MP Posted September 4, 2006 Report Share Posted September 4, 2006 It all depends upon the motors you are using. If you are using 5 volt motors, you can use 5 volt for all. I have 12 volt motors. This is why I used the 12 volt buss from the power supply for the motors. A PC power supply provides 5 volt and 12 volt. Red to Black is 5 volts and Yellow to Black is 12 volts. It also provides a negative 12 and negative 5 that you will not use.Here is an interesting website that discusses making a power supply from an old PC supply:http://web2.murraystate.edu/andy.batts/ps/POWERSUPPLY.HTMMP Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 4, 2006 Report Share Posted September 4, 2006 thanks MP you are super!!! ;)thanks thanks Quote Link to comment Share on other sites More sharing options...
MP Posted September 4, 2006 Report Share Posted September 4, 2006 No problem! 8)Hope you will share a picture of your finished product with the group when you are done.Good luck!MP Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 4, 2006 Report Share Posted September 4, 2006 i will start my proekt when i faind step motorsi'm searching for ....i wiil send pic i promise :)i hope u will be here if I'm stuck :-\thanks Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 5, 2006 Report Share Posted September 5, 2006 i have problemis tart to build board but i cant faind UCN5804Bcan i use difirent part for this board????tahnks tahanks Quote Link to comment Share on other sites More sharing options...
MP Posted September 7, 2006 Report Share Posted September 7, 2006 try here:http://www.alltronics.com/cgi-bin/category.cgiMP Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 19, 2006 Report Share Posted September 19, 2006 hi i build the board and find step motors from 5,25'' floppy but they work on 12V and have 4 wires how a will connect whit board this motors and whit powercen you show me some pic for thisThanks Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 20, 2006 Report Share Posted September 20, 2006 i need help plaese :'( :'( :'( :'( Quote Link to comment Share on other sites More sharing options...
MP Posted September 21, 2006 Report Share Posted September 21, 2006 nikolaw,Here is a good site that can help you with this:http://www.doc.ic.ac.uk/~ih/doc/stepper/MP Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 21, 2006 Report Share Posted September 21, 2006 tahks MP but where i mast to connect +/-12v power for step motorhow? please help me? :'( :'( :'( :'( Quote Link to comment Share on other sites More sharing options...
MP Posted September 22, 2006 Report Share Posted September 22, 2006 You won't be able to supply 12 volts to the stepper in this configuration. Just connect to the board. In a configuration where you use 12 volts for the stepper, you usually use a different stepper. Aren't your steppers 5 volt ones? I thought this was the case. In a setup where you would use both the 5 volt and the 12 volt tap of the power supply, you would have your digital circuitry running from the 5 volt source and the motor circuit running from the 12 volt source.MP Quote Link to comment Share on other sites More sharing options...
GreekPIC Posted September 22, 2006 Report Share Posted September 22, 2006 You won't be able to supply 12 volts to the stepper in this configuration. Just connect to the board. In a configuration where you use 12 volts for the stepper, you usually use a different stepper. Aren't your steppers 5 volt ones? I thought this was the case. In a setup where you would use both the 5 volt and the 12 volt tap of the power supply, you would have your digital circuitry running from the 5 volt source and the motor circuit running from the 12 volt source.MPMP, his main problem is that he has a bipolar motor while the board only supports unipolar ones (5,6,8 wire motrors).There is a circuit that can be added to the board to drive bipolar motors (I have it around somewhere) but it needs 12 power transistors per motor. It's much better to just look for another motor.Nikolas Quote Link to comment Share on other sites More sharing options...
MP Posted September 23, 2006 Report Share Posted September 23, 2006 Hi Nikolas,From the drawing it looks like he has a board. Not sure. Did you know that you can change bipolar to unipolar on the 8 wire motors easily? You just connect the two center wires. I have attached a basic drawing in case anyone is interested.MP Quote Link to comment Share on other sites More sharing options...
MP Posted September 23, 2006 Report Share Posted September 23, 2006 Here is a schematic that will allow you to use 4 wire bipolar or 6 wire unipolar in the same circuit. It is also an example of using 5 volts for the digital circuitry and a larger voltage for the stepper motor as I described above.MPBi-Polar_Stepper_Driver_ck1406.pdf Quote Link to comment Share on other sites More sharing options...
