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  1. J

    basic electronincs

    would you sell me your copy? You seem well enough advanced to not kill yourself, I would gladly take it off your hands. :)
  2. J

    What is with these kids today?

    I will tell you another thing that bothers me to. Having to ask someone to explain their first post. Utter bullshit. I think it should be a strict policy to delete such rubbish. Though that will never happen, as I can understand why. But you talk about irritating...
  3. J

    Need help building a proportional circuit for my RC Tank

    Well it goes against everything I was ever taught to overdrive a component out of spec, it will surely have a negative effect on the life of the fan. But, if it was me, I would find a way to sense the voltage and then have a uC or w/e to drive the fan with PWM based upon the sensed voltage to...
  4. J

    Need help building a proportional circuit for my RC Tank

    So then you want to run the fan past it's max rating? Why is it so important to run the fan @7.2V?
  5. J

    555 touch switch

    out of curiosity, if you removed the touch plate and replaced it with a momentary push button(or anything that will hold the button low, then high to be triggered). Does the circuit work as expected? is it possible that you are shorting out the metal touch plate causing pin 2 to remain high...
  6. J

    Digital electronics

    I will throw my two cents in. I agree with Laplace.
  7. J

    What is with these kids today?

    Yep, I see it happen a lot and when it does happen I look the other way. I know I am not always that helpful, but it is irritating when someone demands answers. Some people just don't get it.
  8. J

    Polarity tester for 9 core cable

    what is a 9 core cable?
  9. J

    RC Rocket Pod

    You aren't gonna get anywhere near 2.5A from a 9V battery.
  10. J

    Basic RF relay switch help wanted

    commercially? That is the case, but if you are looking to produce a commercial product then you need to think like a business and pay for your R&D. There isn't one person out there that is gonna let you take their design and commercially profit from it without some return.
  11. J

    Hybrid 36v bicycle

    you will have 12V with the capacity of 3 batteries.
  12. J

    I have questions, I want you check my answers

    I don't think convert is the word you are looking for. Control would be more appropriate. what happen to q4?
  13. J

    Basic RF relay switch help wanted

    Not to mention pcb size will ultimately be the size required to fit all the parts. Again you can buy small surface mount parts, but soldering them onto a tiny pcb is not gonna be fun. I think you will find out that this is an oxymoron. In mass production it may make some sense, but for a one...
  14. J

    How to repair this

    I recently moved into an old house with knob and tube wiring. This type of connection was all over the place in the house. I have since unplugged this old wiring as I am scared to death of it. But, with that said those connections even after 40+ years where still in very good shape. I was amazed...
  15. J

    Pulse width modulation

    Power and heat are very closely related. Doesn't seem to me that you can maintain the same power level and reduce heat. A watt is a watt.
  16. J

    Eagle Footprint

    are you looking for the correct footprint? I can't see how eagle is missing the dip-40 footprint. I think you are looking at it all wrong. The datasheet will have all the measurements if you need to create your own footprints. I found KiCad very easy to use. Just to give you something to ponder...
  17. J

    voltage amplifier circuit using arduino mega 2560 for powering 20 leds

    sorry for getting off track, but is it safe to say that most logic level mosfets don't require a mosfet driver?
  18. J

    Basic RF relay switch help wanted

    You are asking for a very specific design. Unlikely you will find what you want. Even if you find a schematic, you will need to design a pcb layout and choose your parts etc. It can get very complicated for someone completely new to the idea. Hope you are up for a challenge. You will also need a...
  19. J

    Anyone maintaing the Links page?

    This is as good as place as any to be asking. Ian, the admin, never seems to miss much in this forum.
  20. J

    My absence

    anti-biotics? That surely would indicate a bacterial infection which is very common type of pneumonia. I think over +90% of pneumonia cases are bacterial. The other two types can be very deadly. Glad it turned out well for you. Don't forget to finish those meds, top priority now. Don't need a...
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