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We have eight IF boards in our equipment. Most of the IF part run on +15V. The last demodulator (controlled by a shift register running at 40 MHz) runs on +5V, and the ADCs run on +/- 5V. The analog filter on the ADC inputs runs on +/- 15V. The principle in the power supply is shown in the...

-->> PNachtwey To be honest, I am going for the steady state approach (alpha-beta-gamma), maybe switching between a small number of them, but in the scientific world Kalman is the buzzword [peace]. The way I wrote that speed update statement (matrix-unlike, I hope [blush]) was intended on...

Another thing about those breadboards. You do not have any control of capacities! There can easily be 1 nF between two neighboring rows, and that can couple things where they are not supposed to go!

We need to slave our turntable to an external radar. We will also have to predict a little time forward in order to compensate for various delays. A Kalman-like approach seems a good solution. The radar delivers various data, including X, Y and Z position on the target, so standard Kalman can...

Have that book! Not sure which chapter deals with more than one observation parameter, though.

Well, yes. This is mainly into algorithms, but I have not found a specific forum for that. We have a scientific radar we want to slave to tracking radars during aircraft trials etc. These radars usually deliver range, bearing, elevation, track and ground speed referenced to some point, if not...

The card worked i my brothers camera, as he was able to view the videos in that. The card was shipped taped with Al tape to a piece of paper with description of the files. I have received other SD cards from him that way without any problem. I have tried three different SD card readers on two...

Not sure, if this is the correct forum, but here goes... I have received a SD card from my brother i Arizona. The drive appears to be completely defective upon arrival (does not show up at all), but working before it was mailed. According to this...

Due to some error, we have been shipped a 3-phase 380V, 350W fan. We, hopfully, ordered a 230V single phase version, but do not have time for a replacement. I know we can create a semi-phase by using a capacitor. The datasheet covering all the "250" different versions (incl. 48V DC) mentiones...

My brother has asked me a strange question. Apparently the distribution lines (100 kV or more) are Y-coupled. But the neutral current is said to be nearly zero (1-2A), virtually no matter how unballanced the load on the 3-phase consumer net is. (400V European Y with high N-current) Can anybody...

I am trying to simulate a crystal Colpit oscillator in the free B2-Spice edition. (release 4.2.1) I do have oscillation, but only a few mVpp, and only very near a perfect sine. (No harmonics it seems :-( The crystal is composed of 20fF, 1.25mH and 30 Ohm resistor in series. All shunted by...

Yes, I have started looking into PLL oscillators. Even before posting the above. They are all SMD, however :-( And they consume loads of power. (30 to 75 mA @ 3.3V) The later could be a problem, as the unit is battery powered. On the other hand I can get the frequency, I really need. in the...

I will be needing a 1st LO at around 48 MHz. That seems to be in the 3rd overtone area. But a strange question just popped up. Does every crystal have useful overtones or do they have to be specifically cut to have that? I mean, could I take any, say, 16 MHz crystal, use in a 3rd overtone...

I am not quite sure where to place this, but here goes. I have implemented a 'simple' Kalman filter for 1 dimentional (range) tracking. It works for slow targets, but I kind of wonder, if it is correct, that the range gain always end up at exactly the same value no matter what I set the two...

My dad is using an older DOS program for acounting. Until recently it worked fine under Win ME. On his new PC he is running XP prof. and the software as such works fine. The problem comes, when he wants to print something. At times it works fine and at other times the Windows spooler crashes...

The load, as I understand it, is more or less standard household appliances (fridge, freezer etc, but running on DC!) that needs to be turned on and off remotely.

Yes, I have also stumpled over that zero crossing. Yet another thing to keep an eye out for. On the other hand it might turn out, that the guy is using 24VDC, which of course makes it somewhat easier.

Someone just asked me, if it would be possible to use a solid-state relay to disconnect a 115-130 VDC line with an electrical motor as load ? As the motor will be inductive, I may have to add a fly-back diode with or without an additional resistor in series. But what else should I look out for...

My parents want to connect my mum's PC on the 2nd floor to the internet, which my dad uses in his office in the basement. (only socket is located there!) They live in a standard Danish brick house from 1932 with, to my knowledge, no concrete or metal grids between the floors. The cheapest...

In Denmark Live is usually Black or Brown depending on which phase it is. Neutral is Blue. Earth is twisted Yellow/Green. In older installations, however I have seen Black Neutrals, White Lives, and pure Yellow Earths as well. A bit confusing to say the least!