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MARKET CENTRE Cash in your surplus gear. Advertise it here in SILICON CHIP FOR SALE PCB PRODUCTION KIT ASSEMBLY & REPAIR tronixlabs.com.au – Australia's best value for supported hobbyist electronics from Adafruit, SparkFun, Arduino, Freetronics, Raspberry Pi – along with kits, components and much more – with same-day shipping. Trouble buying old components? Need to re-spin an obsolete PCB? We do PCB layouts from files, drawings or samples. Contact Steve at sgobrien8<at>gmail. com or phone 0401 157 285. Get your old PCBs updated and keep production going! DAVE THOMPSON (the Serviceman from SILICON CHIP) is available to help you with kit assembly, project troubleshooting, general electronics and custom design work. No job too small. Based in Christchurch, NZ but service available Australia/NZ wide. Email dave<at>davethompson.co.nz PCBs MADE, ONE OR MANY. Any format, hobbyists welcome. Sesame Electronics Phone 0434 781 191. nev-sesame<at>outlook.com www.sesame.com.au VINTAGE RADIO REPAIRS: electrical mechanical fitter with 36 years ex­ perience and extensive knowledge of valve and transistor radios. Professional and reliable repairs. All workmanship guaranteed. $17 inspection fee plus charges for parts and labour as required. Labour fees $38 p/h. Pensioner discounts available on application. Contact Alan, VK2FALW on 0425 122 415 or email bigalradioshack<at>gmail. com LEDs, BRAND NAME and generic LEDs. Heatsinks, fans, LED drivers, power supplies, LED ribbon, kits, components, hardware, EL wire. www.ledsales.com.au PCB MANUFACTURE: single to multi­ layer. Bare board tested. One-offs to any quantity. 48 hour service. Artwork design. Excellent prices. Check out our specials: www.ldelectronics.com.au KEITH RIPPON KIT ASSEMBLY & REPAIR: * Australia & New Zealand; * Small production runs. Phone Keith 0409 662 794. keith.rippon<at>gmail.com ADVERTISING IN MARKET CENTRE Classified Ad Rates: $32.00 for up to 20 words (punctuation not charged) plus $1.20 for each additional word. Display ads in Market Centre (minimum 2cm deep, maximum 10cm deep): $82.50 per column centimetre per insertion. All prices include GST. Closing date: 5 weeks prior to month of sale. To book, email the text to silicon<at>siliconchip.com.au and include your name, address & credit card details, or phone Glyn (02) 9939 3295 or 0431 792 293. The Philips Compact Cassette . . . continued from page 33 selected “normal” 120µs (ie, a standard ferric oxide) tape. I found some “junk box” tapes to be pretty awful. The record level meter is reliable, with an acceptable 3% distortion level corresponding to the centre of the red zone. Speed constancy is specified in two ways: wow (slow variations up to 5Hz), and flutter (variations from 5Hz to 30Hz). Wow measured at 0.3%, flutter at 0.4%. I expected better and suspect variations in holdback tension as the main cause. There was also a definite “flanging” effect (for anyone who remembers “Itchycoo Park”) siliconchip.com.au that’s consistent with tape slewing across the playback head. Playback speed was constant down to a supply voltage of 4.7V. EL3302 versions There are the preceding EL3300/ 3301, distinguished mainly by a white plastic operation lever, and the following EL3303. Several variants of the EL3302 were produced around the world. The basic mechanism was widely re-badged by European (Telefunken, Siera), US (Norelco, Mercury, Wollensak) and Japanese (Panasonic) manufacturers, among others. Australia’s electronics magazine Further reading For the EL3302, see: www.petervis.com/ Cassette_Tape_Recorders/ and look for the EL3302 – as well as the user manual, Peter has an extensive description complete with great photos. For general references, see: en.wikipedia. org/wiki/Compact_Cassette For a more complete discussion, see: siliconchip.com.au/link/aaj2 On bias, (a quick summary), see: siliconchip.com.au/link/aaj3 For a detailed discussion of bias, see: www.hccc.org.uk/acbias.html SC July 2018  103