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Coming up in Silicon Chip Advertising Index Vintage TV RF Modulator Altronics.................................. 74-77 This circuit allows you to drive a vintage TV from a composite video source such as a DVD player. It is optimised to provide the best video quality for older TVs and incorporates vertical blanking removal circuitry to avoid buzzing noises from the TV's sound decoder. It uses six ICs and some discrete and passive components. Dave Thompson......................... 103 El Cheapo Modules - ESP8266 WiFi modules and boards High Profile Communications..... 103 We've used ESP8266/ESP32 modules and boards in a few of our projects now. They are ideal for any microcontroller-based project which requires internet access. This article will provide more detail on what's available. Triac-based Motor Speed Controller We've published many mains motor speed controllers in the past, including several based on Triacs but this is our best yet. It avoids many of the pitfalls of Triac-based controllers and gives very smooth speed control, including operation at very low speeds. It's relatively simple and quite easy to build, too. Digi-Key Electronics....................... 3 Emona Instruments.................... IBC Hare & Forbes.......................... OBC Icom Pty Ltd................................. 13 Jaycar............................... IFC,49-56 Keith Rippon Kit Assembly......... 103 LD Electronics............................ 103 LEACH Co Ltd................................ 9 LEDsales.................................... 103 Microchip Technology..................... 7 Earthquake Early Warning It's possible to get early warning before a devastating earthquake by sensing the "P waves" which travel through the Earth faster than the damaging "S waves". It could give you 30 seconds or even a minute to get to a safe place. This article describes the electronics required to form an early warning system. Ocean Controls............................ 11 Rohde & Schwarz.......................... 5 Sesame Electronics................... 103 SC Online Shop.................. 100-101 AM Transmitter for Vintage Radios AM radio stations may start to disappear in a few years. If that happens, you will need a low-power AM radio transmitter such as this one to continue enjoying vintage radios. It's also handy for playing MP3s or CDs through an AM radio. Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The March 2018 issue is due on sale in newsagents by Thursday, February 22nd. Expect postal delivery of subscription copies in Australia between February 22nd and March 9th. SC Radio, TV & Hobbies DVD...... 96 Silicon Chip Binders.................... 10 Silicon Chip Subscriptions........ 102 The Loudspeaker Kit.com.............. 6 Tronixlabs................................... 103 Vintage Radio Repairs............... 103 Wagner Electronics...................... 35 Notes & Errata UV Light Box & Timer, November 2007: the errata in the August 2008 issue regarding this project is wrong. There is no 47kW resistor (it’s 4.7kW) and it should not be installed. The three 10kW pull-up resistors mentioned in the March 2012 errata should be fitted instead. These can be soldered between the following pairs of IC pins on the underside of the board: pins 3 & 4, pins 12 & 14, pins 13 & 14. Micromite BackPack Touchscreen DDS Signal Generator, April 2017: add three chassis-mount RCA sockets to the parts list. Deluxe Touchscreen eFuse, July, August & October 2017: in the circuit diagram (Fig.3) on pages 44 and 45 of the July 2017 issue, the resistors connecting to pins 24 and 26 of IC1 are shown incorrectly. The 390kW/30kW and 27kW/3kW pairs should be swapped. The same is true of the overlay diagram on page 63 of the August 2017 issue. The resistors to swap are above REG3 (390kW) and just above Q4 (30kW), and to the right of REG1 (27kW) and above and to the left of REG3 (3kW). Also, the PCB overlay incorrectly shows ZD8 (just above Q6) as ZD4. The PCBs supplied are correctly labelled and the online versions of these issues have been corrected. Kelvin the Cricket, October 2017: there is a bug in the software which prevents modes 13-16 from working properly. Revised firmware (0810917B) is available for download from the Silicon Chip website and chips supplied from now on will be programmed with this new version. 104 Silicon Chip Celebrating 30 Years siliconchip.com.au