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The most recent discussions

Auction in Fremont, ca NOW


March 4, 2021, 5:16 pm

No connection to this, just posting for NorCal bargain hunters. Be quick, lots start closing in 2 hours, around 11AM PST. enjoy, Bill https://bid.xtechauctions.com/auctions/4-1TPJI5/complete-fac... Read more »

favorite LDO?


March 4, 2021, 4:37 pm

Any preferences for a positive low-dropout linear regulator? I'd like Leaded package, preferably no power pad 5v or so max input 1v min adjustable output (low enough for FPGA cores) 500 mA ... Read more »

OT McElligot's Pool


March 3, 2021, 11:03 pm

McElligot's Pool ?This book is dedicated to T.R. Geisel of Springfield Mass., The Worlds Greatest Authority on Blackfish, Fiddler Crabs and Deegel Trout? It can still be found abroad. Here ht... Read more »

Foolproofing open-collector outputs


March 3, 2021, 5:31 pm

Is there a relatively foolproof way to protect open collector outputs against over-voltage/over-current, when they're on terminal blocks that are user accessible? Designed to connect LEDs with li... Read more »

LED driver circuit.


March 3, 2021, 1:59 pm

I have a number of G9 non-dimmable led lamps (230V, 3W, 300lm). One just failed with very low light output, so I thought I'd have a look inside. Other than the led itself, there were only three c... Read more »

OT: proportion of Covid-19 infections which are asymptomatic


March 3, 2021, 4:32 am

Today's Proceedings of the (US) National Academy of Sciences includes a highly technical paper https://www.pnas.org/content/pnas/118/9/e2019716118.full.pdf which happens to include one more estima... Read more »

OT: Why the D614G mutation in the Covid-19 genome makes its strain more inf...


March 3, 2021, 4:07 am

Today's issue of the Proceedings of the (US) National Academy of Sciences has a paper on the conformation of the D614G mutated spike protein. https://www.pnas.org/content/pnas/118/9/e2022586118.full... Read more »

OT: Neanderthal gene that offers proection against getting severe Covid-19


March 3, 2021, 3:34 am

Today's Proceedings of the (US) National Academy of Sciences has a interest ing paper https://www.pnas.org/content/pnas/118/9/e2026309118.full.pdf Quite why the Neanderthals evolved a gene that g... Read more »

OT: climate change tipping points.


March 3, 2021, 3:15 am

Today Proceedings of the (US) National Academy of Science has a somewhat worrying paper https://www.pnas.org/content/118/9/e2017989118 John Larkin really might get his new ice age - actually a re-... Read more »

PSTN interface issues


March 3, 2021, 12:52 am

I have a fancy box that implements a voice attendant for our home phone. Colleagues have duplicated it for use on their home and office phones (whether land line or VoIP). Recently, a colleague t... Read more »

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The best rated discussions

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STmicro acceleration/magnetic sensor LSM303DLH == LIS331DLH + HMC5834?


Just had a look at the LSM303DLH datasheet and had a déjà vu ;-) It looks like ST has simply put a LIS331DLH and a HMC5843 into one package. (The HMC lacks the built-in voltage regulator) All data ar... Read more »

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LT Spice schmitt oscillator

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Does anybody have a working LT Spice netlist for a simple schmitt inverter/R-C oscillator? I tried one using the library schmitt inverter and get obscure sim errors, and I don't understand the HELP ... Read more »

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propagation velocity experiment


This would involve CK722 transistors, slotline samplers, and pecan pralines [1]. Unit of measure would be kiloseconds. Let's see what happens. John [1] The crunchy kind, of course. Only Yankee touris... Read more »

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How to isolate 5V and 12V circuit


Hello everyone, I have extend existing circuit design by adding a 12V relay to it. AT the moment both 5V and 12V circuit are side by side. This doesn't work well. Intermitent device failure happen. I... Read more »

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DSP Device for Guitar Pedal Effect

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I was wondering what DSP chip would be appropriate for a guitar pedal effect. I need to sample the incoming signal preferably at 96kHz perform a simple numeric function upon each sample and output h... Read more »

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rechargeable batteries


Hello How can I charge a rechargeable battery in the lab, what's the 'reverse connection'? Read more »

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Tek TDS 744A -> TDS 784A upgrade hack!


Hi, all, Just wanted to report success in upgrading my TDS 744A scope (500 MHz, 2 gigasamples) to a much swoopier TDS 784A (1 GHz, 4 gigasamples). It now identifies itself as a TDS 784A everywh... Read more »

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EPE TENS circuit.


Would anyone have a circuit for the EPE TENS machine ?. Cheers .... jk Read more »

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Secure PIC programming


Hi We have customers using PICs who sometimes need to re-program them with updated firmware. It's inconvenient to have to ship the equipment back to a service centre, and most customers are quite... Read more »

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Protection circuit to be used for a gate pulse of SCR


Hello, I am doing a project on a temperature control system.My controller has been designed in LabVIEW and I get a control signal of 0-5V output from DAQ which needs to be given as gate pulse to SCR.... Read more »