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Everything posted by Xenobius

  1. Cool thanks a lot I had 2 problems. The gnd was not earthed as you said but also the power supply that I was using had just one diode to make ac into dc and thats was another problem. Thanks
  2. Hello all, I have built this circuit http://www.electronics-lab.com/projects/sensors/008/ and it worked. However I have a problem. I am using a DC adaptor to give it 12v and so im not so sure if its pure dc. The problem is that, IF I touch the positive metal part of the power supply, the circuit works perfectly... if I remove my finger from the positive of the power supply, the RED led (of the circuit LED1) turns ON until I touch the + again. Could this be a filtering problem of the power supply? I put 10uF and 68nF in parallel across the power supply but no luck. Thanks all
  3. THANKS guys for your support I will check the links from home and let you know. Keep the discussion up. thanks
  4. Ah no good for me because its only upto 200v and its for 400Hz :(
  5. Well I am using either single phase current which is 230VAC at 50Hz or 3 phase supply which is 400VAC between phases at same frequency.
  6. Yes I agree about the heat in the dummy load. Well at least its only Heat and not BANG .. there goes the bulb ... hehe Im still terribly interested in knowing more. For example about the DIY resistors .. using some special wire you said.. Any more information please? thanks guys please keep it up 8)
  7. hmm :o thanks mate. Do you think you can explain this a little better as I coudn't imagine how to doit. Thankyou !!
  8. Cool did you buy it or did you make it? Do you have any pictures or anything? thanks :D :D
  9. Nice to see you are interested. Well I am working with 230vac at 50hz. I have some solidstate relays which I need to load to test them. I know its expensive but I still would like to give it a shot here Thanks guys!! Looking forward to your help as I am lost hehe :D Will post some pictures of it when I finish it (if I start it) hehe :P
  10. Hi guys, I am looking for a circuit so that I can build a variable dummy load AC not DC. Could anyone help out? I am currently using rows and rows of 200W bulbs .. but they heat up too much. Any other IDEA apart from Resistors which are really really expensive? thankyou PS. I did find a DC dummy load here in the forums but as said.. its DC not AC THANKS
  11. Hmm No no I need to use the motherboard IDE Sockes! :p all PCI Slots are booked :-X I was reading in that article that if you remove the power of a hdd, the bios will still detect it. Could anyone tell me which pins does the bios use to dedect this? thanks guys
  12. Dear friends, I have a problem right now. I have 2 hardisks in my pc and 3 optical drives. Since I use all of them, I have to turn off the computer, unplug a cd-rom and plug in my dvdrom and turn on the computer again. Is it possible to make a switch not on the power but on the IDE cable so that the computer will literally think the drive is not connected? altghou i will still leave it connected? For example I was thinking.... I will cut only the data wires of the ribbon cable and make a switch to connect/disconnect them. It this possible? .... I know there are 4 - 6 wires which the computer uses to verify if the cd-rom is connected and if i cut those, It will help a lot thanks A LOT
  13. THANKS dude! Will give them a look and let you know ;) sorry took me some time to reply.. vb project giving me a head ache :P
