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Everything posted by faizanbrohi

  1. You Said this earlier for the 3A PSU and by the way how is the heatsink for the 3A PSU.
  2. As the Site says '' A good starting point is using 4 turns for each primary (that is, 4 turns, centre tap and another 4 turns IN THE SAME DIRECTION). To calculate the number of turns of the secondary winding, multiply by the turns ratio. For example, if you want to build a +/-30V supply, the turns ratio is 30/13.8=2.2 approx, so wind 2.2 x 4 = 8.8 turns (better 9 turns, to overcome the diode losses) for each secondary (that is, again, 9 turns, centre tap and another 9 turns IN THE SAME DIRECTION). '' And ''Another possibility is using a toroid. You can extract it from a BIG power inductor. As a guide, a 4cm diameter toroid with a section of about 1cm2 can be used for a > 250W SMPS. Winding is a little bit more complicated than with ETD cores but with a little practice is not too difficult either.'' Now THe Idea is we can use it to make a >250W power supply using 4cm toriod and some wires. For my Output i would require 55/13.8 = 3.98 which is 4 turns and 4 x 4 = 16 turns . the problem is do i require a biggger toriod than the 4cm one ? If yes how big.
  3. Actually it seems like i have to make a toriodal transformer which it says about 4cm Dia , Isn't there any simpler schematic please for god sake..
  4. I think you are mistaken , i am talking about the Inverter That you send .. ;D
  5. THe TIP 31A is a change , the Two Paralleled 2N3055 is a change and the UA741 right.. I am making the 3A one , which value of capacitor do i use. The Picture of my another heatsink is as follows.with and without fan
  6. I can use MJ15024 in this configration , they are 250W power transistors , to increase power , beacuse MTP75N06 is not manufactured as well as MTP60N06 THis only Leave BUZ11 and IRF540 , which can be found . but if i use MJ15024 in parallel combination with a good heatsink will it work Can You tell be a more simpler method , how i can order a transformer with input ratings and output ratings . so it is easy. (ie input voltage , centre tapped , output input current)
  7. There is one problem , the output is only 35 and -35V , i neeed 55 and -55V
  8. But the amplfiers that are in the market , especially Car Audio Amplfiers , are rated 1000W maximum value and 500W x 2 channel RMS IF i use one 250W for the Deck and the other one for the Car . i Will have to use a square wave inverter to produce 300W from a 12V car battery. and a square wave is easily converted to DC .
  9. I think just using a simple LC Circuit at the output will be goood . but the problem will come as the RC circuit produces a sawtooth if a square wave is input . i don't know what happens to a LC Circuit , it would produce a sine wave , but will not be linear
  10. BY the way i will try to buy another bigger heatsink , which has four TO-3 Transistors output it is about half the size of the M250 audio Amplfier (250W). It cost's around Rs 100 to 110 . i will take that. But You were saying , that we can use two Output Transistors paralleled ,( i am talking about one Unit) . can you show me how ???
  11. IT is to make Power Amplifier System with a CD Player and temprature display , 10 band VU meter and things like that.ok
  12. Will a Ferrroresonant Transformer Produce a Sinewave from the Square wave input and one more thing , as shown in figure is it possible to use a simple transformer and then add a capictor at one end with some rating
  13. No i am actually making two complete units with common input right , amd i am using 4 ohms speakers .
  14. But if i use the 2.2W x 12V fan , the Cooling will increase very well and will increase the thermal resistance
  15. Audio Guru , i also have the pic for the heatsink i am planning to use with this powersupply , and i was able to find the power transisitor TIP31A . THis heatsink is as closest i can find on farnell . which has thermal resisitance of 3.3 degrees C/W is this suitable. There is also a picture of the transformer
  16. Well Here is another Amplfier i found of 1.5 KW how is this Baby . this can drive upto 1.5KW , this is insanity , but wait just calculate how many batteries :o Godd Help me . No way , i neeed something like a ferroresonant transformer and a square wave inverter that's allll ;D Further More this is the fans Pic , i am just asking do i include two fans on one heatsink or not ???. I am Eager to use one fan per heatsink . THe Fans are rated 12V @2.2W and 200mA approx . and no i am not using these heatsinks for the inverter , i am using them first for the M250 Amplfier , Stereo 500W x 2 , 250 Watt per channel .
  17. It is getting all in all expensive to build a sine wave inverter. Well Good news i will send some pictures of the heatsink i bought for the M250.
  18. IF there are common connections . what will happen parallel voltage is same only current divides , and we have a lot of current no problemooo one car battery is about 55A @ 12V , the one which i have Here is an idea , what do you think
  19. so if different channels are used can it produce more power
  20. Well Thank God I got the Transistors at a low price , farnell is toooo expensive , i have bargained for Rs 1000 for 8 transistors , one transistors cost Rs 125 which is 1.25 pounds and 0.73 dollars i guess. so really low price. Well BEsides That i also have a 8 transisitor heatsink for only Rs 175 , which is 1.75 punds or 1 dollar approx. So I want to ask if this M250 can be used as a amplfier in the 500W inverter to increase power. and then use a power transformer afterwords..
  21. i Have looked it up in farnell , i found the transistors by searching and selecting my country . My distributer is makkays , so i will be looking to contact makkays . However i glitch that makkays have these transistors on hand. if not they have to import . But still they cost around 5.5 pounds . which is approximatiley Rs 550 and it is really very expensice for a transisitor.
  22. I Found something else also , the part number in the schematic i posted is MJE15024 and MJE 15025 which is wrong , it should be MJ15024 and MJ15025 , however MJE15030 and MJE15031 are correct numbers
  23. There is a big problem , i asked my friend today and he says , MJE15024 and MJE15025 is not available here :-[ , can you please suggest a replacement
  24. i have studyed just now that Class AB is about 79% efficient and Class A transformer coupled have 50% efficiency. However as far as the transformer is concerned , i have decided , a transformer of 2 x 38VAC @ 6A , with 2 x 12VDC @ 1 A for something(the other winding is seperate for from the first BUT IN THE SAME HOUSING) other then powering up a amplfier . i mean for the Detector circuits and the 10 band VU LED meter that i will insert in it . i will also need a bridge of 35A @ 230V , well i will begin in it later , seems like a tough project and a little expensive too . i will keep it as a mega audio project and now i will make the First Audio AMplfier i posted with PCB . i am going to draw a schematic and post it sooon. Wish me good luck in the exams , tommorow is my Solid state Devices and Basic Electrical Engineering paperz.
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