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  1. CDRIVE

    Flashing 5watt led?

    In order to supply you with detailed information we need detailed information from you. What color LED will you use? What power supply will you use? What will the flash frequency and duty cycle be? Will this be portable? Chris
  2. CDRIVE

    Get a led working

    Can you post the schematic of what you have and make notations to it? Chris
  3. CDRIVE

    Frequency and Voltage change for elektromotor

    How does this translate to supplying you with 3PH? Chris
  4. CDRIVE

    Working on getting a Pierce Oscillator to Oscillate

    I think you'll find that because of Chinese manufacturing practices there are many scopes marketed under different manufacturer names and models but they're all the same scope made by one manufacturer. This practice is, by no means, limited to scopes. Chris
  5. CDRIVE

    dimmer for parallel or series LEDs with timer

    They can't be wired like that. You can't wire LEDs directly in parallel. Chris
  6. CDRIVE

    Shunt Resistors

    I'm disappointed. I was hoping someone would translate the entire post, especially this. :confused: Chris
  7. CDRIVE

    Working on getting a Pierce Oscillator to Oscillate

    Steve, since I posted that link I've also found similar information that you have, including very large inductors that make no sense to be anything other than a choke. I've tried to spice the Pierce to the point of my head exploding. I'm also questioning the information in my link. I think I'll...
  8. CDRIVE

    Door Latch opener switch

    More information please. Is the transmitter going to be a battery operated hand held device? What about the receiver end? Will it also be battery operated or will a wallwart suffice? Keep in mind that a solenoid, which is commonly used to pull the latch, will draw appreciable current. Chris
  9. CDRIVE

    cables for digital signals

    You haven't mentioned if you're talking about inches, feet, yards, meters or whatever. When a high frequency signal has to travel over distance it should be via a transmission line. UTP and coaxial cable are good choices but neither constitute a "Transmission Line" unless the source impedance...
  10. CDRIVE

    Working on getting a Pierce Oscillator to Oscillate

    Here's Pierce Osc. theory. Note the value of L is much lower than what's been discussed here. It doesn't appear to be a choke or function as one either. I like to think of RF Choke function as the inverse of a bypass cap. Neither are an element related to resonance or impedance matching...
  11. CDRIVE

    Got a question about driving LEDs? (Another work in progress)

    Unfortunately I don't know of any. I think Digikey's product filters come close though. Chris
  12. CDRIVE

    diode for collapsing magnetic field

    Well there you have it. One day we all wake up doing what we always did and Wham!! Machines wear out and so do we. ;) Get well soon. Chris
  13. CDRIVE

    Got a question about driving LEDs? (Another work in progress)

    If a comparison chart exists it would be nice to have a link in the categories section in post 1. I'm referring to a link maintaining a running chart of available LEDs containing basic specs like Vfd, Ifd (Cont), Lumens, etc. Chris
  14. CDRIVE

    Control circuit

    Have one on the fire now. Fortunately it's simple. ;) Chris
  15. CDRIVE

    Control circuit

    Yes you did. Yesterday while heating a cup of coffee I put the cup in the frig and the half & half in the microwave. Chris
  16. CDRIVE

    Control circuit

    What is this? :confused: That thread is yours. :confused: When did your name change from Will to Dave? :confused: Chris edit: Like this. Dave edited it. -- Steve
  17. CDRIVE

    diode for collapsing magnetic field

    Ouch! Very sorry to hear that. How did it happen? Chris
  18. CDRIVE

    URGENT help for an idiot

    That 5V spec @ Maplin is "Reverse Voltage". They spec the forward voltage as Blue Diffused= 4.5V, Blue Clear = 4V. These voltages seem high to me though. As Steve said 3.4V seems more realistic. Chris
  19. CDRIVE

    Model engineer needs help

    I know you dismissed PICs early in the thread and I'm equally certain that I mentioned Picaxe UCs. http://www.picaxe.com/ ANYONE can learn to program and use them in a few hours! They will run rings around anything you design discretely, with logic blocks or otherwise. Download the free...
  20. CDRIVE

    Model engineer needs help

    Excellent points Steve. Sometimes KISS isn't applicable. Chris
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