's profile
Analog Consultant

James Bryant was European Applications Manager for Analog Devices for over a quarter of a century, and is a well-known lecturer on analog electronics. He is the author of many articles, papers and application notes on analog electronics, of many of Analog Devices'Technical Seminars, and of about a third of their monthly"Rarely Asked Questions"columns.

Despite his retirement he still lectures frequently on analog electronics, hypnotism and radio, and is experienced in lecturing in English to audiences whose native language is not English. His website may be found at www.jbryant.eu/home-eng.htm

His interests include Amateur Radio (callsign G4CLF), Cooking, Electronics, Hypnotism, Literature (especially Science Fiction), Music, Philosophy, Scuba Diving, Sailing and Travel.


's contributions
  • 01.04.2018
  • The Shadowbox Suffusion: LED project #2
  • If you limit the charge voltage to 4.0V instead of 4.2V you will get ~20% reduction of capacity but the battery life will increase from 500 to over 5000 charge/discharge cycles. The audiophiles can use a +12V anode supply as well as a 12V heater supply if they're careful in their design & choice of tubes and don't expect much output power.
  • 12.13.2017
  • Sensing body dehydration
  • Dehydration is a serious condition and this technique may well be a useful way of monitoring it. But to suggest that many of us are wandering around in a damaging state of sub-clinical dehydration is an urban myth, promoted by soft drink and bottled water manufacturers, which has been denied by most medical researchers who have studied the hydration of healthy people. See https://www.snopes.com/medical/myths/8glasses.asp
  • 10.26.2017
  • Simple 3.3V power backup supply: ADI Power by Linear Design Note
  • Electrolytic capacitors are inexpensive, but very cheap ones are unreliable. And in this application a failed capacitor may not be detected until the circuit is needed - when it is too late! While I appreciate that you use the description "low cost electrolytic capacitor" to differentiate the energy storage from much more expensive batteries or supercapacitors I do suggest that you should emphasise that the electrolytic capacitor chosen should be a high reliability one rather than the cheapest available.
  • 08.03.2017
  • Dead meters expose battery terminal design issues
  • No comments on the battery corrosion issue, but I would suggest that while every lab needs a good DVM, it also needs a handful of cheap DVMs. The basic Chinese 830B can be had for as little as $3 post free from China on eBay and it does what it's advertised to do. 2½ digit resolution (but only 5% accuracy) and not extremely reliable. But at that price it's a disposable. I give 'em away in handsful to folks who should own some sort of meter but don't. http://jbryant.eu/pages/DMM.htm
  • 12.17.2016
  • Magnetic sensor stabilizes drone designs
  • This is a very useful product, but it is irresponsible to announce a product as "available" if the announcement states that the data sheet is not yet available - how can we use it if we don't know how to connect it, nor how it will behave if we do?
  • 05.14.2013
  • Bender senses shocks
  • I live beside the sea. Even high-priced "salt-water resistant" doorbell pushes last for less than a year before failing, so I have a large brass knocker on my front door. But we cannot hear it throughout the house - so I have one of these piezo-ceramic discs cemented to the inside of the door behind the knocker, and a cheap, non-waterproof, radio doorbell transmitter is triggered by it. No corrosion and it's been working for several years.
  • 10.13.2016
  • The speed of thought
  • If an ignorant Brit is not mistaken it is 60' from the pitcher to the catcher. If the ball travels this in 0.2 seconds it is moving at 300 fps or approximately 205 mph. According to Wikipedia the record (held by Aroldis Chapman) is actually 105 mph, so since few pitchers make that speed the time is actually more likely to be in the range 0.5-0.7 seconds.