Schematic
Sharp EL-8131 Calculator: Reverse-Engineered Schematic
Schematic of the Sharp EL-8131 ELSI MATE of 1978 with a nine-digit Futaba fluorescent tube.
Schematic
Schematic of the Sharp EL-8131 ELSI MATE of 1978 with a nine-digit Futaba fluorescent tube.
19 5 13 14 27 220p 28 2 6 2 1 Sa 23 Sa FUTABA 9-ST-20 180K 17 9 DIGIT VACUUM FLOURESCENT Sb Sb DISPLAY MODULE 1 22 V–9 15 TDK –21V Sc Sc 21 1457 11 a POWER 10 Sd Sd 20 3V f b 2.2 8 g –tip 47 7 Se Se 50V 19 10V 2.2K e c 2• 9 VG 6 C1741 8 Sf Sf p AA V–9 18 d 2.2 4 50V Sg Sg 17 100p 3 13 2.2K Sp Sp ?V 1 15 D9 D1 4 50V VN 3 5 7 9 10 12 14 16 18 V–27 SC36442 ØD9 11 n.c.: 12, 16 ØD8 10 each ØD7 9 key 1,17 ØD6 8 26 1 2 3 4 5 6 7 8 9 KC1 ØD5 4 7 25 ØD4 + – ÷ % √ = M+ M– KC2 6 3 ØD3 24 5 C CE CM RM xM 0 . KC3 2 ØD2 4 6,14 8,13 11 10 9 15 16 5 7,12 ØD1 3 2 1 Notes V–9 V–27 • Digit scanning is LSD first. Number cycle is 1.25 KHz (0.8mS). • Capacitance in microfarads unless otherwise specified. • This drawing based on unit with Serial No. 88105287. • 2001 May 07: Initial drawing / bhilpert. 2020 Feb: Format updates / bh. Sharp EL-8131 Calculator Page: 1 / 1 Printed: 2020 Feb 18