So I have set up a little experiment which involves a HDD BLDC Motor, a scope and a multimeter. Is it possible to determine the inductance of a phase by the voltage it produces?
Does anyone here know why a waveform 'shivers' on an oscilloscope when in auto-mode - even if the trigger is properly set? My SPI clock does this but MOSI/MISO don't. But other circuits, like development boards, have a very clean clock and they don't 'shiver' at all.
@saad If the scope is in auto triggering mode, and the signal is just irregular or just intermittent enough then it might appear that the triggering isn't quite working right.
@DavidKessner Thought, it does trigger OK on other circuits. Could this possibly be a noise issue where the scope isn't sure where to trigger due to some added noise in the signal?
@saad If you flip between auto and normal triggering mode and it works well in normal mode but not auto then the problem is because of the expected behavior of auto mode. If it doesn't work then the problem is with triggering level, noise, or some other problem.
@DavidKessner honestly, getting a severance if I did not get the job and a good luck would just give me money to cover looking for other jobs for a while. Would be just as good. Who really cares?
@W5VO thanks! I am looking at the circuit below, granted they are not MOSFETS, but I don't see how circuit two provides vdd to the negative plate on cap.
I was trying to understand the charge pump which generates a negative voltage. As far as I understood, the basic operation is as follows:
SquareWaveInput is a 0 to 5V, 10kHz square wave. When the input is high, Q1 is ON and Q2 is OFF. Q1 charges C1 through D1 back to supply.
D2 is reverse biased...
The title gets it mostly. On EE.SE we have recently given out a few suspensions and in almost every case they attempted to make a sock puppet and continue with their previous behavior.
If a flag had been raised for moderators of the existence of the account we could have been watching and prepar...
@W5VO I just hate having to spend money on a trip I might not really have the money for. If I get the promotion and all the tickets fall to 120, i am going to all three days, but I am not hopeful.
@Kortuk i was planning to go to the abbey to buy me some bottles of the oak aged quadruple stuff, to drink during the weekend because I'm going on holiday on monday
@Kortuk I just realized that I have to work all weekend :-(
@W5VO But I'm guessing that so many people were fed up with the whole GABF ticket thing, and not thinking that the tickets are worth $200+ each, that those scalpers might not be able to sell them as easily as they thought.
Fortunately I have a lot of toys in my office so there isn't much need to go to sparkfun. Last time I was there I got some RGB LED's and some iPod dock connectors.
@W5VO It shouldn't be too hard to calculate. THere are on-line blood-alcohol calculators out there. Figure out how much beer you can drink in 4.5 hours without going over. That will be the upper limit on how much you can actually drink at GABF. My guess is that you can buy a lot more for $160, but you wouldn't get the variety.
@W5VO The last time I was there was 4+ years ago. It is much bigger now. Back then lines were not much of an issue. Even now I assume the problem will be staying sober enough to function.
4+ years ago I had to massively back off the drinking half way through. I started begging people to not give me the full 1 oz sample, and then I would usually just take a small sip and dump the rest. This time I will probably start doing that at the beginning-- and will likely still get blitzed.
@JGord Just nosy. Also, depending on what you do you might be able to get free samples from the various manufacturers (which lessens the dependence on Sparkfun). I'm not quite sure what a "device engineer" does.
@DavidKessner I'm entering college this year, but I've still managed to get my hands on a decent amount of "engineering samples", thanks to this list: ladyada.net/library/procure/samples.html :)
I've accumulated a lot of samples-- more than what I could ever use. Occasionally I clean out my office and lab and donate them to the local "maker-faire" type club.
Maxim and Microchip are particularly friendly to students, although it helps that I have a corporate looking domain name registered complete with email address
Comments on deleted posts don't reliably notify the owner of the deleted post about their existence, depending on the exact timing the post owner might never be informed about that comment. There is an explicit exception for comments from moderators made in a short timeframe before deleting the p...
@SimpleCoder I don't think this is "him". The new guy seems a bit clueless about how the site works, and his answers don't quite address the question that was asked, but he doesn't go quite so far off in the weeds, and don't go into crazy irrelevant detail about how things were done in the 1970's & 80s.
@W5VO $160 around here is like 10 6-packs of good-to-great beer; or like 30 750-mL bottles of good stuff; or 50 12-oz bottles from a local shop that sells micros by the bottle. That's more than I could drink in 10 full evenings of drinking (but maybe I'm getting old).
