DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
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 |
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| 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: | 8 | Integrated circuits: | TMS0103, 2*SN75491, 2*SN75492 |
| Memories: | Displays: | DIS40, DIS95 | |
| 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 of the Klixon™ keyboard.
Dismantling
the featured Longines Symphonette Electronic Calculator manufactured in December
1972 reveals a typical design based on the
TMS0100
single-chip calculator circuit used with the famous
Bowmar 901B and powered by four
AA-sized rechargeable batteries.
The electronics of the Longines Symphonette Electronic Calculator is centered around a Texas Instruments
TMS0103 single-chip calculator circuit and
- like most early designs of the wildly successful TMS0100 family - two
SN75491 Segment Driver chips and two
SN75492 Digit Driver chips, each for the
LED display.
The two pre-configured LED-modules
(DIS40,
DIS95) are based on the
TIL360 arrays and soldered directly on
the printed circuit board (PCB) of the Electronic Calculator. The remaining
components on the PCB are mainly used to generate the necessary supply voltage
of the TMS0103 and its clock signal for the internal timing.
Klixon™ is a trademark of Texas Instruments.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, October 5, 2011. No reprints without written permission.