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scuba14c

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  2. batteries

    in Electronic Projects Design/Ideas

    Posted

    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?

  5. boost converter

    in High Voltage Stuff

    Posted

    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?

    post-8662-14279142274218_thumb.gif

  6. boost converter

    in High Voltage Stuff

    Posted

      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?

  8. boost converter

    in High Voltage Stuff

    Posted

    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.

         

  11. boost converter

    in High Voltage Stuff

    Posted

    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.

  12. boost converter

    in High Voltage Stuff

    Posted

    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?

  15. boost converter

    in High Voltage Stuff

    Posted

    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?

  19. boost converter

    in High Voltage Stuff

    Posted

    I want to run this by you before I wind this. I have a bobbin shaped piece pf plastic with a hole in the middle. Can I wind around this and separate it in the middle, and then use a steel rod through the middle? Right now these are the only materials I can get.

  23. boost converter

    in High Voltage Stuff

    Posted

    I set it up without using a switch, and two 6V lantern batteries and it gave me about 25V off of a salvaged transformer. I'm not sure what the winding ratio is, but plan to make my own. The only problem I noticed was that it would lose voltage very quickly. The capacitor that I was using was a photoflash, 330V. I'm not sure if this was because the capacitor was low quality, but I did have an ultrafast diode connected to it. Can a transformer be wound on any type of ferrite core? Is there any way to electronically activate the batteries so I don't have to manually switch the power?

  24. boost converter

    in High Voltage Stuff

    Posted

    You lost me on the last post. Is the schematic you posted all I need to assemble to charge? If so I can get this done after school tomorrow and report back. Would it work if I just touched the battery to the transformer once a second, or do I need an electronically controlled switch to do this?

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