Silicon ChipThe Fox Report - March 2021 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Subscriptions: PE Subscription
  4. Subscriptions: PicoLog Cloud
  5. Back Issues: PICOLOG
  6. Publisher's Letter
  7. Feature: The Fox Report by Barry Fox
  8. Feature: Techno Talk by Mark Nelson
  9. Feature: Net Work by Alan Winstanley
  10. Project: Nutube Guitar Overdrive and Distortion Pedal by John Clarke
  11. Project: Programmable Thermal Regulator by Tim Blythman and Nicholas Vinen
  12. Project: Tunable HF Preamplifier with Gain Control by Charles Kosina
  13. Feature: Circuit Surgery by Ian Bell
  14. Feature: Make it with Micromite by Phil Boyce
  15. Feature: PICn’Mix by Mike Hibbett
  16. Feature: Max’s Cool Beans by Max the Magnificent
  17. Feature: Max’s Cool Beans cunning coding tips and tricks by Max the Magnificent
  18. Feature: AUDIO OUT by Jake Rothman
  19. PCB Order Form
  20. Advertising Index: TEACH-IN by Max the Magnificent

This is only a preview of the March 2021 issue of Practical Electronics.

You can view 0 of the 72 pages in the full issue.

Articles in this series:
  • (November 2020)
  • Techno Talk (December 2020)
  • Techno Talk (January 2021)
  • Techno Talk (February 2021)
  • Techno Talk (March 2021)
  • Techno Talk (April 2021)
  • Techno Talk (May 2021)
  • Techno Talk (June 2021)
  • Techno Talk (July 2021)
  • Techno Talk (August 2021)
  • Techno Talk (September 2021)
  • Techno Talk (October 2021)
  • Techno Talk (November 2021)
  • Techno Talk (December 2021)
  • Communing with nature (January 2022)
  • Should we be worried? (February 2022)
  • How resilient is your lifeline? (March 2022)
  • Go eco, get ethical! (April 2022)
  • From nano to bio (May 2022)
  • Positivity follows the gloom (June 2022)
  • Mixed menu (July 2022)
  • Time for a total rethink? (August 2022)
  • What’s in a name? (September 2022)
  • Forget leaves on the line! (October 2022)
  • Giant Boost for Batteries (December 2022)
  • Raudive Voices Revisited (January 2023)
  • A thousand words (February 2023)
  • It’s handover time (March 2023)
  • AI, Robots, Horticulture and Agriculture (April 2023)
  • Prophecy can be perplexing (May 2023)
  • Technology comes in different shapes and sizes (June 2023)
  • AI and robots – what could possibly go wrong? (July 2023)
  • How long until we’re all out of work? (August 2023)
  • We both have truths, are mine the same as yours? (September 2023)
  • Holy Spheres, Batman! (October 2023)
  • Where’s my pneumatic car? (November 2023)
  • Good grief! (December 2023)
  • Cheeky chiplets (January 2024)
  • Cheeky chiplets (February 2024)
  • The Wibbly-Wobbly World of Quantum (March 2024)
  • Techno Talk - Wait! What? Really? (April 2024)
  • Techno Talk - One step closer to a dystopian abyss? (May 2024)
  • Techno Talk - Program that! (June 2024)
  • Techno Talk (July 2024)
  • Techno Talk - That makes so much sense! (August 2024)
  • Techno Talk - I don’t want to be a Norbert... (September 2024)
  • Techno Talk - Sticking the landing (October 2024)
  • Techno Talk (November 2024)
  • Techno Talk (December 2024)
  • Techno Talk (January 2025)
  • Techno Talk (February 2025)
  • Techno Talk (March 2025)
  • Techno Talk (April 2025)
  • Techno Talk (May 2025)
  • Techno Talk (June 2025)
The Fox Report Barry Fox’s technology column Fakes, scams and evasion C ovid has provided a golden opportunity for scammers to con the unwary – and even the wary. I bought a 2TB USB stick memory which turned out to be a fake. I have since learned that the crooks are using a controller unit which gives a false reading for whatever memory chips it is bonded to. So, using a PC to check capacity is no guide. Soon afterwards I was stung by a 2TB portable HDD which also failed to store as much data as it should have done. In each case I was able to return the purchase and ask for a full refund. But in each case I lost data. Price is not necessarily a reliable guide to fakery because the faker may charge a high price to create false confidence. Fortunately, there are several free software tools now available, such as H2testw or FakeFlashTest. The downside is that they can take days to fully check a large capacity store. Plus, they may lock up when they hit a capacity problem. On the face of things, fully formatting a new drive (not quick formatting) should show its true capacity. But it is possible the fakers can – or will soon – fake that too. Once a faking chip is available there is no way of limiting who uses it. This probably explains why there are so many 2TB fakes around. Arguably the safest guide to genuine quality is the brand name. This can of course also be faked, but phoney products will usually look cheap and phoney. So, buy memory USBs and HDDs from a source which has a friendly return-and-refund policy that costs only the price of the paper and ink needed to print a pre-paid label. 