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  1. Audioguru

    Speaker/s project - for amplifier.

    Here is the frequency response curve of a cheap 8" PA speaker. It has bass that resonates at about 150Hz. Its midrange is faint. Its upper mids are too loud (cone breakup) and shriek. Its highs are poor. It will probably cause acoustical feedback at 2kHz to 5kHz but if the treble tone control...
  2. Audioguru

    Adding pre out on soundbar for sub.

    The signals inside the soundbar amplifier probably have no deep low frequencies. You must add a low frequencies mixing amplifier at the soundbar inputs to mix together the stereo into mono and have a suitable lowpass filter to feed the sub amplifier. Does the TV or other signal source produce...
  3. Audioguru

    Speaker/s project - for amplifier.

    You cannot have all sound coming from one point because a woofer cannot tweet and a tweeter cannot woof. If you use a two-way speaker with the tweeter mounted in the woofer cone or with an additional whizzer cone then phase shifts will cause acoustical feedback problems. Reflections of sound...
  4. Audioguru

    Question about new schematic- Metronome

    Why is fake junk made in China and why does Amazon sell it? The designer of the Metronome did not even try it. Since the capacitor charges by the 1k resistor quickly but it discharges through the pot slowly, then the sound is click-click pause, click-click pause, click-click pause over and...
  5. Audioguru

    Series or Parallel?

    Here is how quickly a Name-Brand 9V alkaline battery will last:
  6. Audioguru

    Series or Parallel?

    Don't you have a speaker at your feet so you can hear what you are playing? Its speaker connection can drive an LED VU meter. Kits for the VU meter are available.
  7. Audioguru

    MOSFET not giving sufficient power

    The graphs on most datasheets show only a device with "typical" specs. Where on earth can you buy one that has typical or better specs? The Mosfet manufacturer might have sold all the very sensitive ones to a product manufacturer who paid more for them.
  8. Audioguru

    Series or Parallel?

    A ring of LEDs that all blink on and off will be ho hum boring. Why not have them in a circuit that has a microphone that hears the guitar and makes the LEDs be bright during each strum. I would make the ring of LEDs be driven by a circuit that lights them in sequence for each strum like a VU...
  9. Audioguru

    Question about new schematic- Metronome

    In your circuit, a 555 should not draw a current higher than about 25mA but your power supply shows 81mA. Is the power supply bad? Does it show 0mA without a load? Does it show 9mA when set to 9V and has a 1k load? Maybe the 22uF capacitor to ground at pin 2 and pin 6 is 0uF, try another one. I...
  10. Audioguru

    Question about new schematic- Metronome

    The schematic of the metronome schematic is very simple and is shown on many websites. Maybe the 555 is a fake or defective one from China (ebay, AliExpress, Banggood or Amazon)? Didn't you have an opamp from there that had the wrong part number on it? The 22uF capacitor at pin 2 and pin 6 of...
  11. Audioguru

    Propeller audio interface for audio quality?

    The Propellerhead Balance is an audio product with the detailed audio specs of size and weight. Not a word about frequency response within +/-2dB or distortion or noise level. The "guitar" input does not say the important input resistance.
  12. Audioguru

    Question about new schematic- Metronome

    Breadboards are a rats nest of wires all over the place. How can anybody see what connects to what? Your power supply shows that something in the circuit (the 555 IC?) is heating with 0.73W which is almost smoking.
  13. Audioguru

    Speaker/s project - for amplifier.

    A tubes amplifier has an output transformer that matches the high impedance output of the tubes to the total speaker impedance. Then an 8 ohm speaker on the 8 ohm 100W output gets the full power of 100W but two 16 ohm speakers in parallel each get 50W as you say. The transformer produces poor...
  14. Audioguru

    Speaker/s project - for amplifier.

    16 ohm speakers were used 60 years ago with vacuum tube amplifiers. A modern transistors amplifier makes only half the power into 16 ohms as it makes into 8 ohms and makes double the power into 4 ohms as it makes into 8 ohms. Two 16 ohm speakers in parallel make 8 ohms. You do not need the...
  15. Audioguru

    Speaker/s project - for amplifier.

    Electric guitars make their own unique sound with electronics that produces severe distortion like a buzzer but the speaker cuts the high frequencies and some midrange frequencies but boosts the upper midrange frequencies and also cuts the bass frequencies. I do not know if your speaker sounded...
  16. Audioguru

    Speaker/s project - for amplifier.

    Your 10" speaker is a woofer that probably does not produce mid and high audio frequencies that are produced by the tweeter. 1) Use the original tweeter. 2) Use another tweeter. 3) Try an audio equalizer circuit feeding the amplifier.
  17. Audioguru

    Speaker/s project - for amplifier.

    If you disconnect the tweeter then the inductor in series with the woofer will cut high audio frequencies. If you replace the inductor with a piece of wire then the woofer still might not play enough high frequencies.
  18. Audioguru

    Speaker/s project - for amplifier.

    The circuit board has an inductor in series with the woofer to keep high frequencies away from it and has a capacitor in series with the tweeter to keep low frequencies away from it. The tweeter looks like a piezo or a mid-frequency horn.
  19. Audioguru

    How do I connect the pull-up resistor to pin 7 of the LM555 timer?

    The circuit you showed has a potentiometer (a variable resistor) connected to pin 7. If it is adjusted to a low resistance then of course the pulse width is narrow.
  20. Audioguru

    Can this be repaired by a complete novice please? Basic circuit repair?

    Look here:
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