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
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