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Modular Aud Power System Spectrum Dac/Adc Board Signal Generator F-V Converter Microwriting Australia $1.60 New Zealand $1.75 M alaysia $4.95 P R A CTIC AL FE B R U A R Y 1985 - ELECTRONR O B OTIC S - MI C R O S - ELE CTR O NIC S- INTECS RF ACIN G MODULAR AUD POWER SYSTEM SPECTRUM DAC/ADC BOARD SIGNAL GENERATOR F-V CONVERTER MICRO WRITING The Principle and the Product Have you one of these? r BBC * COMMODORE 64 DRAGON * VIC 20 ORIC 1/ATMOS ATARI 400/800 SPECTRUM * ZX81 ou need 0 Of these Best Guide to Microcomputer Software sonwaRe INDEX 1984N0.5£1.50 Now with 5,000 programs more educational, games, business & personal ON SALE management listings than ever before! NOW! R O B O TIC S MI C R O S ELE CT R O NIC S INTE RF A CIN G ISSN 0032-6372 V OL U M E 21 I\J9 2 FE B R U A R Y 19 8 5 C O NSTR UCTIO N AL PR OJECTS M ODULAR AUDIO PO WER SYSTE M —Part 1 by M. Tooley BA and D. Whitfield MA MSc CEng MIFF. 10 Main power amp module SPECTRU M DAC/ADC BOARD by R. A. Penfold . 15 Interface board for control applications MICROPROCESSOR CONTROLLED D.C. MOTOR DRIVERS by Tom Gaskell BA(Hons) CEng M1EE . 31 Enables analogue driving of dc. motors SIGNAL GENERATOR & F-V CONVERTER by John M. H. Becker 34 Quality test instrument NEPTUNE AND MENTOR ROBOTS by Richard Becker and Tim Orr . 49 Part Six: Com missioning and testing of Neptune M ONO/STEREO CHORUS & FLANGER by John M. H. Becker . 59 Part Two: Construction and setting up G E NE R AL FE AT U RE S MICRO WRITER by Tom Gaskell BA(Hons) CEng MIEE . 22 An ingenious six-key alternative to the QWERTY keyboard SEMICONDUCTOR CIRCUITS by Tom Gaskell BA(Hons) CEng MIEE . 28 Power Op-Amps (TCA 365 and TCA 2365) SPACE WATCH by Dr. Patrick Moore OBE 40 INGENUITY UNLIMITED .. 42 Readers' circuit ideas SEQUENTIAL LOGIC TECHNIQUES by M. Tooley BA and D. Whitfield MA MSc CEng MIFF 55 Part Five: Data multiplexers N E WS & C O M M E N T EDITORIAL 7 BAZAAR . .. 18,48 MICROBUS .. .. 65 NE WS & MARKET INDUSTRY NOTEBOOK.. 21 VERNON TRENT .. .. 67 PLACE .. 8 LEADING EDGE .. .. 25 P.C.B. SERVICE .. .. 68 THIS MONTH'S COVER... Our cover photograph shows silicon wafers in a furnace during the produc- tion of integrated circuits. Photograph courtesy of National Semiconductor. OUR MARCH ISSUE WILL BE ON SALE FRIDAY, FEBRUARY 1st, 1985 (see page 47) IPC Magazines Limited 1985. Copyright in all drawings, photographs and articles published in PRACTICAL ELECTRONICS is fully protected, and reproduction or imitations in whole or part are expressly forbidden. All reasonable precautions are taken by PRACTICAL ELECTRONICS to ensure that the advice and data given to readers are reliable. We cannot, however, guarantee it, and we cannot accept legal responsibility for