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  1. audioguru2

    RF Choke vs Inductor?

    I don't know if a 1mH inductor will work in your crystal oscillator circuit. Its inductive reactance calculated at 125k ohms seems awfully high. Try it.
  2. audioguru2

    Low-pass Filter?

    You could use a low voltage, high current Class-D amplifier to drive an ordinary power transformer in reverse to stepup the voltage. You could use a high frequency oscillator to drive a small stepup transformer, rectify its high voltage then use the DC for a high voltage Class-D amplifier...
  3. audioguru2

    want mobile jammer circiut

    If you want an antenna amplifier, don't post on a thread that is talking about jamming cell phones, start your own thread.
  4. audioguru2

    want mobile jammer circiut

    In North America there is free satellite TV. It operates in microwave frequencies so a jammer would be difficult to make, and the dish focuses very accurately so the jammer must be in its focus.
  5. audioguru2

    Low-pass Filter?

    There are many high power Class-D audio amplifiers available. I don't think a computer's power supply works with a square-wave mains. A "ferro-resonant" transformer has an additional winding that is tuned with a capacitor so a square-wave input makes a sine-wave output. Its core saturates in...
  6. audioguru2

    RF Choke vs Inductor?

    A choke is an inductor. A choke is usually used separately as a high impedance to high frequencies. An inductor is usually used with a series or parallel capacitor to tune to a certain frequency. Look at applications in Google.
  7. audioguru2

    0-30 Vdc Stabilized Power Supply

    The original project's circuit or the improved one?
  8. audioguru2

    Low-pass Filter?

    Are you talking about a power inverter? What about the heat? In a square-wave inverter, the output transistors alternately switch fully on or fully off to reduce power wasted as heat. A good inverter using transistors is about 80% efficient and one using Mosfets is about 90% efficient. So to...
  9. audioguru2

    heat sink for transfomer

  10. audioguru2

    heat sink for transfomer

    A very poor quality (cheap) transformer heats too much: 1) If it doesn't have enough turns in its windings then it heats even without a load. 2) If the wire in its windings is too thin then it has too high a resistance which causes heat with a load. Then the voltage will be much higher without a...
  11. audioguru2

    mini audio transformer

    Instead of trying to buy a 40 years old audio transformer to use in a high voltage circuit, use something modern that makes a high voltage. A disposable camera has a high voltage circuit that has a nice little transformer and the entire circuit to make about 350VDC and a pulse of about 4,000V...
  12. audioguru2

    mini audio transformer

    About 40 years ago, portable transistor radios used a transformer something like that. Make a time machine and go back to get one.
  13. audioguru2

    0-30 Vdc Stabilized Power Supply

    This supply can be "floating" so that its output isn't grounded. Then for a positive output just ground the 0V terminal and for a negative output just ground the positive terminal. For both polarities then add a completely separate project.
  14. audioguru2

    0-30 Vdc Stabilized Power Supply

    To allow you to calibrate its max output to 25.0VDC, add a 5k trimpot wired as a rheostat between U1 and P1. If the ripple is too high with a 25V/3A load then increase the value of C1 to 10,000uF and decrease the value of R15 to 100 ohms.
  15. audioguru2

    0-30 Vdc Stabilized Power Supply

  16. audioguru2

    plz help me out !!

    Because photodiodes don't work when they are backwards.
  17. audioguru2

    FM impedance antenna matching

    Doesn't the high RF power interfere with real FM stations ot TV stations?
  18. audioguru2

    LM317 Variable power supply

    Then calculate a current-limiting resistor with the supply voltage that you have so that the max current spec is not exceeded.
  19. audioguru2

    Newb Question: 12v-80ma transistor switch

    Good for you. You fixed it. ;D
  20. audioguru2

    0-30 Vdc Stabilized Power Supply

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