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  1. J

    Solar panel questions

    I happen to be watching tv the other day and on the science channel "How is it made" they had solar panels. To quality control the process of the solar panels they would measure the power produced from the panel when it was tested using a HID light. They did not say what light they where using...
  2. J

    Schematic editor

    People always under estimate what a simple screen cap can do... Use any app you want and hit ctrl+print screen. Ctrl+p in ms paint and save as. Windows 7 has snipping tool, even better.
  3. J

    555 timer internal working

    Some suggest the 555 timer gets its name from the 3 - 5k Ohm resistors that make up the voltage dividing network that gives it 1/3 and 2/3 switching voltages of VCC. wiki differs in opinion, but I don't believe in coincidences very much. http://en.wikipedia.org/wiki/555_timer_IC
  4. J

    Solar panel questions

    There again, you do not need to buy that fixture for a HID to work. I bought my HPS ballast used $150 (400 watt) and bought $20 bulbs for it at home depot. Look around online. The only part of a HID that you need new is the bulb so you receive the max lumen's possible. Any bulb even a CFL will...
  5. J

    On/Off Delay Timer

    Use a binary counter chip with an internal oscillator. Say a CD4060 or a CD4541 Probably should read this thread, it's worth the read and takes a few mins at most https://www.electronicspoint.com/timers-notes-less-experienced-work-progress-t220141.html
  6. J

    Solar panel questions

    I don't know how photovoltaic cells work exactly, but if radiant power is a factor then you would be better to look toward HID lights. Even then I think a 250 watt HID will provide as much lumen's as those particularly expensive CFL's. You don't need those expensive ballast they use in...
  7. J

    Circuit clarification needed.

    Yep I get this concept. I had assumed the exact same operation. Mark - space ratio is equivalent to the duty cycle of the square wave? I am trying to understand this and if I get what you are saying, then to me when the square wave with a 50% duty cycle enters the H-bridge, the current flow...
  8. J

    Circuit clarification needed.

    Can someone please help explain to me how this circuit works? I am pretty sure I understand how the voltage divider network works. I am pretty sure I understand how the H-bridge works. What I do not seem to grasp is how they use PWM in this schematic to turn the motor at slower speeds in both...
  9. J

    CIRCUIT SIMULATOR

    I tried a few before I finally decided to stick with multisim. Really depends on your needs though. Not all simulators are created in equal ways for various reasons.
  10. J

    HELP - DIY AC conversion to steady flow DC

    Well from my understanding an inductor resist changes in current by releasing it's stored energy back into the system in the form of voltage to try and keep current flowing. From what I read the other day from resquline, inductors only work at high frequency. So I don't think that is what you...
  11. J

    Need a little help with a timer please

    If you have a mechanical mind then, programming a picaxe with some flowcharts should be like a walk in the park for you. look up flowchart programming picaxe on google.
  12. J

    direct current stimulation

    Inductors resist changes in current. I am sure there is also current regulating IC's just like voltage regulators.
  13. J

    Ideas and Feedback

    I got some more feedback, how about a specific section for people who want to advertise or maybe even a spot where people can pay to advertise on this site. Lately it seems there has been a lot of this going on in the general forums.
  14. J

    Great explanation of a transistor!

    Ok, so I read that entire article but I am still confused on one aspect that this author doesn't seem to explain to me. You got the P-type base region and the N-type emitter region. when you take a P and N type material and stick them together they form a depletion region. I get that I took...
  15. J

    PIc microcontrollers....

    I think the ability of the picaxe to be programmed using flowcharts is also another exceptional feature. Not everyone is a programmer, but you don't need to be to understand a flowchart.
  16. J

    Noisy Neighbour Punisher!

    adam didn't leave anything brown in his diaper. How cool would that have been though?
  17. J

    polaroid tv capacitor replacement

    I third the warranty idea. Common sense tells you if the same caps blew twice then there is something more then a bad cap happening to that system. Now remember if you open up that box and do anything to void your warranty you will be costing yourself a lot more then 2 new dime caps.
  18. J

    DC Electronic Tutorials Section

    I see a spelling mistake. :)
  19. J

    Diode help on a cop bike

    You can just modify this design slightly adding in your relays after the switch. Hope it helps
  20. J

    low battery alarm

    Please explain this too me. The schematic shows an electrolytic capacitor. I don't understand how the capacitor can charge when the polarity is backwards???
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