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The most recent discussions

Spice machine on a budget


February 23, 2018, 5:48 pm

Dirt cheap number cruncher: Zotac 880G-ITX AM3 Mini ITX motherboard, eBay, $50: Refurb Phenom II X6 1055T six core processor, eBay, $30-50: Crucial DDR3 1333 4GB, NewEgg, $30: SanDisk 240GB... Read more »

Ping Jeff Lieberman


February 23, 2018, 5:14 pm

Is there any OEM source for laptop enclosures? Specifically the dreaded Dell. I got another hand-me-down Dell laptop where the LCD and guts are fine but the cheap plastic case and keyboard is cr... Read more »

Is it ok to use GBW as a lowpass?

  [ 2 ]
February 23, 2018, 8:26 am

Say I would like to amplify small signals at 100kHz, the opamp has GBW=3MHz, so I set gain to 20 in order to have bandwidth of 150kHz. What *in practice* would happen to a 500kHz signal? The sim a... Read more »

Euro-peon hypocrites....


February 22, 2018, 6:32 pm

Euro-peon hypocrites.... ...Jim Thompson -- If you just accept that everything progressives say is a lie designed for the sole purpose of enhancing... Read more »

EPC GaN fet tiles


February 22, 2018, 5:40 pm

It's sort of suprising that EPC doesn't offer any adapters to help people test their BGA GaN fets, so we made our own. https://www.dropbox.com/s/8fkv6v4cvea1m8m/Gan_Tiles.JPG?raw=1 -- John Larki... Read more »

OT: biohacking


February 22, 2018, 2:40 pm

Taking hacking to a while new level. https://science.slashdot.org/story/18/02/22/0942243/a-biohacker-regrets-publicly-injecting-himself-with-crispr -- Thanks, - Win Read more »

Can rx be calculated from Vn?


February 22, 2018, 5:55 am

In transistor specifications such as these: https://www.nxp.com/docs/en/data-sheet/BFT25A.pdf https://www.nxp.com/docs/en/data-sheet/BFU520A.pdf There is at several frequencies an Rn/50 specificat... Read more »

sealing/whetting current

  [ 2 ]
February 21, 2018, 8:03 pm

Been looking into sealing current for some contacts. With little to go on, I'm swagging 20mA for a goal. But I'm curious why a cap might not also be part of the answer. My thinking is inrush curre... Read more »

Octal eight-bit DAC for 80 cents


February 21, 2018, 3:22 pm

The Rohm BH226F. If it's any good, it could replace a lot of PWMs. https://www.digikey.com/short/qptnn7 Anybody used them? Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant Elec... Read more »

Re: Is the group dead?


February 21, 2018, 2:59 pm

You have books... So you must be a dead poet. ;-) Read more »

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The best rated discussions

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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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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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5

LT Spice schmitt oscillator

  [ 2 ]

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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is the hendershot generator ad a scam?

  [ 2 3 4 ]

is it a scam? Will it work in a residential home ? Read more »

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C programming question for Arduino

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I'm wanting to make timers that work like PLC timers, a condition comes true, a preset period of time later code is executed. It would be something like: void mytimer(bool enable, long preset) void ... Read more »

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Visio logic symbols

  [ 2 ]

Does anyone know of a location from which to download simple logic symbol shapes for Visio (and gate, or gate, etc)? 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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EPE TENS circuit.


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