Recent Posts

1

Projects, Designs, and Technical Stuff / Re: "practically smallest" debug connector on tiny pcb

« Last post by Wilson__ on Today at 10:12:16 pm »

many thanks.  very good thinking.  snap off to 0.1 inch connector and on board hole or poco pin pads at 0.05 inch

2

Projects, Designs, and Technical Stuff / Re: "practically smallest" debug connector on tiny pcb

« Last post by Wilson__ on Today at 10:10:11 pm »

yes, many thanks.  0.05 inch through hole look good.  if one row, it can contact plate through hole with some bend force. swdio, swclk, gnd, vcc, nrst is 5 pins.  the new swo not tried before, is one more pin. Document says spy on the mcu but need graphic programming on the debug pc to extract useful data.  may not be too useful as now.  for luxery, uart tx, rx will be 8.

3

Test Equipment / Re: New EEVblog BM786 Multimeter

« Last post by EEVblog on Today at 10:10:05 pm »

Just received firmware version 78611, MFR# 2411*****. I had no idea there have been so many firmware releases. Wonder what’s new in recent versions.

I'll ask them.

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Projects, Designs, and Technical Stuff / Re: Need a simple circuit for ADC to SPiDF

« Last post by cncjerry on Today at 10:09:42 pm »

To make thing easier, I just need the I2S out of the beaglebone.  I have an old Audio Alchemy DAC and the companion DTI that takes I2S input.  So I just need to figure out the beaglebone and supposedly it is already setup.  I've had this DAC for 30yrs, forgot about it, found it cleaning out the closet where the BBB setup will reside.  Still haven't found my missing HP 15c and 11c calculators. 

Jerry

5

Projects, Designs, and Technical Stuff / Re: Coulomb counter IC for coin cell products.

« Last post by SiliconWizard on Today at 10:07:07 pm »

Needs to be smaller.  Think wearable with tiny PCB.   So like SOT32 / 3x3mm DFN package

Yeah, this only comes in one package that will take about 5x7mm on PCB pads included. It's not huge either. Unfortunately, so far I haven't found anything similar in a smaller package.

Beware that this one is specifically made to monitor primary litihum cells. The BQ27220 mentioned by someone else, and many other such ICs, are made for Li-ion batteries only. This is not the same estimation algorithms at all. Maybe you can still use the latter if you set it up properly or only use a subset of its features, but that'll require reading datasheets very carefully.

The one reference I had otherwise in mind, which is *only* a "coulomb counter" and so would work pretty much with anything that's in the right voltage range is the LTC4150 that i've used before. But it draws too much current for your requirements, and is definitely not very accurate for small current draws.

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Manufacturing & Assembly / Re: tough sheet dielectric material?

« Last post by coppercone2 on Today at 10:07:06 pm »

maybe thin lexan I forgot about that material. Its gotta be one of the better ones. I think for gross high voltage acrylic is better, but thats specialty

I need to order some samples now

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Manufacturing & Assembly / Re: tough sheet dielectric material?

« Last post by DiodeDipShit on Today at 10:06:47 pm »

Lexan is cheap and very rugged, It won't crack like plexiglass.

8

General Technical Chat / Re: Do you think an LED is a resistor?

« Last post by EEVblog on Today at 10:04:57 pm »

Is this one of those trick questions where you pull a small-signal model out of your hat when everyone's distracted or explain later that when you said "resistor" you didn't actually mean resistor?

No, no trick question at all.
I can even show my hand: it is a resistor, a nonlinear resistor to be precise. Why? because its state is determined by the present values of voltage and current (and not their derivatives and integrals like capacitors, inductors, and memristors).

But a lot of people have trouble in recognizing that.

A diode is a resistor in the same way an incandescent lamp is a resistor. Both are nonlinear and both have exponential V-I characteristics. And yet everyone has no problem in computing power dissipated in circuits with incandescent lamp treating them as resistors, while when it comes to diodes the 'hard' exponential seems to create a mental block.

I just wanted to see how widespread this misconception is.

I've seen it taught that as a non-linear resistor for the purposes of calcuation, but it's not a resistor, it's a diode. Try changing the polarity and see what happens.
By your standard diodes are also resistors, or the B-E junction of a transistor is also a resistor, which is silly.

9

RF, Microwave, Ham Radio / Re: WSJT-X on Pi

« Last post by mag_therm on Today at 10:03:45 pm »

Oh, And I was looking at the pi5 with debian 12

Do you have a real computer with debian?

10

FPGA / Re: Lattice has silently removed free iCEcube2 license and now charging $471

« Last post by SiliconWizard on Today at 10:00:59 pm »

How did it work before? For how long was a free license valid? Did it require internet connection to run?

Lattice licensing generally speaking is based on license files that must be renewed every year. You don't need an internet connection to run the tools, but you need one to ask for the license - they send it by mail.