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Three phase imbalance detection
Kartman wrote:The trick will be to tune the value of C4 so that you get an amount of AC ripple when you get an inbalance. You could use something like a cmos 555 as a comparator...
Friday, 13 November 2015 - 15:52
Three phase imbalance detection
Kartman wrote:How many amps will be drawn by the 300 ohm resistors at 220V? You'll need big resistors. It pays to keep your simulations based on reality. If we picture the three...
Thursday, 12 November 2015 - 00:59
3-phase line phase imbalance detector
Hey Jim:   the phase error is to be detected at the source, in order to tell the operator that the phases are not aligned, but as i'm looking for solutions, a discrete one if...
Saturday, 22 August 2015 - 22:47
TACT switch for mains operation
Thanks for the answers   @Kartman : yes, there are 220VAC between contacts when the circuit isn't running. I've tested it and it worked, but probably ambient humidity is in...
Friday, 22 May 2015 - 13:01
lm331 cheap alternative as smd
Of corrs yes Ross! I don't know what are that chips, if they are NS original leftovers or not. I've bought some time ago some chips that were discontinued by their manufacturers,...
Thursday, 2 October 2014 - 18:50
lm331 cheap alternative as smd
hey Incal.   See this I think you can ask for bigger quantities.     cheers Nachus
Wednesday, 1 October 2014 - 13:58
DC to DC isolated issue
ovi2wise wrote: the isolation is important for us, the company I work for is in the business of building electrical vehicles, and so far for every vehicle, we have used voltage...
Friday, 11 July 2014 - 14:48
SOT23-6 package, Any experience for DIY reflow soldering
I usually solder this way: SOT23-X : flux the component PCB area, and the component itself with a brush, with the help of tweezers. Get a solder drop on the iron's tip. Position...
Monday, 10 February 2014 - 14:04
DC to DC converter suggestions
Define first what DC/DC topology are you going to follow and then look at the catalog of Power integrations cheers Nachus
Tuesday, 19 November 2013 - 15:52
Analog buttons
Kromey wrote:nachus, that's interesting... I assume the basic principle there is to be flipping the pin between read to check for a button press, and write to send data to the...
Friday, 15 November 2013 - 19:33
Analog buttons
Hey Kromey: You can use the bus where the display is attached, and use Diodes as switches, plus one extra pin. It's necessary to know what display are you using and how it's...
Thursday, 14 November 2013 - 18:36
Alkaline AAA batteries as memory backup??
sparrow2 wrote:official a alkaline's voltages drop fast, but that is with a "normal" load, with this low load it will be higher than the load graphs will show. But are you sure...
Thursday, 10 October 2013 - 15:27