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Advertising Index Altronics.................................... 80-83 Dyne Industries.............................. 95 Element14...................................... 21 Emona Instruments........................ 79 Geoff Coppa................................. 111 Grantronics.................................. 111 Hare & Forbes............................... 2-3 High Profile Communications....... 111 Instant PCBs................................ 111 DOWNLOAD OUR CATALOG at www.iinet.net.au/~worcom WORLDWIDE ELECTRONIC COMPONENTS PO Box 631, Hillarys, WA 6923 Ph: (08) 9307 7305 Fax: (08) 9307 7309 Email: worcom<at>iinet.net.au Ask SILICON CHIP . . . continued from p109 the reference oscillator and the volume oscillator are so close that they lock and so hand movement does not cause the volume oscillator to change. To counteract this, adjust the reference volume oscillator transformer (T3) about one turn either clockwise or anticlockwise from its current position and then readjust T4 again according to the volume plate alignment procedure described in the article. Alternatively, T3 and T4 are currently adjusted so that T4 cannot come within frequency range of the T3 oscillator. Try setting both the T3 and T4 slugs to mid-travel of their adjustment range first. Then readjust FK708 AM Radio Kit Ideal classroom project or just for fun. Simple construction Includes amplifier and speaker Shelf & pocket cases available Value!!! $15.27 For this kit and (inc GST) Plus $6.45 P & P hundreds more like it, shop on-line at: www.kitstop.com.au electronics - the fun starts here T4 again according to the volume plate alignment procedure described in the article. There must be a voltage change available at D1 with hand movement before volume will be controlled. The August 2000 Theremin will work well with an earthed or unearthed supply. It does not work with the newer switchmode plugpacks. The later Mk.2 version from March 2009 was designed to operate from an AC plugpack only. It will not operate from a DC supply or a switchmode plugpack. The Ask SILICON CHIP answer you are referring to was probably for the Mk.2 version. March 2012 Multi-Channel USB Recording/Playback Interface? I was very happy to see the USB stereo recording/playback interface project (SILICON CHIP, June 2010) and was wondering how I can have multiple channels for music creation/production at home. For example, I want to have eight or more inputs for use with Cubase software. So, can I run four of your boxes on a desktop PC? Is there any chance of you doing a multi-channel version for home studios? Commercial units are too expen112  Silicon Chip sive for a home hobbyist. (D. C., via email). • Unfortunately it’s not feasible to hook up four of our Stereo USB recording/Playback Interfaces to a PC for 8-channel recording. In order to do this, you’d need an ADC-bitstream chip which could handle all eight channels at once and interleave them “in sync” for sending to the PC. That’s probably the reason why the commercial units are so expensive. Jaycar ................................ IFC,49-64 Keith Rippon................................. 111 Kitstop.......................................... 112 LED Sales.................................... 111 LHP.NET.AU................................. IBC Microbee Technology................... 111 Microchip Technology....................... 5 Mikroelectronika............................. 11 Mouser Electronics.................... OBC Ocean Controls.............................. 23 Quest Electronics......................... 111 RF Modules.................................. 112 Sesame Electronics..................... 111 Sethna Electronics....................... 111 Silicon Chip Binders........... 78,95,112 Silicon Chip Bookshop................. 110 Silicon Chip Order Form................ 43 Silicon Chip Partshop..................... 42 Silicon Chip Subscriptions............. 89 Siomar Battery Engineering.... 15,111 Splat Controls.............................. 111 Switchmode Power Supplies.......... 47 Tekmark......................................... 13 Truscotts Electronic World............ 111 Verbatim......................................... 22 Wiltronics......................................... 9 Worldwide Elect. Components..... 112 siliconchip.com.au