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  1. Herschel Peeler

    Powering 104 LED's from Molex connector, possible?

    That sounds like wisdom to me.
  2. Herschel Peeler

    Powering 104 LED's from Molex connector, possible?

    Not suggested for long term use or reliability. "Works" does not imply "works well". A word of caution. On my flashlight about once every year or two I need to replace the LEDs in the flashlight. Not a big problem. I buy the LEDs by the hundred. It would be bad advice to say no resistor is a...
  3. Herschel Peeler

    Peltier

    I have no goal in mind. I have the stuff to do it and time on my hands.
  4. Herschel Peeler

    Peltier

    This could very well be the case. I could very well be overestimating the Peltier.
  5. Herschel Peeler

    Peltier

    Freon cooling with a heat exchanger, like a room air conditioning?
  6. Herschel Peeler

    Peltier

    Yes, an external fan cools the junction. The objective is to keep the electronics board cooler. I am expecting the liquid to be more effective than forced air. "Vehicle radiator" type I suspect will not get as cold as the Peltier junction.
  7. Herschel Peeler

    Peltier

    The junction removes the heat from the liquid. An external fan on the hot side removes that heat. The objective is to keep the electronics board cooler than with just forced air.
  8. Herschel Peeler

    Peltier

    True.. The only thing I am changing is medium. Air just sucks at transferring heat. It takes a lot of space and movement to be effective.
  9. Herschel Peeler

    Peltier

    Mine is a more complete assembly with heat sinks on both sides. Why do you think cooling a liquid would be different from cooling air? Air doesn't transfer heat as good as, say, antifreeze. All that changes is the medium being cooled.
  10. Herschel Peeler

    Peltier

    No argument on the efficiency. A marketable product is not the objective. Just curiosity of duplicating a system I saw in the works before. It was a kilowatt size RF generator for an aircraft application previously cooled by CO2. It had a high failure rate. The next generation used a Peltier...
  11. Herschel Peeler

    Peltier

    Ah, I see. Should I be worried about that? Plastic "shoe box" tank. Styrofoam top. Top mounted junction.. If it made a difference I guess I could make a Styrofoam box to put it in. First version will just use water and see how cold it gets.
  12. Herschel Peeler

    Peltier

    Where are we missing each other. Cooling side of the junction cools the liquid. electronics package to be cooled is in the liquid. I don't know why it wouldn't work to keep my cans of soda cool also. I'll try building something next week and let you know how it comes out. Does water transfer...
  13. Herschel Peeler

    Peltier

    Cool the fluid which cools the electronics.
  14. Herschel Peeler

    Op amps with one or no supplies in schematics

    LM13700 Pin 11 is +V but it is shown connected to the collector of the output transistor. TL084 has four op amps. No need to show power connections on each one.
  15. Herschel Peeler

    Converting LED to Street Light?

    Well, lets see, Typical old street light is 400 Watts putting out about 51,000 lumen. How many LEDs do you think you might use? Google "street light". There are a lot of LED and solar powered street lights available.
  16. Herschel Peeler

    Peltier

    I have a Peltier junction with a heat sink on both sides. I was going to put the cool side in a tank. A fan or pump circulates the coolant. The objective being to cool a heat sink of an electronics assembly. A fan on the hor side heat sink blows the heat away. Would the whole be any more...
  17. Herschel Peeler

    Need a diagram for 12V vehicle switch

    I agree with Harold. It looks like the switch is designed to work with an electronics module. You could confirm this by browsing a manual for your car at your local auto parts store. .
  18. Herschel Peeler

    Peltier

    I was thinking more in terms of cooling a tank of some liquid and using it to keep an electronics circuit cool.. Something non-corrosive and non-conductive that transferred heat well. Maybe keep the whole circuit board in the tank not just the heat sink of the circuit. With a fan or pump keeping...
  19. Herschel Peeler

    Peltier

    Liquid cooling interests me. Would antifreeze or liquid silicone be better than water? I got a glimpse of a liquid cooling system used in military aircraft for a RADAR jamming gear. It felt like liquid silicon was used to keep the VERY high power transmitters cool. Not efficient energy wise but...
  20. Herschel Peeler

    Trying to buy the right sockets for my PICs

    Yes, 0.100" pin spacing by 0.300" (7.62 mm ?) or 0.600" width is standard for DIPs. Yes, there are other standard sizes. I imagine PICs come in those also. Personal preference for me is Machined Contacts as opposed to side wiper kind. They cost a little more but if you are going to change them...
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