it. Prices quoted are those current as we go to press. ItPractical Electronics February 1985 TRANSISTORS 221929im8 11: TIM - 11 g11.415 II r11 5458/9 160 WATFORD .ELECTRONICS - 35 TIP31C 45 214930 20 2N5777 45 , 33, CARDIFF ROAD, WATFORD,.HERTS WD1 8E0, ENGLAND AC127/8 35 13C308E1 18 BFX85/86 35 71P32A 43 2N1131/2 40 2146027 32 1 AC141/2 35 BC327/8 15 BFX87/88 28 11P32C 45 2N1303/4/5 2146109 60 Tel. Watford (0923) 40588. Telex: 8956095 WAELEC AC176 35 BC337/8 15 BFY50/51 30 1IP33A 70 2141307 70 2N6290 70 AC187/8 35 8C441 34 BEY52 30 1IP33C 75 2N1613 30 25A636 250 OR DERS NOR M ALLY DESP ATCHE D BY OF POST RETURN AC188 35 8C461 34 BFY53 35 11P34A 85 2N1671B 160 254671 250 A0142 120 6C477/8 40 BEY55 35 11P34C 105 2N2160 325 2SA715 75 A0I49 79 5C516/7 40 AU. DEVICES BRAND NEW. FULL SPEC. AND FULLY GUARANTEED. SEND CASH, P.O.'s OR CHEQUE BP/56 35 1IP35A 120 2N2219A/20A/ 25C495/6 85 WITH ORDER. GOVERN MENT AND EDUCATIONAL INSTITUTIONS OFFICIAL ORDERS ACCEPTED 13FY64 40 1IP35C 130 21A/22A 25 25C1061 250 VM I2 9542 58C54C549C718 12 15 (ACCESS ORDERS BY TELEPHONE 0923-50234). TRADE AND EXPORT INQUIRY WELCOME. P & P BFY90 80 1IP364 130 2142369A 18 25C1096 85 25C1162AFI39 45 40 5C556/7 15 BRY39 50 1IP36C 140 2N2646 45 ADD 70p TO ALL CASH ORDERS. OVERSEAS POSTAGE AT COST. PRICES SUBJECT TO CHANGE. AF239 55 5C5 15 B5X20 30 11P41A 50 2N2846 80 25C1172/3 125 ige Export orders no VAT. U.K. customers please add 15% VAT to total cost incl. p&p. 5C107/8 12 BCY41/42 30 5SX29 45 19415 52 2N29044/054/ 2SC1306 100 VA 1 We stock thousands more items. It pays to visit us. We are situated behind Watford BC107B 14 BCY70 18 BSY26 35 TIP42A 55 064/07A 26 2SC1307 150 Football Ground. Open Monday to Saturday, 9.00am to 6.00pm. Ample FREE Car parking. BC108B 14 5CY71 20 BSY95 35 1IP425 58 21429260 10 25C1449 95 BC108C 14 BCY72 25 5U105 180 11P120 70 2N3053 25 25C1679 190 POLYESTER RADIAL LEAD CAPACITORS: 250V; 10n, 20n, 15n, 22n, 27n 6p; 33n, 47e, 68n, 100n 8p; 150n, 5C109 12 8CY78 30 5U205 190 1IP121 73 2N3054 55 25C1678 140 220n 10p; 330n, 470n 15p; 680n 19p; 10 23p; 1p5 40p; 22 46p. BC1095 14 50131/2 65 B0206 200 11P141 120 2N3055 50 2SC1923 65 BC109C 14 8D133 60 BU208 200 11P142 120 2143442 140 25C1945 225 ELECTROLYTIC CAPACITORS (Values in on, 500V; 105 F 52p; 47 7gp ; 63g ; 947, 1-0,1.5, 2-2, 3-3, ills; 47 BCI14/5 30 50135 45 MJ2955 90 1IP147 120 2N3615 199 25CI953 90 9P; 10 10 P: 15,22 12P; 33 15p; 47 12p; 68 16p; 100 19p: 22026p; 1000 70 P; 2200 99p; 50V: 6820p; 100 BC117/8 25 50136/7 40 MJ5340 54 11P2955 70 2N3663 20 25C1957 90 17p; 220 24p; 40V: 68 1 89; 22 9P; 33 12 P: 330 , 470 32 P: 1000 48p; 2200 90p; 25V: 4,7, 10, 22, 47 8p; 100 5C140 38 50138/9 40 MJ5371 100 11P3055 70 2N3702/3 10 2SC1969 165 11p; 150 12p; 220 15p: 33022p; 470 25p; 680. 