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  1. audioguru2

    350w Studio Anfi Full Proje

    Where is the new link and schema?
  2. audioguru2

    OVER-/UNDER-VOLTAGE PROTECTION CIRCUIT ANALYSIS

    Indulis, The question about a comparator was, "what is its output (voltage) when both inputs have exactly the same voltage". I answered that it depends on the input offset voltage and will be either at the positive supply (of course it must have a load resistor), saturated at ground or full of...
  3. audioguru2

    0-30 Vdc Stabilized Power Supply

    An OPA27 might work but a de-compensated OPA37 cannot be used. It will oscillate. No, the circuit is designed for an NPN transistor.
  4. audioguru2

    free energy motor

    Why do you preach about magical electricity that nobody uses? About an electric motor that runs all by itself?
  5. audioguru2

    Hearing aid circuit

    It is more complicated than that. The source impedance must also be included since if it is low then the AC negative feedback is reduced which makes the AC gain higher. My sim program is SwCAD III free from Linear Technology. The transistors have a wide range of hFE from 110 to 900. I...
  6. audioguru2

    Power Supply and Multimeter at 3,3 Ampere...

    3A in 0.47 ohms is 4.23W. A 5W resistor would be extremely hot. A 9W or 10W one would be cooler. I have seen many 10W resistors but never a 9W one. A 9W 0.47 ohm resistor would be fine.
  7. audioguru2

    free energy motor

    Now you are a preacher. You need to learn the laws of physics.
  8. audioguru2

    Accuphase Power Amplifier Upgrade!

    The amplifiers are different. The new one doesn't have any details. You can't easily change a cow into a horse.
  9. audioguru2

    free energy motor

    We talk about electronic circuits here, not poetry and magic.
  10. audioguru2

    Power Supply and Multimeter at 3,3 Ampere...

    Hi Steev, You project will have very good performance. 10,000uF is fine for C1. You changed the value of R7 by 8.5%. Then the max current might not be 3A, depending on the actual value of the current-setting pot and other resistors. Some people add a trimpot in series with each pot for...
  11. audioguru2

    Hearing aid circuit

    I forgot, Q2 is also saturated. The circuit is not a hearing aid, it is a fuzz circuit for an electric geetar. Have you ever seen a hearing aid without a volume control? New ones have an automatic volume control.
  12. audioguru2

    OVER-/UNDER-VOLTAGE PROTECTION CIRCUIT ANALYSIS

    I don't need to prove or justify why the manufacturer of an LM393 comparator specifies that it has a voltage gain of typically 200,000. I didn't say that its output will go to 200V. I said when it amplifies an input offset voltage of 5mV by 200,000 times then its output will try to go to 200V...
  13. audioguru2

    free energy motor

    No. A magnet is attracted or is repelled by an air-core coil if the coil has current in it. A magnet is iron. If a magnet is near an air-core coil then the magnet becomes the core. An iron core makes an electromagnet more efficient. In your "generator", nothing moves. Can't you see that is...
  14. audioguru2

    Hearing aid circuit

    Hi Walid, The mic and its load/powering resistor is about 2k ohms. The 1st transistor has negative feedback through its base bias resistor so its bias voltage will drop a little when the resistor value is reduced and its its voltage gain will drop a lot. Its input becomes attenuated. The...
  15. audioguru2

    OVER-/UNDER-VOLTAGE PROTECTION CIRCUIT ANALYSIS

    The voltage gain is too high in a comparator to use its full open-loop gain with slowly changing inputs. It will amplify its input offset voltage and amplify its internal and external noise. It will probably oscillate due to the input picking up the signal from its output. So hysteresis is used...
  16. audioguru2

    RF circuits -> Small Radio Transmitter

    Can it be received as far away as across the street? Does its frequency change if anything gets near it and when its battery voltage runs down? Does it sound like there are no treble audio frequencies when it is heard on an FM radio?
  17. audioguru2

    Help! Connecting power supply to small load/solenoid

    The magnetic field in a solenoid sets up a voltage across it that opposes the applied voltage, during the slow build up of the current. The solenoid is an inductor that builds up current slowly. When the current reaches the max then it is exactly the same as in a resistor with the same...
  18. audioguru2

    Power Supply and Multimeter at 3,3 Ampere...

    Hi Steev, Read the big long thread about improving the 0V-30V power supply project. Q2 will smoke and melt if Q4 has a low current gain, the output voltage is set low and the current is high. I recommend replacing the dinky little 2N2219 transistor with a real TIP31A power transistor that has a...
  19. audioguru2

    free energy motor

    This is just a bunch of made-up words that don't mean anything. You cannot get electric power "from everywhere in the universe". A photo-diode makes a tiny amount of electricity if a very bright light shines on it. Photon Flux? You cannot run an electric motor without a power supply.
  20. audioguru2

    free energy motor

    An electric motor cannot run without being powered. It has losses such as friction and heating of its coils. The circuits you posted were for an orsdinary brushless DC motor that is powered by a battery and uses 15A transistors. Perpetual motion is impossible.
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