Jump to content
Electronics-Lab.com Community


  • Posts

  • Joined

  • Last visited


scuba14c's Achievements


Newbie (1/14)



  1. Sorry, here is the link- http://www.allelectronics.com/cgi-bin/category.cgi?category=160400&item=GC-125&type=store
  2. I want to buy rechargeable batteries and found these- http://www.allelectronics.com/cgi-bin/category.cgi?-125&type=store I think this charger will work, but I wanted to get some input before I buy them. charger- http://cgi.ebay.com/ebaymotors/12-Volt-Battery-Tric Is there anything I should know about these types of batteries?
  3. Yes, the one I meant was connected to pin 2. I bought a breadboard and used this for as many parts as possible.
  4. I tried it but it didn't work. Was the ground from the timer supposed to go to the back of the transistor? I have a circuit layout from someone else who built a boost converter, but am unsure of one of the components he used. The diagram for the boost converter does not show it. Could you identify the device on the upperleft hand side of the board?
  5. Is there a way to change the 100k resistors to lower values? The most I have are 20k power resistors. I am connecting the 555 timer output (+) to the back of the transistor and the (-) to the left pin. The center pin is connected to the output side of the inductor. The right pin is connected to the negative terminal of the capacitor. To start it I give it a pulse with the timer and then touch the negative side of the battery to the right pin of the transistor. This will get me to ~28V in less than a second, but it takes 10 seconds longer for it to reach the 32V maximum. Is this the way it should be connected?
  6. Part of the problem I am having is not being sure if I am connecting things to the switches the right way. I will try the circuit you provided and see if it works.
  7. I've been using 3 different kinds: 400V 8A NPN transistor TO-220 case http://www.alliedelec.com/cart/ProductDetail.asp?SKU=568-4088&SEARCH=MJE13007&ID=&DESC=MJE13007 ***This one is the only one that will get to 30V, the other two reach 20-25V*** 500V 14A Field Effect N channel power transistor TO-247AC case http://www.alliedelec.com/cart/ProductDetail.asp?SKU=273-9997&SEARCH=IRFP450&ID=&DESC=IRFP450 1200V 20A IGBT TO-247 case http://www.alliedelec.com/cart/ProductDetail.asp?SKU=273-7740&SEARCH=IRG4PH50K&ID=&DESC=IRG4PH50K ***The last two have to have the 555 timer going to charge and make a whining sound. For the first I touch it the back and right pin of the transistor once and it will go to 30V. If I try operating the 555 timer while it's charging, it stops.
  8. I need to see if I am connecting the leads to the right pins. For some reason it will only oscillate to 30V.
  9. Just realized what you were asking. I meant the pins on the IGBT or transistor.
  10. The pin numbers aren't the problem, I can build the 555, but the switch I'm using won't oscillate. It only boosts until 30V, with either the boost converter or transformer. I'm not sure if the equipment I'm using is wrong or if I don't know how to operate the circuit.
  11. I have it soldered together with wires, but I can't get the switch to oscillate. I have tried it on the boost converter, the converter using the transformer and a flyback driver. Could you give me a diagram showing me how to connect the boost converter driving circuit (what wire goes to which pin, how I start operating it). How do I start the switch oscillating?
  12. I don't think I've figured out how to build and/or use the driver yet. Will someone explain how to assemble it and operate it?
  13. the battery wasn't connected when I measured it. The charger is only giving me a 2-3 V charge when I use just the transformer. Any ideas??
  14. I think that the wall converter should work, but I have one question. The side that was origionally plugged into the wall and is now my secondary doesn't register with the continuity test on my DMM, but it does conduct when I connect a battery. When the DMM is connected it registers .5 on the screen. Do you know what the number means?
  • Create New...