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  1. dorke

    Resistor Over Heating

    And what does a LED have to do with this case? Read the datasheet!
  2. dorke

    Resistor Over Heating

    Read the datasheet. Why in the first place ,do you think it will burn?
  3. dorke

    Resistor Over Heating

    NO,wrong answer! You have an R-C filter at the Vmot input pin. Actually the best way would be eliminate the resistor completely (R=0) look here.
  4. dorke

    Resistor Over Heating

    Do you understand why you have the resistor in the first place? And yes there are many ways...
  5. dorke

    LTC3780 Buck -Boost Controller

    An SMPS design has so many pitfalls . The LTC3780 isn't the simplest one to design. For a first design it may be well above your skills. You can not expect it to work on the first try. How did you build it?show photos. Passive part selection is also critical for a working circuit. What...
  6. dorke

    Quick Question: Open Loop inverting opamp

    If you use a commercial op.amp it is given in it's datasheet. Given a specific circuit with all parameters of the transistors and other devices you can calculate it. In both cases it can be measured, taking care of "problematic issues" in the operation and measurement, Not the place to...
  7. dorke

    Led

    Welcome to EP. Are you sure the problem is with the 7 segment LED display itself? How many do you have on the board?
  8. dorke

    LTC3780 Buck -Boost Controller

    Welcome to EP. Do you have any experience with SMPS design or is the the first one for you? What equipment do you have for testing? Please upload some photos of the actual build.
  9. dorke

    Quick Question: Open Loop inverting opamp

    It exists,but should not be used !!! Basically it is an amp. that doesn't have feedback (i.e. connection of output to input). without feedback an amp. would have all possible disadvantages in the world. It sounds strange but, Negative feedback is actually very Positive, a bit of an "oxymoron"...
  10. dorke

    Two separate 28VDC power sources powering 2 different diodes on same bar and ground return

    Not a problem. Ground wires should be same thickness. Preferably a "star ground" scheme as shown. if there are other blocks connected in the system,they should be connected to the star ground.
  11. dorke

    Two separate 28VDC power sources powering 2 different diodes on same bar and ground return

    Things are not clear yet. Are points C,D connected? Can you please show the grounds of "the parts" in more details.
  12. dorke

    SSR triac not releasing

    Connect a DVM to the input of the SSR. Measure with the DVM the voltage on the input ,in the "off" and "on" state. For off you should have less than 1v for on more than 3V,are you actually getting this?
  13. dorke

    Two separate 28VDC power sources powering 2 different diodes on same bar and ground return

    What do you mean by "initial diode"? A schematic is needed if you want help. You can draw one yourself,doesn't have to be the original one.
  14. dorke

    What Are These Parts Called- Where Can I Get Them?

    Welcome to EP. They are called terminal Blocks. Used for connecting wires. The last ones could be ( 3 phase?) circuit barkers or relays. A store selling Electricians gear will have them.
  15. dorke

    Faulty 9VDC Power Supplies

    No problems,actually higher Cap value is better. They use the minimum value and voltage because they yield lower size and cost. Yep, tropical islands paradise ,Hurricane season can be a scary experience though.
  16. dorke

    Faulty 9VDC Power Supplies

    Yes you can use a 470uF, voltage can be higher than 16V as well. But note that your space is very limited and larger value caps as well as voltage may be to big to fit in. BTW, it is strange you couldn't find a 330uF.
  17. dorke

    Creationism/Intelligent Design

    In the biological world the "first transistor" was apparently developed in 2010. The issue is a total headache regarding the moral side of things. It has a great promise to cure diseases and genetic problems but, It is also very frightening. History shows very clearly that any technology will...
  18. dorke

    Creationism/Intelligent Design

    Hop, you weren't the only person to fail to recognize the bright economical future of computers ,most of the world was, including some very smart and in the "know-how" core of things. Look here ...even "the man" himself appears at #7. Just now Toys- are-Us went belly-up ,because of that "tiny"...
  19. dorke

    Creationism/Intelligent Design

    We are on the verge of creating pseudo-life. By that I mean intelligent beings that can reproduce themselves and even improve from generation to generation,there is also the possibility for "eternal life" for them. We call them robots. In my view, being able to reproduce(i.e. manufacture "new...
  20. dorke

    Legality of non-amateur band receivers

    Transmitting is strictly illegal without a license! With a license it is allowed only in specific bands. The main reason being, it may cause interference with other operating comm equipment. One major concern is air traffic control,this may be a life threatening event. There are a lot of...
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