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  1. audioguru2

    Sine wave Inverter Project

    To make 230VAC with a sinewave, the output of the amplifier must be 650Vp-p. So it is practical to make a class-D amplifier with a low output voltage but a high output current then stepup the voltage with a transformer.
  2. audioguru2

    Electronic parasite zappers

    The schematic for the power supply circuit is in the other thread so I answered it there. In this thread you attached schematics and circuit boards that are different from each other. Totally confusing!
  3. audioguru2

    Transformer Power Rating

    Yes I think it will, if your power supply is strong enough.
  4. audioguru2

    Transformer Power Rating

    As I said at the beginning of this thread, a 28VAC transformer won't make 40VDC at its full loading, but if this circuit has positive and negative 40V then the amp will probably provide 85W into 8 ohms or 140W into 4 ohms.
  5. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    I don't know how to filter such a high power circuit. Some UPS's use a custom-made "ferro-resonant" transformer and have a sine-wave output. You didn't attach a circuit here. You attached a circuit without part numbers in another forum.
  6. audioguru2

    Relay Switching Problem

    Hi Shaiq, Connect the resistor to the COM contact which toggles between the NC when not activated and the NO when activated. You want two opposite things but it can do only one of them: 1) "i want to use the relay so that when it switches at some signal, it connects my 220ohms resistor to...
  7. audioguru2

    0-30 Vdc Stabilized Power Supply

    These are the parts and how it works:
  8. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi MonSSter, I don't think its negative supply is working. One end of R14 connects to the base of Q1. The other end connects to the -5.6V supply. Check the parts that are supposed to make the negative voltage. Without the negative voltage then Q1 conducts all the time and shorts the output of U2...
  9. audioguru2

    Electronic parasite zappers

    Watch out you don't poison yourself with those quack "medicines". I don't believe in that rubbish.
  10. audioguru2

    Electronic parasite zappers

    What is supposed to happen when you put a little 12V (actually 10V) pulse on your skin? I tried it and didn't feel anything. I didn't even feel better! ;D
  11. audioguru2

    0-30 Vdc Stabilized Power Supply

    If Q1 is connected wrong, shorted, doesn't have R13 and R14 the correct values or doesn't have a negative supply (-5.6V) for R14 then U2 will get hot. Q1 is supposed to turn on and short the output of U2 to 0V when the negative supply disappears quickly when the AC power is turned off so that...
  12. audioguru2

    solar light

    8 hours at 0.75A is 6Ahrs. Four Ni-MH rechargable D cells will power a light that long. A solar panel to charge them will cost about $100US, will be huge and will charge the battery only on very sunny days.
  13. audioguru2

    solar light

    Hi Robster, Krypton bulbs are incandescent and therefore are inefficient. An incandescent bulb uses electridity to heat its filament to a temperature of many thousands of degrees so that it glows. 90% of the battery's power is used as heat and only 10% is light. LEDs and fluorescent lights are...
  14. audioguru2

    500W_inveter

    Hello Aregee, You didn't say a word about the output stage of a sine-wave inverter you attached that works with PWM to be efficient. Does it work? How much power? Which Mosfets?
  15. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi Arge, Sure, a Switching Mode Power Supply (SMPS) can provide a high 10A output current and a variable voltage, but it has ripple at its switching frequency. This project is a linear power supply that gets hot and when when working properly doesn't have ripple. 
  16. audioguru2

    Theory discussion moved from Q/A

  17. audioguru2

    Theory discussion moved from Q/A

    Try measuring the current gain of a few hundred 2N3055 transistors to find one with a gain high enough to allow the little 2N2219 to be its driver in the power supply project. Try ignoring the very high ripple when its output voltage is only 25VDC and its current is more than 2.5A. The project...
  18. audioguru2

    New Tv.. help me out please

    Talk to a store that sells them about a lens, screen and mounting bracket. Ask them how to receive high definition TV in your part of the world.
  19. audioguru2

    New Tv.. help me out please

    Hi Wiz, That's a nice projector. It says it needs a lens. It also needs a screen and a mounting bracket. For TV to be really good you need to have cable TV or satellite TV that is High Definition. Then you can connect it to a good sound system of an amplifier and speakers.
  20. audioguru2

    0-30 Vdc Stabilized Power Supply

    Here, nearly everything has a detailed datasheet. We can select a heatsink that will cool perfectly.
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