5.8" x 3.5" x 1.5"
 147 x 88 x 38 mm3
Weight:  6.7 ounces, 191 grams Serial No:  B 5033
Batteries:  4*NiCd AA Date of manufacture:  mth 12 year 1972
AC-Adapter:  unknown Origin of manufacture:  USA
Precision:   Integrated circuits:  TMS0103
Program steps:   Courtesy of:  Joerg Woerner

Just a minor design variation of the original Longines Symphonette Electronic Calculator. Please focus on the color of the numeric keyboard caps.

EC_B_PCB.jpg (290461 Byte)Dismantling the featured Longines Symphonette Electronic Calculator manufactured in December 1972 reveals a typical design based on the TMS0103 single chip calculator circuit used in the famous Bowmar 901B. We locate the display drivers SN75491 and SN75492and even the display modules look familiar.

Klixon™ is a trademark of Texas Instruments.

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© Joerg Woerner, October 5, 2011. No reprints without written permission.