ante

Hi, You can try http://www.cmbcomponents.com/ Ante ::)

Hi mastrila, Do you have the variac directly between mains and your PSU circuit? If so is the variac you are using a full transformer model? Ante ::)

A great place for manuals and bulletins covering lots of different equipment: http://www.wimtv.be/techniforum/ Ante ::)

Hi mastrila, If C7 gets hot you probably got oscillation. The only way C7 can get hot is if it

Must be some [glow=red,2,300]BIG[/glow] crystals if they are used to charge batterys. Ante ::)

Hi gaark. I have seen a PSU that was equipped with a triac regulation on transformer primary. The way they done it was using a dual potentiometer for the voltage control, not a closed loop. The set-up was about 8 volts difference with no load. I think if you want a closed loop control you have to use a digital potentiometer with

I believe the filtered output is a necessity because the way switchers work. They shop the current at 40 to 100 kHz (sometimes more) and create spikes and some interference that must be restrained. Ante ::)

Ok, I have missed it then, what is the chip id please? Ante ::)

Go to http://www.doom.com/results_sample.asp and type in SPCA711A. Ante ::)

Hi. bogdan. The energy in this is very low; I don

If you only have 2 volts, what

Hi. Try this one, hope it's the right one! http://www.searchdatasheets.com/search.asp?q=29W320&t= Ante ::)

Good Job! Thanks! Ante ::)

Hi Hope this will help you. http://www.casio.co.jp/ced/english/pdf/E_PDF/model/T1151.pdf. Ante ::)

Hi MP. Isn

Hi. I think C2 and C3:s connections should be as short as possible and be located closer to the regulator. Ante ::)

Sorry. All white led:s I have seen so far are 3.6V drop so 5 Volts will to fine. Unless it was 2.5 V stated in the question instead of 2 - 5 Volts, as I believed. Ante ::)

Why use a chip for this, just a couple of resistors will do the job. Ante ::)

Hi! A voltage doubler will give you higher voltage but not much usable current! I think it

MP, OK, there are some things I still not agree on. One example: how can a 10Amp load suddenly pull 100Amps through one transistor even if the transistor should be shorted?? I must have a lot to learn about this. But because this is not the right forum for this I rest my case. I am also interested in the outcome of this inverter but I will not question the construction again. By the way, the link did not contain any info on switching transistors. Thanks. Ante ::)

OK, suppose we have four transistors in parallel and we like to switch say10 Amp@12 Volts. The transistors are not exactly the same (not from the same batch) but we want to use them anyway. The first has 0.2 V drop the second 0.3 the third 0.25 and the last 0.25. This does not mean that all the current runs through the first one whit the lowest resistance sins they are all in parallel. If we add resistors to each one of the transistors we also add further drop (0R1 X 2.5A = 0.25V) if the transistors had been equal. Can you explain the reason for the resistors by adding info on the following drawings, please? Sorry for being a pain in your neck, but I think debating things like this is very stimulating. Just stop me when I become too much! ;D The (Swedish) mule! Ante ::)

Hi MP & hotwaterwizard ! I, we checked the link and it was nice reading, lots of good thinking and valuable info. But this project is a linear one and stubborn as I am :)I still state that switch mode is very different from linear. You don

Hi MP. I agree to that, but even if one resistor (transistor) is smaller they are all in parallel. I don

Hi MP. I

Here is an attenator for pc oscilloscope that is used for soundcard input but it will probably be possible to apply in this case. The site is in Norwegian but the schematic is pretty simple. http://home.online.no/%7Esondred/Gamle%20sider/attenuator.htm Ante ::)