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  1. Audioguru

    Vacuum Tubes (Valves)

    Most solid state amplifiers produce extremely low distortion. But when the output level is too high for the supply voltage (clipping) then squarewaves with many odd-numbered harmonics are produced. Vacuum tubes can also produce clipping with squarewaves and odd-numbered harmonics but since their...
  2. Audioguru

    Bose Wave 1 - AWRC-1G - Treble & Bass Adjustments - Too Much Bass

    I have never purchased a little Bose stereo radio/CD player because of its poor frequency response.
  3. Audioguru

    Bose Wave 1 - AWRC-1G - Treble & Bass Adjustments - Too Much Bass

    Maybe Bose feeds the speaker with a series impedance causing it to resonate and sound "boomy". Maybe their little speakers have a peak at a mid-high frequency so they reduce the treble which makes the bass resonance too loud.
  4. Audioguru

    Bose Wave 1 - AWRC-1G - Treble & Bass Adjustments - Too Much Bass

    The small speakers in the long "waveguide" enclosure make a resonant "one-note-bass" that some people like to hear. I like to feel and hear all the low bass notes.
  5. Audioguru

    Vacuum Tubes (Valves)

    Vacuum tubes produce even-harmonics distortion that some old people like to hear like they heard many years ago. Even-harmonics are musical and are not harsh clipping distortion like an over-driven semiconductor amplifier.
  6. Audioguru

    Help adding audio out to a TV

    Small speakers are probably fed through small coupling capacitors that also do do not produce low frequencies. In a cheap clock radio, I needed to increase the capacitances of 3 coupling capacitors for it to produce excellent wideband sounds to an external much larger two-way speaker.
  7. Audioguru

    Looking for suggested dynamic microphone power level

    I was sent an email today that there was a reply to this old thread. But there is no recent reply that might have been erased.
  8. Audioguru

    Help with work to finish my college. Help me please!

    Today i received an email from Maker.Pro about making audio projects. They seem to be from students in India. The first one was a class-D audio amplifier with no audio specs. The second was an LM386 audio amplifier IC with errors. Both have videos showing a speaker missing an enclosure.
  9. Audioguru

    Help with work to finish my college. Help me please!

    All posts I see here on Maker Pro have two dates:
  10. Audioguru

    Help with work to finish my college. Help me please!

    There are two dates on each post that do not say what the dates are for.
  11. Audioguru

    Help with work to finish my college. Help me please!

    Why is this defective circuit from a student in India talked about AGAIN 8 years later? This new copy of the original clear schematic is covered with a grid and has Multisim(?) jigs and jabs on many wires. It has additional errors like R3 is shorted and the base-emitter of Q7 is shorted.
  12. Audioguru

    Looking for suggested dynamic microphone power level

    Some cheap recorder systems are designed to record a voice. They cut frequencies above 3kHz like a 100 years old telephone did. Then most of the talking was, "What? What did you say?" over and over.
  13. Audioguru

    Looking for suggested dynamic microphone power level

    I do not like the severe distortion produced by an electric guitar and its distortion pedals. The speakers used are far from hifi that I like. An acoustic guitar recording that sounds the same as a live player is what I like to hear.
  14. Audioguru

    Looking for suggested dynamic microphone power level

    Your recording is missing high audio frequencies like an AM radio. Mayve the problem is caused by the very cheap mic or the "guitar speaker" or the bandwidth limited "voice" recorder app that produce no high audio frequencies.
  15. Audioguru

    Looking for suggested dynamic microphone power level

    You mentioned buying a cheapo electret mic on Amazon. It is modern and will probably work well. Wkipedia says the 56 years old Shure SM58 dynamic mic is expensive so millions of poorly sounding fakes are sold (I think probably on ebay, AliExpress and Amazon).
  16. Audioguru

    Looking for suggested dynamic microphone power level

    The datasheet of an inexpensive electret mic shows how to power the Jfet inside it and shows that its output level drops if it is powered from a DC voltage that is too low. I use this circuit that has a power supply filter:
  17. Audioguru

    Looking for suggested dynamic microphone power level

    I assume that your headset mic is an electret type and your ohm-meter is causing its Jfet to conduct a little showing 800 ohms. 1) Its 2 wires need the correct polarity: positive on the signal wire and 0V on its shield wire. 2) Its output level is too low (about 10mV) to feed a power amplifier...
  18. Audioguru

    Looking for suggested dynamic microphone power level

    An "electret mic" is a condenser mic with 48VDC permanently stored in some electret material. The condenser has an extremely high impedance so the mic has a Jfet as an impedance reducer and needs 500uA max (maybe actually 350uA to 400uA) to power the Jfet through its load resistor (maybe 4.7k)...
  19. Audioguru

    Tuning TV sound bar

    Most old people like me use hearing aids. I even got the lenses in my eyes replaced (caused by cataracts) and the arteries in my heart opened with stents (caused by a heart attack).
  20. Audioguru

    Old module does not work

    The '89 Sunbird turbo had an automatic transmission that worked fine and was reliable.
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