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  1. audioguru2

    i want an idea!!!!! please help me

    How many Watts? How many Whats? How about a modern audio power amp IC? Stereo? Surround sound? It won't be unique if you just copy one. Design it yourself, but you already did.
  2. audioguru2

    about mixer

    Hi Ana, Welcome to our forum. ;D I answered your post in our Theory forum before I saw this one. Please keep posts about the same thing in the same thread. Your mixer circuit is fine but I recommend that you use a low-noise, wide bandwidth audio opamp instead of the old, noisy and narrowband...
  3. audioguru2

    help me!!about a mixer

    Hi Ana, Didn't you look in our Projects section? Its button is at the top of this page. It has a 3-input mixer that is easily modified for 4 inputs. http://www.electronics-lab.com/projects/audio/009/index.html It isn't high-fidelity but it works.
  4. audioguru2

    Fridge door alarm circuit

    Transistors operate much better when they are wired correctly.
  5. audioguru2

    i need help extending the keys finder project. can someone help me out????

    What are its DC voltages without sound? What is a bottom face? Circuits with meg-ohms of resistance and high gain can't be touched. It should be in a plastic box.
  6. audioguru2

    confusing battery

    Hi Zeppelin, Ground has nothing to do with his two battery cells and only causes confusion. They can be joined by anything conductive.
  7. audioguru2

    0-30 Vdc Stabilized Power Supply

    The NE5534 is for a closed-loop gain of 3 or more without an extra capacitor as compensation, has diodes between its inputs and has an opposite voltage for its input offset adjustment. I wouldn't want to modify the circuit and pcb to use it.
  8. audioguru2

    please answer these two questions:

    What else can you use for power? How did the Egyptians make their piramids? You know what? The lady (?) across my street looks pretty darn strong. ;D
  9. audioguru2

    please answer these two questions:

    It depends where you are. Electrical energy from nuclear stations, waterfalls and windmills is fairly cheap here. Natural gas is plentiful and even cheaper here. The definition of a machine is a system that does work. A transformer doesn't do any work. Converting energy from one type to another...
  10. audioguru2

    Op amp theory Q's

    Nobody can hear frequencies as high as radio waves. Like I and the article said.
  11. audioguru2

    i need help extending the keys finder project. can someone help me out????

    Hi Logan, In the Whistle Responder project, if the mic can hear the Beeper then the beeper will never stop. I have written a detailed circuit description to help you get it working and a recommendation for a simplification and improvement to its circuit. If these pics look poor, then save and...
  12. audioguru2

    ICs..

    Just look at the datasheets to see what they are and how to use them. 1Ghz is a very high frequency so sure they use very high speed devices. They don't say which types of devices they use, does it matter? I copied part of the datasheet for the 1st one and you can see the others yourself at...
  13. audioguru2

    confusing battery

    It is too confusing and expensive to short the battery for current to flow. I showed how connecting a load to the battery will cause a predictable amount of current to flow. ;D
  14. audioguru2

    confusing battery

    Your battery doesn't have a load so current doesn't flow. Electricity needs two wires to close the loop for current to flow. I don't like Duracell so I chose Energizer, but connected them in series like your circuit, then added a 1k resistor as a load for 3mA of current to flow:
  15. audioguru2

    LM317 Variable power supply

    It looks like when the load draws too much current or is shorted, then the extra current through the diodes causes the LM317 to current-limit or shutdown. Good. ;D
  16. audioguru2

    i need help extending the keys finder project. can someone help me out????

    It will work a lot better when its parts are soldered on a pcb instead of with long wires picking up interference on an intermittent breadboard. I can add another transistor to blink an LED at 8Hz like the beeper, or make the LED light continuously when there is beeping. A bright white LED will...
  17. audioguru2

    LM317 Variable power supply

    Hi Zeppelin, Our project uses an unspec'd zener diode voltage reference operating at a current that is too low for good regulation. If a low-current zener diode is used and the resistor that feeds current to it is changed to give it its required current, and the other modifications to the...
  18. audioguru2

    LM317 Variable power supply

    They use 0.1 ohm equalizing resistors with them in the circuit you posted to cancel differences in the gain of the transistors and in the slightly different regulators' voltages. Then the excellent voltage regulation is ruined by the resistors and made good again by the gain of the opamp.
  19. audioguru2

    12V DC to 115V DC?

    Hot, cold and internal ground for the rotor. Two wires for the field coil. One green wire for the frame. You could connect it wrong with both sets of wires and it will run in the correct direction. Two wrongs make it right. ;D
  20. audioguru2

    LM317 Variable power supply

    Then you lose short-circuit protection, unless you add a 2nd transistor.
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