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  1. Fish4Fun

    Halloween Project Help!

    High Power LEDs are considerably easier to use, are low voltage and come in several colors. You could "strobe" them in the uS time domain with little more than a uController and a mosfet. That's where I would start. Fish
  2. Fish4Fun

    Halloween Project Help!

    Tesla coils are always fun (rarely safe, but always fun, hehe ) Depending on what you want there are lots of options. Some of these new high-power LEDs can truly light up the world. A Zeon bulb or camera flash are possibilities. Not sure what your background is, but you are likely going to...
  3. Fish4Fun

    Help on circuit

    I decided to take today off and work tomorrow, so I had a bit of time to get the prototype PCB ready: Little bit bigger than advertised. Didn't leave myself quite enough room for the series gate resistor, but I will fix that before I cut more of them. The edges got messed up when I was...
  4. Fish4Fun

    Looking for ACTUATOR / CONTROLLER suggestions.

    Hrmm, let's have a go @ this. First, do you plan to build or buy the linear actuator? Regardless, what kind of accuracy & or resolution do you require? What is the project budget? How fast does the actuator need to move? Are you REALLY looking for a linear actuator like this...
  5. Fish4Fun

    Help on circuit

    Dennis, As far as PCBs go, most of the cost is typically in the design. Once you have your artwork the next factor is quantity. Typically the price per PCB is a function of the total area and number of layers. Here is an ebay example...
  6. Fish4Fun

    Help on circuit

    @Chris==> AVR? Cause I have a bunch of them on hand. Mosfet? It is what I have on hand. So, in both cases I did not choose the best parts for the circuit, I chose the best parts for the circuit that I have on hand ;-) In the event I can't get this Mosfet to perform properly, do you have a...
  7. Fish4Fun

    Help on circuit

    @drcarnine==> This is what I use: http://store.atmel.com/PartDetail.aspx?q=p:10500053#tc:description Likely can find a cheaper solution, but this is pretty bullet-proof. Are you planning to make your own PCBs? While certainly not hard to achieve, it can get messy//expensive. I use a...
  8. Fish4Fun

    Uln2003 Stepper motor controller help

    Josh, I will again mention that using a Windows based computer to drive timing critical devices like stepper motors is going to be problematic. The Windows OS "time slices" and only does tasks during the allotted time slice. This means that if you send a series of bytes to the parallel port...
  9. Fish4Fun

    Converting Russian Calculator to 9v DC

    @Solidus==> Thanks, those are VERY cool! I was completely unaware of that technology, so of course I had to go order a few for my display collection :-) Now if I could just find something that needed a display....hehe. Fish
  10. Fish4Fun

    Help on circuit

    I have an LED project that has been waiting for a "round-to-it". I already have all of the parts on hand. Sooooo, if I get time in the next week or so I will try to see if I can modify my PCB to do your task as well (99% sure I can) If so I will just send you a couple populated PCBs with the...
  11. Fish4Fun

    Ammateur Help - Power on/off switch

    Well I would ASS-U-ME you have a battery or power supply appropriate for the fan?????? If so, then yes, all you need is a switch to 1) turn the power supply on/off, or 2) turn the fan on/off. Or were you looking for a "Fan Controller" maybe? Fish
  12. Fish4Fun

    Help on circuit

    Hehehe No, I was thinking more like an ATTINY13 or ATTINY2313. http://www.ebay.com/itm/NEW-1pcs-ATMEL-SOP-ATTINY85-20SU-/331020237802?pt=LH_DefaultDomain_0&hash=item4d1257fbea How big a hurry are you in to complete this project? The entire circuit should be about the size of three...
  13. Fish4Fun

    Driving Peltier Device through L298N to control Temperature

    hehe, kinda what I was thinking ;-)
  14. Fish4Fun

    Ammateur Help - Power on/off switch

    Do you mean something like this: http://www.ebay.com/itm/NTE54-394-Pushbutton-Switch-SPST-3-Amps-Red-54-394-/161103345294?pt=US_Pro_Audio_Parts_Accessories&hash=item258281f68e Your local Radio Shack will have tons of choices in switches from push to toggle. simply run a lead from the...
  15. Fish4Fun

    Help on circuit

    Hrmmm, at the risk of going all digital.....how about a small uController, and a mosfet? drive the mosfet from PWM output and increase the duty cycle over time? This could sit nicely between the PS and the LED light with NO modification. If you use an AVR I will even write the code for you...
  16. Fish4Fun

    Driving Peltier Device through L298N to control Temperature

    If I could make a suggestion, why wouldn't you just use a relay to reverse the current? I mean I love an H-Bridge as much as the next guy, but a relay has guaranteed break before make with built-in dead time between. I just cannot imagine why you would need an H-Bridge here. Maybe I am...
  17. Fish4Fun

    Converting Russian Calculator to 9v DC

    @==>*steve* Why would you say the display might require 90V? It appears to me to be an LED display and while I am not any kind of expert on displays, I have never encountered an LED display that required more than 12V. The fact that there are 7 wires leading from the PS board to the main...
  18. Fish4Fun

    24VDC circuit breaker recommendation

    Why not just use a 1 Amp fuse? If you need to test it a lot, how about an LED? Or a 24V relay that "latches". Most circuit breakers have a much higher current rating than 750mA and really aren't designed as "indicators". Fish
  19. Fish4Fun

    Uln2003 Stepper motor controller help

    @Enns==> One of my concerns from the beginning has been that it appears from the picture you have bipolar steppers. The ULN2003 driver is for unipolar steppers. Before you go any further you should REALLY verify the type of steppers you have. Fish
  20. Fish4Fun

    LED project for a crown

    ebay can be your friend: http://www.ebay.com/itm/10-x-CD4017-4017-DECADE-COUNTER-DIVIDER-IC-TEXAS-BRAND-USA-SELLER-Free-Shipping-/230945169243?pt=LH_DefaultDomain_0&hash=item35c5679f5b This was only the top result of over 4000. Fish
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