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  1. audioguru2

    free energy motor

    (Sarcasm) All my neighbours drive cars that use overunity motors and they drive for free! My refrigerator, vacuum cleaner and fans all have overunity motors and run for free! Most people are afraid of the new (old?) idea of the thing with coils because it might attract too much power and blow...
  2. audioguru2

    OPA2134 Vs NE5532

    Hi Shahriar, Here is a site with many audio opamps tested for distortion with different loads. The author's test equipmet can measure down to "only" about 0.005% distortion so most opamps test about the same. The old 741 opamp is shown to have terrible distortion at high audio frequencies. Some...
  3. audioguru2

    Question for Electrician about unsafe voltages

    The 15V was 25% higher than it should be and probably blew up a circuit in the cameras, or you connected the 12V backwards.
  4. audioguru2

    white led

    The high voltage power transistor is fine. With an LED current of 25mA then the base current is about 1ma. You will need a high voltage resistor or some ordinary ones in series to turn on the transistor. High voltage zener diodes have a problem with temperature and leakage current. Use...
  5. audioguru2

    Hearing aid circuit

    The only way I could make the second part of the circuit work with a 1.0V battery is when I added an emitter resistor to Q3 like this:
  6. audioguru2

    Microphone Amplifier

    Look at XLR Connector in Google. It shows the balanced signal pins and the ground pin of your microphone. Shure's datasheet for your microphone also shows which pin is which. Most of the "horrible" schematics of preamps with only two wires for the mic are for cheap toys. Your Shure professional...
  7. audioguru2

    OVER-/UNDER-VOLTAGE PROTECTION CIRCUIT ANALYSIS

    You cannot use a comparator to replace an opamp in most circuits. We were discussing what might happen if a comparator replaced the U3 opamp in the regulated voltage and regulated current power supply. The output of the comparator would be linear during current regulation, its collector...
  8. audioguru2

    500W sine wave inverter design

    A square-wave inverter can power most heating appliances, incandescent lights, some fluorescent lights, some fixed speed electric motors and some multi-voltage TVs.
  9. audioguru2

    free energy motor

    We have laughed at OVERUNITY before. It is impossible. It is a farce. It is a scam.
  10. audioguru2

    Microphone Amplifier

    Hi Vivek, I haven't seen a preamp circuit for a dynamic mic for many years. I use electret mics now. Look for Dynamic Microphone Preamp Circuit in Google. There are many circuits, some are good and many are horrible.
  11. audioguru2

    Hearing aid circuit

    Never mind the battery voltage. This circuit doesn't work. It is an example of "how to make a transistor amplifier wrong".
  12. audioguru2

    white led

    I don't know which high voltage transistors are available in your country.
  13. audioguru2

    satellite speaker problem

    No, an active filter using opamps does not have power. It drives a power amplifier. The passive crossover project here has an error with the phase of the wooofer and tweeter that results in a deep notch at the crossover frequency. I switched the phase of the tweeter to correct it. It is designed...
  14. audioguru2

    satellite speaker problem

    Don't you want stereo? Then use a satellite speaker for each midrange. Then a real tweeter will be for the high frequencies on each channel and a woofer can be for the bass on each channel.
  15. audioguru2

    white led

    Hi Pier, An ordinary Triac or SCR is not turned off with its gate. The gate is used to turn it on and disconnecting its power source (like with each cycle of AC) or disconnecting its load current turns it off. Use a high voltage transistor instead. I think high voltage zener diodes are very...
  16. audioguru2

    satellite speaker problem

    Each satellite speaker needs a highpass filter part of a crossover network connected to a power amplifier. Maybe the satellite speakers have a highpass filter built-in. Then the satellite speakers will play the middle and high frequencies. A woofer or two need their own lowpass filter part of a...
  17. audioguru2

    formulas

    The only formulas for transistors that I can think about is the ones that are how they are made. Just learn how transistors work then look at the spec's for one on its datasheet. Look at its current gain (it is a range of gain numbers) and give it enough base current for the collector current...
  18. audioguru2

    350w Studio Anfi Full Proje

    I downloaded the original circuit in June, 2006. Is the new download different?
  19. audioguru2

    OVER-/UNDER-VOLTAGE PROTECTION CIRCUIT ANALYSIS

    It will probably oscillate. Its output will be floating if the load current is less than the set amount of current regulation. Its output voltage will drop just low enough to regulate the current if the load current is higher than the set amount of current regulation. If it is not regulating the...
  20. audioguru2

    350w Studio Anfi Full Proje

    The 350W amplifier project from Silicon Chip magazine was 3 years ago. Did they update it? Where is the link?
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