100034p; 1500 42p; 2200 50p; 3300769; 470092p; 16V: 5C142/3 38 50140 40 AAJE2955 99 71543 50 2N3704/5 10 2SC2028 85 2.5, 40 8p; 47.68, 1009p; 125 12p; 220 13p; 330 16p; 470 20p; 680349; 1000 27p; 1500 31P: 220036p; 4700 BC147/8 12 50158 60 mjE3055 70 11544 45 2143706/7 10 25C2029 200 79p. BC1475 15 BD245 65 MPF102 40 715884 50 2143708/9 10 2SC2078 170 5C148C 10 50434 70 MPF103/4 30 T1590 30 2143710 10 25C2091 85 TAG-END TYPE: 6491: 4700 245p; 3300 198p; 2200 POTENTIO METERS: Carbon Track, BC149 12 80695A 150 MPF105 30 1IS91/93 32 2N3771 179 25C2166 165 LW*: Si110,229 1.944-....M0P 110p,- 405: 4700160p; 2511: 025W Log & Linear Values. 8C149C 15 506964 150 MPSA05 30 VK1010 99 2143772 195 2SC23I4 85 47IX Y 98p; 10.000 320p; 15,000 345p. 8C153/4 30 BF115 45 MPS406 25 VNIOKM 70 2143773 210 2SC2335 200 500W, 1K & 2K (UN ONLY) Single 3.5p BCI5718 14 ElF154/13 30 MPS408 30 VN46AF 95 2N3819 35 2SC2465 125 TANTALU M BEAD CAPACITORS: ' 5K0-2MI-1 single gang 3. P 5CI59 11 5E167 35 MPSA12 32 VN66AF 110 2N3820 60 25C2507 40 5K0-2M0 single gang D/P switch ,95m P _ 351/: 0.10, 0,22, 0.33 15p 047, 0.68, 1-0, 1-5 16p 2.2, 3-3 18p 4.7, 8CI67A 14 5E173 35 MPSA55 30 VN88AF 120 2N3822/3 60 2SC2612 200 5K0-2M0 dual gang stereo .. P 58 22p 10 28p 1891: 22,33, 16p 4.7, 58, 10 18p 1536p 22 5C168C 12 8E177 36 MPS456 30 VN89AF 120 2143866 90 250234 75 36p 33, 47 50p 100 95p 220 100p 1091: 15, 22 26p 33, 47 5C169C 12 BF178 35 MPS470 40 ZTX107/8 12 2143903/4 15 25K45 90 SLIDER POTENTIOMETERS - 50p 100 75p. 5C171/2 12 5E179 40 MPSUO2 58 Z1X109 12 2143906/5 15 2SK288 225 025W log and linear values 60rnm track BC173 15 13E194/5 12 MPSUO5 60 ZTX2I2 28 2144037 60 25J83 225 51(0-5001(0 Single gang 30 P SILVER MICA (pf) SIEMENS mulitlayer miniature 8C177/8 18 13E198/9 18 MPSUO6 60 Z7X300 13 2N4058 15 25J85 225 2, 31, 47, 6.8, 8-2, 10, 12, 18, capacitors. 5C179/81 20 13E200 30 MPSU52 65 ZTX301/2 16 2144061/2 15 314128 115 22, 27, 33, 39, 47.50, 56,68,75, 250V: 1nF, 1n5, 2n2, 3n3, 447, PRESET POTENTIO METERS 8C18I 30 8E224 40 MPSU55 60 ZTX303 25 2N4264 30 3N140 115 0-1W 500-2-2M Mini Vert. & Horiz. 89 82. 85, 100, 120, 150. 180 15P. 6n8, 8,12, 10 n, 150, 22 n 7p; 18n, 5C182/3 10 BF244A 28 MPSU56 60 ZTX304 17 2144286 25 40251 150 220. 250, 270, 330, 360, 390, 27n, 33n, 078 69; 39n, 56n, 68n 0-25W 220<3/4m7 Vert. & Hone. 12p BC184 10 BF2448 29 0C23 170 Z1'X320/26 30 2144269 25 40311 60 470, 600, 8005 820pF 21p. 9p, 00nF 11p. 13C1821 10 BF245 50 0C28/36 220 ZTX500/1 14 2144400 25 40313 130 1000, 1200, 1800 30p each 100V 100n, 120n, 10p; 150n 11p; RESISTORS Hi-stab, Ministure, 5% BC183L 10 5F256B 50 0C41/42 75 ZTX502/3 18 2N4427 80 40361/62 70 3300, 4700 60p each 2206 139; 3300 18p; 4700 23p; Carbon.
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