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  1. J

    DIY PCB

    Others might chastise me for saying this. But I don't think EAGLE offers the right environment for beginners. I know I never got anywhere with it when I first started. To much stuff that a beginner needs not know. As for your question, best to check on veecad if you want to know. I am sure...
  2. J

    Boost converter

    Ok, so I went over the datasheet for the mc34063. They have a schematic in there for an external NPN transistor. I assume I can just use this design and replace it with a MOSFET. I went through the formula table and figured out all my values. This is what I got, did I manage to do it right...
  3. J

    searches

    The timeout is set to stop people and mostly kids with toys from causing the server to overload itself and stop working so the people who actually care about this site can use it. Your not helping anyone if you need to use the search button twice in less then thirty seconds. Read some threads...
  4. J

    Boost converter

    I think I get it now. You are saying to add in a MOSFET, the gate to the switch collector of the output transistor of the 34063 and then the source to ground and the drain to the inductor where the switch collector was previously attached? I will whip a schematic up sometime and see if I am on...
  5. J

    Boost converter

    1.5A output is not nearly enough output current. I need at the very min 6A
  6. J

    Boost converter

    Is it impossible to think that I could use a 12V 50A max car battery charger transformer and make a 45V boost converter to run some steppers with a current draw of 2A per motor. total of 6A. I want something simple and I already have this transformer, so even though it is not that efficient of...
  7. J

    PCB & Pricing

    dorkbotpdx You pay $5 for 3 copies of your board per square inch. IE. $45 dollars for (3) 3" x 3" board.
  8. J

    IC 555

    The internal circuitry of the 555 sets this. You will need to understand how a 555 works if you really want to know. There is a flip-flop inside the 555 and when triggered it just switches states. http://www.unitechelectronics.com/NE-555.htm#NE555-trigger Yes, <1/3 (less then 1/3) of the input...
  9. J

    150 vdc regulated power supply 1-2 amps

    Linear? What is your input voltage?
  10. J

    IC 555

    http://en.wikipedia.org/wiki/555_timer_IC#Bistable the wiki does a great job of explaining it. Better then me. :)
  11. J

    IC 555

    active low - means in this instance that it requires a low signal for that pin to effect the output. A low signal on Pin 2 turns the output 'HIGH' and low signal on Pin 4 changes the output to a 'LOW' signal. It is explaining to you how to make the output of the 555 change states.
  12. J

    DIY PCB

    I don't think ink will stick to an overhead transparency.
  13. J

    IC 555

    Monostable: Correct, but you need to add that the LED will come back on after a certain amount of time. It will only change state when triggered, but it will remain in that new triggered state for only a time period set by you, the designer. Then it will go back to the original state. Ready for...
  14. J

    Need help understanding importance of Inductance

    Steve that was awesome, but I see a mistake. I don't believe you meant to say capacitor.
  15. J

    capacitors as batteries

    If anything, it will get complicated. ;)
  16. J

    I have issues with MAKE: Electronics experiment 8? (The link may not work so tell me

    Here in the tutorials section, on this site is a good article on how meters work. https://www.electronicspoint.com/dc-metering-circuits-f114.html You might be interested in the Ohmmeter section. :)
  17. J

    I have issues with MAKE: Electronics experiment 8? (The link may not work so tell me

    when steve says disconnect the leads, he means hold them up in the air separated. This is the only way to make sure that you have no connection between both leads. Your meter should give you a very large Ohm reading. Most new electronic multi-meters will read OL. This just means the resistance...
  18. J

    For Sale: Free 24 Very Large High Voltage Capacitors

    16935, shipping charges?
  19. J

    I have issues with MAKE: Electronics experiment 8? (The link may not work so tell me

    What is the relay voltage on the coil? If it is 12V, then you are way under powering the relay and yes that is the mistake you made. A 12V relay needs at the min 9V to work, I have used a 12V relay with a 9V battery before. Would be better to use 12V though.
  20. J

    I have issues with MAKE: Electronics experiment 8? (The link may not work so tell me

    Well you ain't going to get anywhere unless you answer the questions you been asked 3 times. We are trying to help, mostly steve, but you are making it extremely hard for everyone.
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