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  1. Fish4Fun

    Motor for moving head

    I would suggest making your moving parts from foam (available in 4x8 sheets from 1/2in to 2" in thickness from your favorite building supply center), this will greatly reduce the requirements for your motors. If a constant speed is good, then an AC gear motor is a great choice for places with...
  2. Fish4Fun

    Uln2003 Stepper motor controller help

    LOL @ Chris ==> Yes, from 8-13 and 19-2x I am 100% with you, but (sadly?) there was a period in there where my main distraction was not electronics, Yes, I have a manual mill and small lathe along with the other various machines one needs to work metal, and I do love the solitude there, but...
  3. Fish4Fun

    heating alternatives

    donkey, First, to be clear, you do mean 500mm x 500mm, not 500mm^2 ? The key to even heating in both your table and cooking is to increase the thermal mass between your heating element and your work/food. Consider this: if you heat one spot on a piece of aluminum foil, do the edges get warm...
  4. Fish4Fun

    Uln2003 Stepper motor controller help

    The breakout board you listed is exactly that, a breakout board. There is very little documentation posted about it, but I ASSUME since it comes with a CD that it has a driver. How flexible the driver is, is anyone's guess, but I would ASSUME that it will at the very least give you some type...
  5. Fish4Fun

    Uln2003 Stepper motor controller help

    I just did an e-bay search on stepper drivers, and I am amazed what is available at affordable prices! This is just 1 example: http://www.ebay.com/itm/CNC-Router-Single-1-Axis-3-5A-TB6560-Stepper-Stepping-Motor-Driver-Board-Control-/231041654828?pt=LH_DefaultDomain_0&hash=item35cb27e02c That...
  6. Fish4Fun

    Uln2003 Stepper motor controller help

    LOL! Yes ENNS, that should certainly do it! I hope you will keep this thread updated with your build progress. If you need help/suggestions relating to CNC that do not involve the electronics portion of your project, feel free to PM me and I will give you a link to a CNC forum where the...
  7. Fish4Fun

    Controlling shift register via USB

    Hey Kermit, welcome to the forum! The biggest problem with Serial/Parallel Port control of timing critical devices is not your PC, but you OS. If you are using Windows it is very difficult to get "precise timing". It **might** be better to simply use something like an Arduino "in the middle"...
  8. Fish4Fun

    heating alternatives

    Yes, 1/4 the power: E = IR --> I = E/R P = IE --> P = E^2/R Therefore for E1 = 1/2E with R = Constant ==> P1 = 1/4 P What I could not remember was the change in resistance with respect to temperature, but I have gone back and checked that: For temperatures: @ 1000F (538C)...
  9. Fish4Fun

    need to build water sensor with pump and switch

    Hrmm, why not just use a check valve? ==> Let's water out, won't let water in. Ebay has some small 12V pumps and float switches, not sure how "waterproof" the pumps are, but you could put the pump in a water tight enclosure with an "in-tube" and an "out-tube". A small marine bilge pump might...
  10. Fish4Fun

    Looking for a spacer/stand-off to hold through-hole

    I do not have any experience with Wave Soldering; however, I have had plenty of experience with components that don;t want to stay where they are suppose to, lol. I have used a small "spring clip" and clamped it to the leads which prevents it from slipping too deeply into the holes. I have...
  11. Fish4Fun

    heating alternatives

    Hrmm, I have not played with 3D printers yet, only casually observed; however, I have some experience with heating things :-) A lot depends on budget, space and configuration of the machine. Most of the 3D printers I have seen have a stationary bed which can make the task easier. While not...
  12. Fish4Fun

    Driving Peltier Device through L298N to control Temperature

    I have played with TECs a fair amount, amazing devices; however, they are lossy beasts! They are at their best in cooling applications where the target temperature is greater than ambient, for instance CPU cooling. They are at their worst when attempting to cool something below ambient. If...
  13. Fish4Fun

    Uln2003 Stepper motor controller help

    @ --> Chris I am a bit confused why you think a parallel port OR a serial port will not work as a signal source? Both will in fact work quite nicely as long as you are using DOS or some other OS that allows direct control over the Ports. As a matter of fact, Mach3 (a Windows App), is...
  14. Fish4Fun

    Uln2003 Stepper motor controller help

    Hey Josh Welcome to the forum! First, I am glad to see someone your age interested in electronics and stages! This is a typical 28BYJ-48//ULN2003 Stepper/Driver...
  15. Fish4Fun

    Small dc motor controller options

    pebe, Welcome to the forum! By "linear" he means the motor is a 12Vdc brushed motor. And yes, he needs a PWM controller that takes an analog input from 0-10V. There isn't anything particularly difficult to design/build, but he needs/wants an "off-the-shelf", "ready to use" controller on a...
  16. Fish4Fun

    Small dc motor controller options

    Learning electronics => Good! Saltwater System => I have owned a saltwater fishing tackle store with live bait for the past 28 years. Is a microcontroller required? Absolutely NOT, but it is likely the cheapest/easiest approach in small quantities (<1000 copies). Even if someone were...
  17. Fish4Fun

    How to DIM LED with Constant Current Driver?

    h2k, I think stepping back for a moment will help. Steve has a fabulous grasp on PWM and is explaining it using precise diction, I think you need an analogy. Inductors and capacitors are similar to water tanks in that they "store something". A water tank obviously stores water while...
  18. Fish4Fun

    velleman fm radio kit 118rs add aux input.

    Tritron, Welcome to the forum! In general it is polite to provide a schematic of a circuit in question when asking specific questions about modifying it. The assumption that there are people intimately familiar with any given schematic and can from memory give helpful suggestions is generally...
  19. Fish4Fun

    Getting image

    1) Ultrasound => http://www.nlm.nih.gov/medlineplus/ency/article/003775.htm 2) MRI ==> http://www.mayfieldclinic.com/PE-MRI.htm#.UiXAqD_rxOA 3) CT Scan => http://www.vascularweb.org/vascularhealth/Pages/ct-angiography.aspx 4) Autopsy.
  20. Fish4Fun

    Small dc motor controller options

    OK, first I assume you have little experience with electronics, and I do not mean to be unkind, only making sure we are on the same page. Next, the circuit you linked is a simple PWM speed control, using a 555 timer IC and a POT to control the duty cycle. It is absolutely possible to design a...
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