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  1. S

    cas interface

    ?? ??? I know what ras and cas is( Row Address Select and Column Address Select) . Used in addressing memory. I also know what cam is(Computer Aided Manufacturing), but i dont know what magic cam, matrix cam, bdm or jtag is either. ??? Sorry. A description please. //Staigen
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    Rolls-Royce Show Engine Motor Controller

    Hey John, dont you think this is a little too simple, how to interface this to the hall sensor for example? And how much current do BTW10-400 stand. I did a little search for data on it, but i did not find any. //Staigen
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    Rolls-Royce Show Engine Motor Controller

    I dont think thats what Mr Morrison requested, but i also think we need moore input from Mr Morrison. What type of motor driving the engine for example. Some motors is not very suitable for variable rpm. Excuse me if i am wrong. //Staigen
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    cas interface

    What is a cas interface? //Staigen
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    cunonstant current load

    A constant current diode maybe, but i dont think they can go all the way down to 0 Volt. //Staigen
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    Convert 0-30V 3A PSU to 5A or more

    SOA = Safe Operating Area, its in the datasheet of the 2N3055. Its often overlooked in constructions of this type, the constructor only see the 117 Watts of dissipation possibilltys. //Staigen
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    Convert 0-30V 3A PSU to 5A or more

    Oops! I think i missed some of your reply. First the rectifier bridge, yes, and even higher rating, the difference here in sweden is minor between at 10 amp bridge and a 35 amp bridge ( 18:- Sek and 22:- Sek ) ! Schottky rectifier bridges i dont have any experience of, so there i can not give...
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    Convert 0-30V 3A PSU to 5A or more

    Have you thougt of the IC:s? They cant stand to much voltage! //Staigen
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    old car dashboard gauge repair instruction books

    Wich make and model? //Staigen
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    transistor replacements

    d975 = 2SD975 d965 = 2SD965 b174 = 2SB174 They often leave out the 2S when printing on japanese transistors //Staigen
  11. S

    Convert 0-30V 3A PSU to 5A or more

    There is a relation, but it is not that simple, you must also doubble the heatsink! If you put the 2 transistors on the same heatsink you cant double the current. Also, you cant just parallellconnect the 2 transistors, they are not going to share the current equally, you must also put a small...
  12. S

    Convert 0-30V 3A PSU to 5A or more

    Of course the transistors have to be connected in parallell. And i will suggest moore than 2 transistors. I dont think we can rise the transformer output to 30 Volts, the op-amps would not stand that voltage. //Staigen
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    Convert 0-30V 3A PSU to 5A or more

    I did understand you from the beginning, but i dont think the idea is so good, it complicate things, and it can make the PSU less reliable. The idea is not so dumb, it is much power dissipated at low output voltages and high currents, and that is transferred to heat, so if you can dissipate that...
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    Convert 0-30V 3A PSU to 5A or more

    Adding a heatsink? The heatsink is already there. Do you mean that we shall use the pass transistors without heatsink? I dont think that will work. Of course a bigger heatsink costs moore, but you only buy it once, but the PSU you use year out and year in, so if it cost i little moore in the...
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    Convert 0-30V 3A PSU to 5A or more

    Hi there Bogdan, shure they do! :) But we come to that later. Of course the pass transistor must have headroom, and i am also going to suggest multiple pass tansistors. Also fan cooling for the heatsink, in order to use a cheaper one. But the relay and its control circuit can easily be moore...
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    Convert 0-30V 3A PSU to 5A or more

    Yes, the transformer is rated at about 72 VA, and you try to take out about 90-100 VA! Is there any place on the internet that describe rectifiers, somewhere? I have difficulties explaining exactly how a rectifier works, i know how it work, but explaining it in a few words is harder. And i mean...
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    Convert 0-30V 3A PSU to 5A or more

    Hi all, i belive we should take the most of the discussions about the PSU and its coversion to higher currents in this forum. Mixos and me has have a small discussion about how to do the tests in ICQ and via email, and he have performed some tests now. The tests did not fall out as good as the...
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    Site Downloaders

    Have you find out who did it? If so, hang him/her out here in this forum! So someone can take care of him/her! //Staigen
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    Convert 0-30V 3A PSU to 5A or more

    Hey Mixos, have you tested your PSU for low voltage/ high current yet? When you are testing, also check the voltage over the reservoir cap (C1). Also check the voltage over the resistor R7, and also the voltage over D7 and the output voltage from U1 (at point 5 ). Also the temperature on the...
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    Convert 0-30V 3A PSU to 5A or more

    Just use the 30-35 Volts from the rectifier, a fan dont load much. Why not use 2 fans in series to cool both sides of the heatsink. But then you must do somthing to hold the middle point between the fans at a proper voltage. Can be done with a op-amp, i belive. But costs goes up! //Staigen
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