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Microprocessor For Digital Effects Unit Now available from SILICON CHIP: the 68HC705-C8P pre-programmed micro­pro­cessor IC for the Digital Effects Unit described in this issue. Price: $45 + $6 p+p Payment by cheque, money order or credit card to: Silicon Chip Pub­lica­ tions, PO Box 139, Collaroy, NSW 2097. Phone (02) 979 5644; Fax (02) 979 6503. Circuit Ideas Wanted Do you have a good circuit idea. If so, why not sketch it out, write a brief description of its operation & send it to us. Provided your idea is workable & original, we’ll publish it in Circuit Notebook & you’ll make some money. We’ll pay up to $60 for a really good circuit but don’t make them too big please. Send your idea to: Silicon Chip Publications, PO Box 139, Collaroy, NSW 2097. Electronics, 1/29 Stewart St, Parra­ matta, NSW 2124. Phone (02) 890 2960; Fax (02) 630 3148. Pay by cheque, money order, credit card. UNUSUAL BOOKS: Electronic Devices, Fireworks, Locksmithing, Radar Invisibility, Surveillance, Self-Protection, Unusual Chem­ istry and more. For a complete catalog, send 95 cents in stamps to Vector Press, Dept S, PO Box 434, Brighton, SA 5048. DON’S SHORT FORM KITS: PIC­ 16C54-58/71/84 Universal PCB $23; Basic Stamps $65; Serial Driven 18 I/O $70; Parallel Driven 64 I/O $38; Re- SECONTRONICS Advertising Index COMPONENTS, COMPUTERS, ELECTRON TUBES S/H TEST EQUIPMENT, COMPUT­ ER REPAIRS Altronics ..........................IFC,24-25 RECYCLED EPROMS: ALL ARE CLEANED, ERASED AND BLANK TESTED. Av-Comm.....................................85 2716 2732 2764 27128 27256 Avico Electronics.........................59 $1.50 ea or 10 for $12 $1.50 ea or 10 for $12 $2.00 ea or 10 for $16 $3.00 ea or 10 for $26 $3.50 ea or 10 for $32 David Reid Electronics ..............90 TRANSISTORS, ICs, DIODES 2N3440 $0.50 ea or 10 for $4 2N7000 $0.80 ea or 10 for $6 TIP122 $1.20 ea or 10 for $10 74HC04 $0.60 ea or 10 for $5 1N5060 diodes 100/$10 or 1000 for $70 7406 $0.25 ea or 25 for $5 LM380N $2.50 ea or 10 for $20 DAC O8EP $5.00 ea or 10 for $45 VALVES: 12AV7 $4 1B3GT $5 6J6WA $5 QQV07/50 $15 6SG7 $6 1S2 $3 6AS7 $8 3D21 6U8A 6080WA 6X5GT $6 $6 $9 $5 Phone, mail or fax your orders. Credit cards accepted for orders $20 & over. Mail orders to PO Box 2215, Brookside, Qld 4053. Or shop sales at 143 Grays Rd, Enoggera Qld. Hours: Thursday 4pm-9pm; Sat 9am-4pm. Phone (07) 353 4919, Fax (07) 855 1014. lay8 PCB $10-$20; Z80 Dev. $38-$52; 8K-4Mb Print Buff. $38-$52. Promo Disk for all projects $2. Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043. Phone (03) 338 6286. PRINTED CIRCUIT BOARDS for the hobbyist. For service & enquiries contact: T. A. Mowles (08) 326 5590. Emona Instruments.....................89 E.R. Audio....................................95 Instant PCBs................................95 Jaycar ................................... 45-52 Kalex............................................93 MicroZed Computers...................95 Oatley Electronics.................. 60-61 Pelham........................................95 RCS Radio ..................................94 Rod Irving Electronics .......... 67-71 Secontronics................................96 Silicon Chip Binders....................96 Silicon Chip Bookshop.................23 Silicon Chip Projects Book......OBC WANTED Silicon Chip Wallchart................IBC WANTED: Precission 10-60 American valve tester. Manual required. Ask for Peter. Phone (03) 632 3972. Tortech.........................................77    SILICON CHIP BINDERS These beautifully-made binders will protect your copies of SILICON CHIP. They feature heavy-board covers, are made from a dis­tinctive 2-tone green vinyl & have the SILICON CHIP logo printed in gold-coloured lettering on the spine & cover. To order, just fill in & mail the order form on page 9, or phone or fax your order to: Silicon Chip Publications, PO Box 139, Collaroy Beach, 2097. Phone (02) 979 5644. Fax: (02) 979 6503. 96  Silicon Chip Dick Smith Electronics........... 10-13 Yuga Enterprise...........................95 _________________________________ PC Boards Printed circuit boards for SILICON CHIP projects are made by: • RCS Radio Pty Ltd, 651 Forest Rd, Bexley, NSW 2207. Phone (02) 587 3491. • Marday Services, PO Box 19-189, Avondale, Auckland, NZ. Phone (09) 828 5730. • H. T. Electronics, 35 Valley View Crescent, Hackham West, SA 5163. Phone (08) 326 5590.