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  1. MP1

    SK7804

    Thanks! I hate having parts in the bin with no data ;D I even tried an NTE cross reference for it on their website. MP
  2. MP1

    "Power?" Inverter

    audioguru, I looked at the author's forum and it does not look much different than threads on this forum. There were those who claim the inverter works and several who have problems with it. It could be due to instability of the design, the knowledge level of the project builders, mistakes in...
  3. MP1

    Power supply for AMP in CAR

    I went back through the posts and found the zapco post. There are quite a few schematic posts in this thread. You are trying to redesign an amp that is already on the market? Build a new amp? What is the purpose of this subject? This thread does not seem to have any direction. MP
  4. MP1

    Open Circuit Test

    siddharth, a continuity tester is not usually used to check through all components such as resistors and capacitors. This is a different device. A continuity tester is usually used to check that a non powered trace on a pc board goes from point A to point B with no interruption. Even when...
  5. MP1

    Open Circuit Test

    Nitpicking. I have lighted LEDs on my bench with a AA battery is why I mentioned it. So if you cannot get this to work with your LEDs, use two batteries. It is still a simple circuit. ...and, yes, as I mentioned, it will depend a lot upon the circuit that it is used on. Note that the original...
  6. MP1

    HELP ? ATX PSU LEADS

    audioguru, the regulation of the PSU will match the voltage. You need more current to allow this due to the added resistance of the wires. This is why you now see computer power supplies going up to 500W when they used to be only 230W. Voltage is only potential. It is the current that causes the...
  7. MP1

    "Cannot Connect", again and again

    I do not have a problem with connecting, but I have noticed delays between pages at times. No error messages. I had assumed it was high traffic times on the server. MP
  8. MP1

    Page views

    One alternative is to attach it as a zip file. You will not be able to see it in the post, but when you click on it, the picture should be viewable. There might be a better suggestion, but I cannot think of one. MP
  9. MP1

    Convert 0-30V 3A PSU to 5A or more

    ginji, thank you for the update on your progress. Good work! MP
  10. MP1

    Power supply for AMP in CAR

    ante, I am not sure what you refer to the zapco circuit? If you refer to the darlington pairs in the inverter project, the emitters are not directly connected to ground on the first transistor. This is only a problem when you have parallel transistors sharing a common ground on the emitter. MP
  11. MP1

    A/D Converters and Shift registers

    A great book for this and connecting all kinds of other devices to your computer is "Controlling the World with your PC" by Bergman. It gives you examples of circuits as well as the programs to write in Basic, C and Turbo Pascal. If you can find this book, I am sure you will not be disappointed. MP
  12. MP1

    Unknow current in transformer

    The question was how to find the current of the secondary. Unless some things have really changed since I was in school, you look for impedance on a transformer to calculate current. Impedance is the ratio of voltage to current. Z = E / I. This is the beginning. From there you go with the other...
  13. MP1

    Power supply for AMP in CAR

    No. I see no gain here and a question as to whether the circuit will function as originally intended with the voltage divider network that it will create. This is not the same as the resistors in the darlington configuration from the article. Note how you will be adding voltage dividers in...
  14. MP1

    HELP ? ATX PSU LEADS

    marsman, I have done what you are talking about, but I have not run the wires to such length. You will not have cross talk, but you will require more current than what you needed before. How many watts is this power supply rated? If it is an older computer with a small power supply (230 to...
  15. MP1

    Project Help

    Wow! You have been busy. I think the 1000KB attachment size limit is good since many have slow connections. It would slow down traffic on the site for larger uploads/downloads. MP
  16. MP1

    Convert 0-30V 3A PSU to 5A or more

    tuzvihar, That comment is still in debate. The person who made the comment has not built the project. Those who have already built this project have not given me a reason to believe there is a problem with it as yet. Welcome to the forum. I am glad to see someone who is actually building a...
  17. MP1

    "Power?" Inverter

    We need as many power inverters as contributors want to post to this site. There is no limit set for posting schematics. It is also important that when you are going to challenge a design, that you build the circuit, find the faults and then post your findings. Otherwise you only cause more...
  18. MP1

    Power supply for AMP in CAR

    The darlington article would seem this way if you only looked at the schematic and read the first few lines. If you read the article close enough you will learn that these resistors are not necessary and that they can be added to speed up the transition. Not to keep the supply from floating...
  19. MP1

    Power supply for AMP in CAR

    BTW, I think you are misinformed about darlington pairs. I have attached a pdf document with information regarding them. Darlington pairs are in nearly every IC on the market. MP DarlingtonCircuit.pdf
  20. MP1

    Power supply for AMP in CAR

    looks like the collectors are tied together to me. What schematic are you looking at? Perhaps I am on the wrong page. MP
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