@EwokNightmares @TheNoonMoose I'd guess the diode just wont actually reverse bias in that case.

and even if it did, seems like modeling the steady state as simple resistors would explain it pretty intuitively

I might be way off lol, I would actually just probe it IRL

I think the voltage at the junctions should give you enough to solve for everything else

I analyzed a common emitter circuit anf got the following voltages:

Veb=0.7V

Vce=0.2V

Ic=3.9mA

Ib=23uA

I still can't tell if the transistor is in active mode or saturation. That's totally weird to me.

It's NPN

Maybe hfe is 300?

so in this case it would be in saturation?

I changed base current to 60uA and observed that the collector current only boosted by 0.3mA. So that clearly shows that the bjt is in saturation.

There is quite some attention to user interface details at a few places:

@ThePhoton Just asked my wife. She assures me that you can get horse meat at all of the local butcher shops, though you might have to order it ahead of time.

Thats what I would expcet

Anyone here secretly stockpiling a tray of AD5522's?

Is that this multimeterchip?

@Asmyldof Wow, the data sheet includes a FAX number too

I have a fax number too!

@Marla That doesn't help me much though

I know @Asmyldof. I was just surprised to see a FAX number

all I have are AD532 (multiplier)

Makes the fax number sound better option

wtf are people thinkig, if at al?

"It was actually Anthropomorphous Dodecahedron's Question.It was on hold So I thought of reposting it."

@Marla Can you turn them into pin and feature compatible AD5522's?

@Asmyldof . . . . I might have to go find about 16 DAC chips, and then bypass the AD532.

@PlasmaHH . . . The post was removed by the time I tried to read it

@Asmyldof element14 has 3

newark.com/analog-devices/ad5522jsvdz/…

how many do you need?

@Marla yay

@TheNoonMoose knowing him a bit I would say 32

verical has another five verical.com/pd/…

and there

is some chance these guys aren't full of shit ableelectronics.com/part.php

@TheNoonMoose Many. MANY more

hmpf, damnit, sixxs is closing down :/

@Asmyldof the company i work for, their main business is sourcing and authenticating obsolete and hard to find electrical components

so i can ask a sales guy up front for a favor and find out if he thinks any of the people who claim to have them are likely to actually have them

if you want

@TheNoonMoose It seems just now our manufacturer found some somewhat reliable for $5 more than budgetted, I know my management, don't waste your favours on it

haha alright

i'm the guy who makes sure the shite components they're selling actually work, so they owe me quite a few favors

Who would have thought that an item put on ebay for way too cheap is suddenly nowhere to find in their basement after I bought it seconds later...

@PlasmaHH Russian slaves from the mob have many risks. Didn't know they were traded on eBay now, though.

@PlasmaHH . . Were photographs included on the advertisement on ebay ?

@Marla yep

@Asmyldof the only placewhere nobody would expect them

has anyone hermetically sealed a small aluminum enclosure for a project?

with signal feedthroughs

@EwokNightmares selfmade feedthroughs or bought?

@ThePhoton. . Quick question, quick answer. Good show Sir.

Ooohhhmmm

@JRE Hope you're wife isn't wondering who the heck you are talking to on the internet.

@EwokNightmares How hermetic?

@ThePhoton graviton scale

@PlasmaHH bought. I am looking at a place that provides the feedthroughs as part of the sealing process

@ThePhoton baked and laser welded aluminum

I have a feeling it's not a good choice for what I'm doing

is overkill + costs more + leadtime and reliance on an outside process + can't repair the PCBs

but if it's something like $10-$20 per unit for 200-500 units it might still be considered

it is too many variables for anyone to give a good answer

I feel like the guys who wrote ASF were Java programmers who re-trained to learn C.

Although the amount of commenting is firmly in the C tradition.

@ThePhoton What you need comments for?

@Asmyldof Because I am not a Real Programmer(TM), just a EE faking it.

Most of the ASF code is written for bare-metal speed combined with some manner of usability

Hence the many Macros, which get neatly resolved into constants by your PC

@Asmyldof I found the SERCOM drivers were much more for universality than for speed.

@ThePhoton Then maybe I'm using different ones, or possibly I only looked at the GPIO ones

The USB drivers, I realize there's a lot more that has to happen in there, so expect more code. But still.

@Asmyldof I definitely improved the achievable SPI data rate by re-writing to just use the features I needed instead of trying to do everything.

Anyway, the dirty hack I built does 10Mbit on a 24MHz core without glitches using ASF, so I'm good

If I want it better I'll do it from scratch

Leaving now for an event opening

@ThePhoton I have a question about a circuit. Do you have the time to look at it?

Here's an interesting circuit that I made to turn a LED on for a few seconds. When you hit the button the capacitor charges up to Vcc and then it will start discharging through the base of the transistor. It's a very simple circuit. ibb.co/meOciv

The problem is I want to make it oscillate between on and off state. I have tried different things but failed. I couldn't get it to oscillate. I know I should use some sort of positive feedback but not sure how.

Or google "astable multivibrator" for a hundred other variants.

I know about multivibrator

I just want to make one out of my circuit.

@dirac16 That is the closest thing to your circuit that's going to oscillate.

Or anyway the simplest thing that's close to your circuit that's going to oscillate.

I understand. But if I physically hit the button once every few seconds I have made an oscillator with a low frequency. I should be able to do this using a circuit and some sort of feedback.

@dirac16 An astable multivibrator is a circuit with some kind of feedback.

@ThePhoton Yes, it looks very similar to a multivibrator but anyway can't be re-designed in a different way to oscillate?

@dirac16 At a frequency slow enough to see the LED blinking?

yes

@dirac16 Replace the whole thing with a 555.

Or a schmitt trigger inverter looped back on itself.

please apply your ideas to the circuit I drew! of course, f it's ever possible

@dirac16 I did that at first and came up with the usual astable multivibrator.

Oh, I see. I have been all day long thinking about this circuit. I didn't know it wouldn't be other than a simple multivibrator

@ThePhoton I'm looking at some touch switch circuits. Does my finger have some sort of induced AC voltage from the mains line?