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  1. Audioguru

    Audio splitter With Amplification

    For headphones you should forget about using this amplifier.
  2. Audioguru

    Advice on splitting voices

    Take one mic preamp and it feeds six RTS0072B circuits that have their pin 5 grounded and you adjust the pot on each circuit for the voice frequency you want.
  3. Audioguru

    Audio splitter With Amplification

    The PAM8403 amplifier has bridged outputs so the "splitter" cannot be used because it will short circuit the half of the bridged output of one channel to half of the bridged output of the other channel. Also, the PAM8203 amplifier has a gain of 24dB (16 times) which is too high unless you turn...
  4. Audioguru

    Help with simple LED circuit.

    The PIR has a weak output that can turn one small low current LED suddenly on and suddenly off. You need a current-boosting circuit that is designed to drive the high current of your groups of LEDs and each circuit can be designed to fade on or fade off.
  5. Audioguru

    Audio splitter With Amplification

    Your music source is designed to drive one pair of headphones, 5 in parallel overloads it which reduces the volume and causes distortion. You need to boost the current, not the voltage. The ebay LM386 amplifier has a voltage gain of 200 (!) which is way too high. If you fiddle with its tiny...
  6. Audioguru

    Advice on splitting voices

    The first time I looked at the datasheet it had only the first page and a page written in Chinese. Pin 5: "The voice effect are adjusted ...." Does this pin activate the other adjustment pins? Pin 6: "Amplifying voice effect or Transposing voice effect". What do they do? Pin 7: "Robot voice...
  7. Audioguru

    Advice on splitting voices

    Your voice has a fundamental frequency and many harmonic frequencies but I do not think you want to hear only a harmonic frequency. I think you want to change the frequencies of your voice. Maybe you want it to sound high pitched like a little girl or sound low pitched like a monster. A quick...
  8. Audioguru

    rgb led specs & control

    ebay, the person selling the cheap Chinese LEDs and the manufacturer do not know anything about electronics. Forward current has an absolute maximum value, above which causes meltdown, it might be 1000mA. The 350mA rating might be what they recommend for a long life if it has good cooling. Or...
  9. Audioguru

    Zenor Diode tests as a regular Diode Can you help?

    When forward biased then a zener diode is an ordinary diode that has a voltage of about 0.7V. It breaks down at its rated voltage when it is reverse biased. Maybe your tester does not have enough voltage to test its zener voltage.
  10. Audioguru

    Parallel LEDs - resistor needed?

    An LED is a semiconductor, not an incandescent light bulb. Light bulbs are easily made all exactly the same but LEDs have a range of forward voltage because some will be 2.8V, some will be 3.8V and many will be 3.3V. If you connect a 2.8V LED parallel to a 3.8V LED then the 2.8V one will hog all...
  11. Audioguru

    Amps measurement of a battery

    Maybe he wants to measure "Cold Cranking Amps"? But it probably does not get cold in India and probably their car batteries are small.
  12. Audioguru

    Boost Car Radio Signal

    A half decent car radio is very sensitive. A car antenna is also very sensitive. Your problem is the radio, antenna or cable between them is faulty or you are too far away from civilization.
  13. Audioguru

    xl6009 step up with TDA7492P amplifier problem.

    Maybe you do not understand about why an amplifier makes clipping. It occurs when you increase the input level higher than the level where the output swing is maximum. Then the tops and bottoms of the waveform are clipped off. If the supply voltage to the amplifier is increased then its output...
  14. Audioguru

    xl6009 step up with TDA7492P amplifier problem.

    Your batteries have "protection" circuits on them which limits their maximum output power and might cause clipping from the amplifier. The datasheet for the TDA7492 amplifier IC shows a graphs with various speaker impedances. With a 4 ohm speaker it shows about 18W with 1% clipping distortion...
  15. Audioguru

    xl6009 step up with TDA7492P amplifier problem.

    The TDA7492 amplifier produces only about 12W per channel into 4 ohm speakers with a 12V supply. Maybe you want much more power and turned up the volume too high and caused severe clipping. With a 20V supply the power would be about 32W per channel. The 18650 batteries are Lithium and are 4.20V...
  16. Audioguru

    Looking for advice for an LED flag project

    Batch? Are you buying from the LED manufacturer? The distributor might have a couple of years of batches all mixed up into one drawer.
  17. Audioguru

    Automatic Switcher between 12 volt and AC supply

    Sorry, we speak English here. "Light goes?" Do you mean when it gets dark outside at night? Then the battery powers the LEDs? "Light comes?" Do you mean when it gets light outside in the daytime? Then the power supply powers the LEDs? Then you obviously need a light detector driving a switching...
  18. Audioguru

    Need to reduce 5V 500ma to 3V 30ma

    Energizer AAA alkaline batteries can supply 30mA for 25 to 30 hours. Cheap Chinese "Super Heavy Duty" AAA batteries will drop dead in 2-3 hours.
  19. Audioguru

    xl6009 step up with TDA7492P amplifier problem.

    We cannot help you because you forgot to say how much output current and voltage is needed from the boost converter that might be overloaded. Speakers impedance? How many amplifiers/speakers? How much total output power is needed without clipping? Assuming two TDA7492 ICs driving two 8 ohm...
  20. Audioguru

    Looking for advice for an LED flag project

    You did not calculate how much voltage is needed if the blue and white LEDs voltage is the 3.8V maximum. Then the LEDs need 8 x 3.8V= 30.4V plus maybe 3 or 4V for the resistor. You must calculate both minimum and maximum or buy thousands of LEDs and test them all and hope you get some the same.
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