Schematic
Royal Digital V Calculator: Reverse-Engineered Schematic
Schematic of the Royal Digital V pocket calculator of 1972 with an eight-digit fluorescent tube.
Schematic
Schematic of the Royal Digital V pocket calculator of 1972 with an eight-digit fluorescent tube.
2 5 7 8 U1,2 Mitsubishi AC 33 M58212 AC OFF 10V 4 OFF DC 1 100K DC 47K C711 4.7 23 T2 # of cells C1014 25V 1 1 A678 unknown U1 16 V–24 V–24 50K 4.7 250K 150p 50V 5 V–24 300K 3 V–24 V–45 Sa Sa FUTABA 8-CT-01 4.5V-6V 11 V–45 1.5K 0 8 DIGIT VACUUM FLOURESCENT (as viewed 6 Sb U1.11.12 T11 Sb DISPLAY MODULE from exterior) 12 5 a ?V 3 Sc U2.1.16 T17 Sc 8 f b 7 g 7 Sd U1.3.15 T4 Sd 7 8 e c 20 Se U1.4.14 T3 Se 6 p 1 d Sf U1.6.13 T1 Sf 9 2 Sg U1.9.10 T12 Sg 10 DP Sp U2.9.10 T18 Sp D8 D1 14 17 of T9 220K A678 General D5678 24 T10 A678 22K 22K Instrument D1234 21 251F T8 2• A678 47p 47p 4 150K 4.7K 2 5 13 6 300K 4 T14 9 C711 C711 3 V–45 A678 3 U2 15 250K V–24 V–24 300K + D48 V–24 17 V–45 – D37 U2.11.12 T7 T16 16 D26 U2.4.14 T6 T15 18 ÷ Notes D15 U2.6.13 T5 T13 19 = • Clock rate is 96.3 KHz, number cycle is 404 Hz. 15 • Capacitance in microfarads unless otherwise specified. K 22 • Based on unit with Serial No. 82 21574. C 20 • 2001 May 23: Initial drawing / bhilpert. 2 2020 Feb: Format updates / bh. V–24 V–24 Royal Digital V Calculator Page: 1 of 1 Printed: 2020 Feb 6