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Coming up in Silicon Chip Touchscreen GPS Frequency Reference This new GPS-disciplined frequency reference has three outputs which can be programmed to produce just about any frequency from 1.2MHz up to around 100MHz, as well as a disciplined 1pps output. It uses a temperature-compensated crystal oscillator inside an oven for maximum stability. Designing the Cleverscope CS448 It took more than five years to go from idea to product and designer Bart Schroder ran into quite a few hurdles along the way, including ICs which didn’t do what they were supposed to! The end result is a circuit which meets all of the strict initial design criteria. This is the story of how he achieved that. Advertising Index Altronics............................. 68-71 AEE Electronex...................... 41 Cleverscope............................ 46 Control Devices...................... 47 Dave Thompson................... 111 Digi-Key Electronics................. 3 Useless Box Electrolube............................. 48 We try to design useful devices but here is a project which, if built properly, is not only totally useless, it’s so advanced that it’s especially useless! Well, maybe that isn’t strictly true since it provides a source of amusement, especially for kids. Emona Instruments.............. IBC Introduction to programming the Cypress CY8CKIT Jaycar......................... IFC,53-60 This low-cost module incorporates a 32-bit microcontroller and a set of reprogrammable analog circuitry which can be used for a wide range of tasks. In this article we show you how to use the CY8CKIT-049 as a thermometer. Four-channel DC Fan and Pump Controller An updated speed controller for DC fans and pumps which runs from a 12V supply, can switch up to 40A of fans and/or pumps based on temperatures from up to four sensors. It’s configured over a USB interface and can also provide real-time feedback on its operation. Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The October 2018 issue is due on sale in newsagents by Thursday, September 27th. Expect postal delivery of subscription copies in Australia between September 25th and October 12th. Notes & Errata Wide-range Digital LC Meter, June 2018: we forgot to mention in this article that the software may need to be modified if your I2C LCD module has a different address. The default address used is 0x27 which suits an I2C board using the PCF8574T IC and no jumper options set. If your I2C module uses a PCF8574AT IC, you will need to change that address (on line 14 of the sketch) to 0x3F. We are in the process of developing a new version of the sketch which will automatically detect the display address. Once we have released that, you should not need to make any changes regardless of the I2C address your module uses. Low-cost Automotive Ammeter, Circuit Notebook, June 2018: while not strictly necessary, it is a good idea to add two 2.2µF 16V Tantalum capacitors, across the inputs and outputs of the Mornsun Switchmode Converter to reduce hash (see the data sheet for more details). El Cheapo Modules 16 – ADF4351 4.4GHz digitally controlled oscillator, May 2018: a reader identified a bug in the code which caused the output frequency to be wrong in some cases (see the Mailbag section for more details). Revised software is available for download from the Silicon Chip website which fixes this bug. 6GHz+ Touchscreen Frequency Counter, October-December 2017: the power ground connection for op amp IC9 is made to pin 4 in both the circuit diagram and on the PCB but it should be to pin 5 instead. This can be fixed after assembling the board by running a short length of fine wire between pins 4 and 5 of the IC package. This will be fixed in the RevC PCB. 112 Silicon Chip Australia’s electronics magazine Hare & Forbes.................... OBC Keith Rippon Kit Assembly... 111 Keysight Technologies............ 49 LD Electronics...................... 111 LEACH Co Ltd........................ 45 LEDsales.............................. 111 Master Instruments................... 5 Mastercut Technologies.......... 44 Microchip Technology.......... 7,77 Mouser................................... 11 Ocean Controls........................ 8 OmberTech........................... 111 PCBcart................................ 31 Rohde & Schwarz................... 51 Silicon Chip Shop......... 104-105 Silicon Chip Subscriptions.... 40 Silicon Chip RTV&H DVD.... 109 TRI Components.................... 39 The Loudspeaker Kit.com....... 63 Tronixlabs............................. 111 Vintage Radio Repairs......... 111 Wagner Electronics.................. 9 siliconchip.com.au