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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. Coming up in Silicon Chip A switchmode replacement for 78xx series regulators The 78xx series has been around for yonks and is still very useful today. But when there is a high input-output voltage differential, or you need a lot of current, linear regulators generate a lot of heat and have poor efficiency. This small board is a drop-in replacement for a TO-220 package linear regulator. It's up to 96% efficient, needs no heatsinking and has various output voltages from 3.3V to 24V. Advertising Index Altronics...............................23-26 Ampec Technologies................. 41 Control Devices..................... OBC Dave Thompson...................... 111 Digital RF Power Meter This project uses three low-cost modules, two ICs and a handful of passives to create a versatile RF Power Meter which can measure signals from 1MHz to 6GHz ranging from -60dBm to +35dBm. It is housed in a modestly-sized diecast aluminium case and powered via a USB cable. Lidar, SODAR & ADCP Radar and sonar have been around for a long time and most readers will be aware of them. But what about their counterparts, lidar and SODAR? Laserbased lidar systems are becoming more common, being used for mapping areas or for autonomous vehicle obstacle avoidance. SODAR is used for wind profiling at places like airports, while ADCP measures underwater currents. Dr David Maddison describes all three in detail, plus some related technologies. Digi-Key Electronics.................... 3 Emona Instruments................. IBC Jaycar............................ IFC,53-60 Keith Rippon Kit Assembly...... 111 LD Electronics......................... 111 LEDsales................................. 111 Microchip Technology................ 15 USB SuperCodec Ocean Controls........................... 5 If you want to record and play back audio with extremely high fidelity, or measure the performance of a wide range of audio equipment including amplifiers then this project is for you. It’s a 192kHz, 24-bit stereo USB sound card with impeccable performance and it can be combined with some low-cost software to measure distortion, signal-to-noise ratios, frequency responses and other audio device parameters. RayMing PCB & Assembly.......... 4 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The August 2020 issue is due on sale in newsagents by Thursday, July 30th. Expect postal delivery of subscription copies in Australia between July 28th and August 14th. Silicon Chip PDFs.................... 75 Silicon Chip Shop...............98-99 Silicon Chip Subscriptions....... 95 The Loudspeaker Kit.com........... 7 Vintage Radio Repairs............ 111 Wagner Electronics..................... 9 Notes & Errata H-Field Transanalyser, May 2020: the frequency counter module part number is miswritten as PJL-6LED on pages 40, 42 and 44. The correct part code is PLJ-6LED. Nutube Guitar Overdrive & Distortion Pedal, March 2020: the Jaycar Cat PS0190 jack socket specified in the parts list is too tall to fit. Jaycar Cat PS0195 is a better fit, but some plastic must be filed off the jack for the adjacent relay to fit properly. Also, it’s best to install the 100µF capacitor next to the socket after the socket itself. Super-9 FM Radio, November & December 2019: the NXP BB156 Varicap diode used in this project is being discontinued. While it is currently still available, should it become difficult to source, the Toshiba 1SV304TPH3F is a suitable substitute. Ultra Low Noise Remote Controlled Stereo Preamp, March & April 2019: on page 44 of the April 2019 issue, endstop adjustment trimpot VR4 is incorrectly referred to in several places in the text as VR2. 112 Silicon Chip Australia’s electronics magazine siliconchip.com.au