  14. Could you kindly send me a link to a schematic that will do the job for the motor please? thanks dude!
  15. Thanks for the reply buddy. It should run only in one direction. and it i a DC Motor. Power is already supplied (2 large batteries) also when I connect them, it gives a hell of a kick start. thanks a lot
  16. Hello, I would like to build my own Laptop Psu because the original one broke. Could somone kindly enough point me to a Circuit of a Fixed PSU which gives me 19v @ 5A ?? ALSO since a PWM Power Supply does not heat up that much, is it good for a Laptop?? thanks a lot PS.. Speaking of PWM.. I have a motor which takes 24v @ 14A. Does anyone have a circuit to controll such a motor?? the supply of this motor is two large batteries with 12v each in series. Thanks a lot. Xenobius
  17. Umm .. think I didn't explain myself. The coil is like this picture PS. The picture above is just a spiral thing I found just to show you what I want. As you can see, it is more difficult to wind it, because it moves a lot ! :( thanks
  18. Ok this is stupid ... But i must ask.. Could somone help me by giving me IDEAs on how to make the coil ROUND flat on the table not as we usually see it wound on a rod. I am trying al sort of stuff but the coil just doesn't come roundish ... any ideas on how to make it perfectly round with perfect spaces in between? maybe a smal mechanical machine ? thanks
  19. OH I love you guys !! Really I was going to wast a lot of money !! THANKS A LOT Will try it with normal wire. PS.. My coil is not going to touch because it is going to be like a spiral with 10mm away from each turn !! WIPPY .. Cheers
  20. I would like to build a circuit which has a coil and it stated that it should be "FLAT MAGNET WIRE" . Ok I understand FLAT .. (any wire I choose must be bought Flat and not round and infact I found on the internet which is Flat) but I was searching a reliable shop and it stated that Magnet wire is a term used to show that the wire is going to be used in Winding transformers ..... As far as I know Transformers are wound with normal copper wire with insulated yellow stuff (forgot its name) Anyways .. Could someone tell me what REALLY is Magnet wire? because I was thinking that the wire itself is made of magnet material and if you put a small piece of magnet wire near an iron, it would be attracted just like a magnet would do with a piece of iron... but all of a sudden I am thinking it is just a normal wire with insulation. Thanks for the help Cheers
  21. I do not know how to shut of the engine with the help of a switch but about the cellphone, My friend has just built a unit which switched on and off when you call. You will need a cellphone with a NEW simcard. Remember you will not be able to use the cellphone again as you need to modify it and also you need a simcard which it totally new and which NO ONE knows aout because if somone calls you the relay would switch either on or off depending on the state it was. If you can afford the rent of the simcard and the cellphone, you may ask again. The circuit works as follows. when the cellphone receives a ring, it will give a signal to the microphone, only the microhpne is now connected to a circuit to switch either on or off. The circuit also ENDS your call automatically too. I do not have the circuit but it is easily done because I have seen it and it only needs a flipflop and a 555 timer and some components to aid them. cheers.
  22. Hello people, I would kindly like to ask somthing which is giving me a lot of trouble finding on the web. I am trying to make a small cupboard with strange methods of opening it!! I was thinking about making somthing from inside the wooden door at a random place only known by me, and when I put some sort of magnet from outside, the sensor from inside would sense the magnetism and give a logic 1 (5v). Than I would insert a smart card in a slot and if verified OK, would give me another logic 1 (5v). Than with the help of an AND-GATE, I would have 2 logic 1 and an input and the AND-GATE would give a logic 1 switching a transistor and the transistor switching a relay which would give supply on an electric lock and the door would open. The third problem is about the AND-GATE because as soon as I remove the magnets the logic would go to 0 (0v) and I would not have enough time to open the door. SUMMERY: I was thinking of making 2 of these magnetic sensors and 1 smart card reader. I would kindly like to ask somone to help me with the megnatic sensor, the smart card circuit to read a smart card and a person to write me a code so that the TIMING could be adjusted so that I would have 4 seconds chance to put all 3 sensors into logic 1. Otherwise it would reset and I have to start again. And give me 4 seconds chance to OPEN the door. Once the door is open, the pic would reset and the electronic lock would close, so that when I am finished from putting stuff inside the cupboard, I just close the door and everything would be closed and reset and would need me to input the 3 logics AGAIN if I need to open the door. THANKS EVERYONE for the help. I really appriciate and am looking forward to put up a PDF file of the WHOLE finished thing when it is done!! THANKS AGAIN
  23. thanks a lot everyone for helping me out.. But I still do not know which one I need to build from these in the list. just to remind you. I have 2 different telephone numbers 1234 and 5678 and I need to connect with the other one just like calling normally BUT without the charge. These 2 numbers are in the same house so I can talk to my mother from upstairs to downstaris.. In other words the telephone lines are both here infornt of me !! All I want is a thing to connect them together in a way that when I am busy on the line NO ONE can listen to the call and they cannot phone me... they only succeded to contact me when I am not using thep hone. so if I am on thep hone they would not interrupt me.. and vise versa.. thankyou !!
  24. Hello all . I have managed to make the problem solved by buying a small ready made switch which you push it and torun on the lights .. after 30 seconds its off! thansk everyone
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