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  1. audioguru2

    HELP ? ATX PSU LEADS

    MP, I am sorry to continue to disagree with you. The current will NOT increase due to the added resistance of the wires, if the supply voltage remains the same. The resistance of the wires is in series with the load, not in parallel. Therefore the load will receive less voltage due to the...
  2. audioguru2

    "Power?" Inverter

    To all, Shall we re-engineer this dangerous (expoding capacitors) project and make it work (the author's web-site forum has many complaints about low output)? Well, the author recommends "more powerful" transistors, but many have tried 600V, 30A transistors and other ways, attempting to make it...
  3. audioguru2

    "Power?" Inverter

    MP, Thank-you for unlocking. Kasamiko, Capacitors have a "ripple current rating" which is related to their internal impedance (resistance) and physical size (to dissipate power) similar to a power resistor. In this project, the capacitors are charged to nearly 23V with a very high current...
  4. audioguru2

    water pump

    Hotwaterwizard, Sorry. No, you didn't say the same thing. Using bigger wires going to the pump will not reduce the voltage-drop along the wires going to his castle. The light will still blink when the pump turns on. But I see your point that the motor will draw more current when fed a reduced...
  5. audioguru2

    HELP ? ATX PSU LEADS

    A more powerful PSU will not increase the current because its voltage will be the same. You will need more VOLTAGE to overcome the voltage-drop of the long wires. Then it will require only a little more power. You may need to add capacitors at the CPU to smooth the digital hash.
  6. audioguru2

    Open Circuit Test

    MP, Most LEDs will not light with only 1.5V, and worse when the battery is exhausting. Voltages of LEDs: Common Ultra-bright Red:1.7V 2.2-3.5V Yellow: 1.9V 2.5-3.8V Green: 2.1V 3.1-5.1V Blue: - 3.1-5.1V White: - 3.1-5.1V That's why the little...
  7. audioguru2

    Power supply for AMP in CAR

    For all, In another web-site's projects forum, there was a request for an inverter to provide all the power for an electricity-heated home. Numbers such as 12,000 Amps at 12 Volts (144,000 Watts) were discussed! Enough batteries to fill a large garage! But they didn't think of charging them by...
  8. audioguru2

    Power supply for AMP in CAR

    MP, With the 8 ohm resistors gone, there is no voltage divider. The pull-down resistors turn-off the output transistors and discharge capacitances, when the driver transistors turn-off. Without pull-down resistors, the bases of the output transistors gradually (as their capacitances slowly...
  9. audioguru2

    Power supply for AMP in CAR

    MP, Don't you agree that those cheap resistors have nothing to lose and everything to gain?
  10. audioguru2

    "Power?" Inverter

    Ante, How many inverters do we need on this site? I think that the other one, the Low Cost 500W (or 700W) recently revised one, should be stripped-down (and will be explained), when someone requests a reduced power output. As you know, I expect projects to work the first time, every time.
  11. audioguru2

    Image problems with Thomsom TV

    Check with the company's policy about warranty on their "repair". If the TV is new and still has a manufacturer's warranty, demand that it be replaced since they can't fix it, but you will have to show them the problem happening. If the problem is intermittent, that is difficult.
  12. audioguru2

    water pump

    Use bigger wire going to your house, farm or castle. When the motor is turned-on, it will draw many, many amps of current until it is up to speed. A capacitor won't help much unless it is huge and expensive. A high-voltage, high-value capacitor wired in parallel with the motor will lower the...
  13. audioguru2

    basic capacitor question

    Hotwaterwizard, Your "delayed on relay" is a good circuit that will do the job, but with only a 6V supply, the input divider should be changed. If you use 220K for both divider resistors, and a 100 microfarad capacitor, I figure that the delay will be about 6 seconds. Use another 2N3904...
  14. audioguru2

    "Power?" Inverter

    Hi Guys, Why is this simple multivibrator inverter included in the Projects Section of this high-quality site? It is here: http://www.electronics-lab.com/projects/power/018/index.html The author claims that it will deliver 300W as shown. Has anyone built it? Unfortunately, it has problems: 1)...
  15. audioguru2

    Unknow current in transformer

    MP, I have never heard of measuring the resistance of a tranformer's windings to determine its voltage ratio. The resistance of each winding is not only dependent on the number of turns (length). It is also dependent on wire size. For a voltage step-down transformer, thin wire is sometimes used...
  16. audioguru2

    HELP ? ATX PSU LEADS

    Marsman, You could separate the CPU and PSU only if you use very heavy wire (or copper pipes), which is very impractical. However, some PSUs have "remote sense" wires that allow the PSU to adjust its voltage to make-up for the voltage drop of long wires that you desire. Maybe your PSU already...
  17. audioguru2

    10 Led chasser

    Steven, Wow! You did a fine job doing that many-wires project. If I ever need a pixel-screen built, I'll call you.
  18. audioguru2

    Night rider scanner

    MP, Thanks for fixing the Projects Index. Isn't it possible to include the animated GIF into the "Knightrider LEDs for Model Cars" project? I have a solution for anyone who complains that the GIF shows 10 LEDs but the project has only 6.
  19. audioguru2

    "Cannot Connect", again and again

    Is anyone else having this frequent problem, when I try to get to this site, or posting or going back a page: "Cannot connect to server, connection cannot be established", or "Web site found, waiting for reply", then waiting and waiting. ??????????????
  20. audioguru2

    Power supply for AMP in CAR

    MP, Thanks for posting the article about darlingtons. There it is, in the schematic on the 1st page, a darlington showing pull-down resistors, and exactly the same description for their function that I gave. Sorry to continue this argument, but ONSemi (Motorola), in their MC34071 opamp, use...
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