1557 IP68 sealed enclosures Answer or ignore? The scammers are also having a field day with scam phone calls, texts and emails. Phone calls are easy and fun to prolong if you have some time to spare. Just give no personal details and keep the scammer talking to eat into the time they have to call other, perhaps more gullible targets. Be wary of replying to scam emails and texts, however much fun it might seem to be, because you are just confirming that your ID address is ‘live’. I was recently shocked to hear absurdly bad advice on scam emails given out by a so-called expert on a morning BBCTV programme. Talking about online scams, he advised that if anyone gets a scam email, then they should ‘change their password’. The fact that a scammer knows your email does not of course mean that they have access to your email account. It simply means that they have harvested your email from any one of countless possible sources. Most people get multiple scam emails every day, so anyone taking the BBC’s ‘expert’ advice would be changing their password several times a day; and changing an email password does not stop scam emails arriving. ! w ne Learn more: hammfg.com/1557 Contact us to request a free evaluation sample. uksales<at>hammfg.com • 01256 812812 8 Practical Electronics | March | 2021 I contacted the BBC who waffled that the ‘expert’ was ‘simply offering one way that a person can protect themselves, but we appreciate you did not agree with this advice.’ I have now suggested that the BBC ask its own IT Department to confirm that it is not a matter of opinion but fact that advising people to change their password when they receive a scam email is downright wrong; and it is doubly worrying that an ‘expert’ advising millions is not willing to admit and correct a mistake. A great big non-answer As recently reported (Fox Report, February 2021) I asked the chief executive of the Advertising Standards Authority, Guy Parker, for his personal views on the ASA’s competence to handle consumer complaints about adverts with technical content; and I promised to report back on any response. With considerable difficulty I did eventually squeeze a personal response from Guy Parker, which reads: ‘I recognise your frustration about our newish complaint handling procedures, but my colleagues, including members of my Senior Management Team with responsibility for our Complaints and Investigations operation, have taken time carefully and thoughtfully to respond to your concerns, including committing to review our procedures in light of your helpful feedback. I’ve nothing to add to that. ‘I disagree that the ASA is illequipped to judge ad claims for consumer technology products and services. On the contrary, we have a great deal of experience judging such claims. ‘While it’s obvious that our responses have not satisfied you, there’s not much we can do about that and I see nothing to be gained from continuing to correspond. I therefore consider the matter closed and I won’t be replying if you choose to write to me again.’ products and services that we now see in the media; see: http://bit.ly/ pe-mar21-asa1 Readers can also search online for any technical credentials among the ASA’s management here: http://bit. ly/pe-mar21-asa2 In the meantime, I have filed another tech-related complaint, regarding commercial promotion of consumer tech products by a consumer tech TV personality. So, I can report firsthand that, thus far, there is no sign of the procedural changes needed to keep consumers informed on the progress – or silent dismissal – of their complaints. This is two full months after the ASA said it would ‘look to implement something’ based on my ‘very helpful suggestion’. Check for yourself 5-year collection 2015-2019 PE readers can look for themselves at recent ASA rulings, and form their own opinions on whether the number that relate to adverts with a technical slant reasonably reflects the plethora of adverts for tech-based NEW DOWNLOAD! Purchase and download at: www.electronpublishing.com STEWART OF READING 17A King Street, Mortimer, near Reading, RG7 3RS Telephone: 0118 933 1111 Fax: 0118 933 2375 USED ELECTRONIC TEST EQUIPMENT Check website www.stewart-of-reading.co.uk Fluke/Philips PM3092 Oscilloscope 2+2 Channel 200MHz Delay TB, Autoset etc – £250 LAMBDA GENESYS LAMBDA GENESYS IFR 2025 IFR 2948B IFR 6843 R&S APN62 Agilent 8712ET HP8903A/B HP8757D HP3325A HP3561A HP6032A HP6622A HP6624A HP6632B HP6644A HP6654A HP8341A HP83630A HP83624A HP8484A HP8560E HP8563A HP8566B HP8662A Marconi 2022E Marconi 2024 Marconi 2030 Marconi 2023A PSU GEN100-15 100V 15A Boxed As New £400 PSU GEN50-30 50V 30A £400 Signal Generator 9kHz – 2.51GHz Opt 04/11 £900 Communication Service Monitor Opts 03/25 Avionics POA Microwave Systems Analyser 10MHz – 20GHz POA Syn Function Generator 1Hz – 260kHz £295 RF Network Analyser 300kHz – 1300MHz POA Audio Analyser £750 – £950 Scaler Network Analyser POA Synthesised Function Generator £195 Dynamic Signal Analyser £650 PSU 0-60V 0-50A 1000W £750 PSU 0-20V 4A Twice or 0-50V 2A Twice £350 PSU 4 Outputs £400 PSU 0-20V 0-5A £195 PSU 0-60V 3.5A £400 PSU 0-60V 0-9A £500 Synthesised Sweep Generator 10MHz – 20GHz £2,000 Synthesised Sweeper 10MHz – 26.5 GHz POA Synthesised Sweeper 2 – 20GHz POA Power Sensor 0.01-18GHz 3nW-10µW £75 Spectrum Analyser Synthesised 30Hz – 2.9GHz £1,750 Spectrum Analyser Synthesised 9kHz – 22GHz £2,250 Spectrum Analsyer 100Hz – 22GHz £1,200 RF Generator 10kHz – 1280MHz £750 Synthesised AM/FM Signal Generator 10kHz – 1.01GHz £325 Synthesised Signal Generator 9kHz – 2.4GHz £800 Synthesised Signal Generator 10kHz – 1.35GHz £750 Signal Generator 9kHz – 1.2GHz £700 HP/Agilent HP 34401A Digital Multimeter 6½ Digit £325 – £375 HP 54600B Oscilloscope Analogue/Digital Dual Trace 100MHz Only £75, with accessories £125 (ALL PRICES PLUS CARRIAGE & VAT) Please check availability before ordering or calling in HP33120A HP53131A HP53131A Audio Precision Datron 4708 Druck DPI 515 Datron 1081 ENI 325LA Keithley 228 Time 9818 Practical Electronics | March | 2021 Marconi 2305 Modulation Meter £250 Marconi 2440 Counter 20GHz £295 Marconi 2945/A/B Communications Test Set Various Options POA Marconi 2955 Radio Communications Test Set £595 Marconi 2955A Radio Communications Test Set £725 Marconi 2955B Radio Communications Test Set £800 Marconi 6200 Microwave Test Set £1,500 Marconi 6200A Microwave Test Set 10MHz – 20GHz £1,950 Marconi 6200B Microwave Test Set £2,300 Marconi 6960B Power Meter with 6910 sensor £295 Tektronix TDS3052B Oscilloscope 500MHz 2.5GS/s £1,250 Tektronix TDS3032 Oscilloscope 300MHz 2.5GS/s £995 Tektronix TDS3012 Oscilloscope 2 Channel 100MHz 1.25GS/s £450 Tektronix 2430A Oscilloscope Dual Trace 150MHz 100MS/s £350 Tektronix 2465B Oscilloscope 4 Channel 400MHz £600 Farnell AP60/50 PSU 0-60V 0-50A 1kW Switch Mode £300 Farnell XA35/2T PSU 0-35V 0-2A Twice Digital £75 Farnell AP100-90 Power Supply 100V 90A £900 Farnell LF1 Sine/Sq Oscillator 10Hz – 1MHz £45 Racal 1991 Counter/Timer 160MHz 9 Digit £150 Racal 2101 Counter 20GHz LED £295 Racal 9300 True RMS Millivoltmeter 5Hz – 20MHz etc £45 Racal 9300B As 9300 £75 Solartron 7150/PLUS 6½ Digit DMM True RMS IEEE £65/£75 Solatron 1253 Gain Phase Analyser 1mHz – 20kHz £600 Solartron SI 1255 HF Frequency Response Analyser POA Tasakago TM035-2 PSU 0-35V 0-2A 2 Meters £30 Thurlby PL320QMD PSU 0-30V 0-2A Twice £160 – £200 Thurlby TG210 Function Generator 0.002-2MHz TTL etc Kenwood Badged £ 6 5 Function Generator 100 microHz – 15MHz Universal Counter 3GHz Boxed unused Universal Counter 225MHz SYS2712 Audio Analyser – in original box Autocal Multifunction Standard Pressure Calibrator/Controller Autocal Standards Multimeter RF Power Amplifier 250kHz – 150MHz 25W 50dB Voltage/Current Source DC Current & Voltage Calibrator £350 £600 £350 POA POA £400 POA POA POA POA Marconi 2955B Radio Communications Test Set – £800 9