MP Posted September 23, 2006 Report Share Posted September 23, 2006 Here is also a PIC to Unipolar design that uses darlingtons. Of course, if you are running your circuit from the parallel port of a PC, you can connect the parallel port at points RA0, RA1, etc and not use a PIC.Hope these are helpful to someone. The URL for the original site is at the bottom of the page on this pdf, so you can go there to get more information.MPPIC_to_Unipolar_Steppers.pdf Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 24, 2006 Report Share Posted September 24, 2006 himy problem is thisi build board on this proekt whit UCN5804Bthis board use +5v power suplybut i have some step motors whit 5 wires who works on 12 Vhow can i conect this motors whit this board whet they need 12 V to workthis motors are from 5,25 floppy (the old one)a what to build CNC who will work whit KCam 4 CNC Controllercan you help me pleas pleas Quote Link to comment Share on other sites More sharing options...
MP Posted September 25, 2006 Report Share Posted September 25, 2006 Is this using the schematic in our projects section or a different design? Please provide a link or post the schematic if it is not the one in our project section. We just need to know for sure which layout you are using.A 5 wire stepper is usually the same as a 6 wire stepper with only one wire provided to supply the voltage to the center tap of both sets of windings instead of individual wires provided to the center tap of the windings as in a 6 wire stepper.MP Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 25, 2006 Report Share Posted September 25, 2006 Is this using the schematic in our projects section or a different design? Please provide a link or post the schematic if it is not the one in our project section. We just need to know for sure which layout you are using.A 5 wire stepper is usually the same as a 6 wire stepper with only one wire provided to supply the voltage to the center tap of both sets of windings instead of individual wires provided to the center tap of the windings as in a 6 wire stepper.MPI use this projects http://www.electronics-lab.com/projects/pc/008/but i have step motors who work with 12V how can i conect this steps whit the boardplease help me?can u give me mail or msn or skype my mail is [email protected] Quote Link to comment Share on other sites More sharing options...
MP Posted September 25, 2006 Report Share Posted September 25, 2006 You can apply a higher voltage at the motors, connected to pins 2 and 7. Look at the data sheet I have attached for an example.MPUCN5804B.pdf Quote Link to comment Share on other sites More sharing options...
GreekPIC Posted September 25, 2006 Report Share Posted September 25, 2006 this board use +5v power suplyIt doesn't. It has an on-board 5v power supply circuit with the 7805 regulator. It takes a 8-24v input.but i have some step motors whit 5 wires who works on 12 VYou connect 12v to the board. It goes straight to the motors. It also goes through the 7805 to provide 5v for the chips.Nikolas Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 26, 2006 Report Share Posted September 26, 2006 It doesn't. It has an on-board 5v power supply circuit with the 7805 regulator. It takes a 8-24v input.You connect 12v to the board. It goes straight to the motors. It also goes through the 7805 to provide 5v for the chips.Nikolashiif i understand you i just need to connect 12V on place were i connect 5V??????? Quote Link to comment Share on other sites More sharing options...
GreekPIC Posted September 26, 2006 Report Share Posted September 26, 2006 [were i connect 5V???????Nowhere. It's created on the board. Look at the PCB. It's my revised version but the basics are the same:The 12v is connected to the two large pads on the right. The three pads next to them to the left are for the 7805. The lowest (square) is 12v input, the middle is GND and the topmost is the 5v output, which feeds the ICsThe large trace going up and then left, carries the 12v to the motors.Nikolas Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 27, 2006 Report Share Posted September 27, 2006 if i understand i mast to do this??????? Quote Link to comment Share on other sites More sharing options...
GreekPIC Posted September 27, 2006 Report Share Posted September 27, 2006 You got it! Quote Link to comment Share on other sites More sharing options...
nikolaw Posted September 28, 2006 Report Share Posted September 28, 2006 You got it!thanks man you are super!!! ;) ;) ;) ;) ;) ;) ;) ;) Quote Link to comment Share on other sites More sharing options...
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