Search results

Search Forums New Posts
  1. Audioguru

    Buzzing sound in speakers

    When you extended the original shielded audio cables with your ordinary wires, you should have asked yourself, "Why did they use shielded cables instead of ordinary wires?". Twisted wires are used for telephone lines that are completely balanced (signals are on both wires and a wire is not...
  2. Audioguru

    Buzzing sound in speakers

    There is an "other side of the world" problem. He buys a Salcon amplifier in a market in India but we buy it from a local audio store where they also have shielded audio cables. He has never seen a shielded audio cable or other things that are common here.
  3. Audioguru

    Buzzing sound in speakers

    Shielded audio cables are purchased, not made. Almost every audio equipment store sells them and almost all audio equipment comes with them. You can buy an entire roll of shielded audio cable to make the lengths you need. The input cable between your phone and the amplifier's input must be a...
  4. Audioguru

    Buzzing sound in speakers

    Most of your "wires all over the place" are antennas that pickup the electricity 50Hz or 60Hz all around you. Shielded (some people call it screened) audio cable blocks interference. Shorter wires reduce interference.
  5. Audioguru

    Buzzing sound in speakers

    Your wires are a mess all over the place. If the wires are much shorter and if some are shielded audio cables then they will not pickup mains hum interference.
  6. Audioguru

    Does the TDA2030 need negative potential?

    With an LM386 amplifier driving an 8 ohm speaker and a 12V supply, the speaker peak-to-peak voltage swing is +3.25V to -3.25V.
  7. Audioguru

    Does the TDA2030 need negative potential?

    Take an LM386 little amplifier IC and power it from 12VDC and 0V. Its maximum output into an 8 ohm speaker is not 12V peak-to-peak, instead it has voltage losses that are shown on a graph in its datasheet as a typical maximum peak-to-peak of only about 6.5V, not 12V. Since the voltage swing is...
  8. Audioguru

    Does the TDA2030 need negative potential?

    Correct. I disagree. The amplification is between +Vcc and 0V. Also, many car amplifiers are single supply and are bridged for almost 4 times the output power of a single amplifier. Since each speaker wire is driven and each is at half the supply voltage then an output coupling capacitor is...
  9. Audioguru

    Does the TDA2030 need negative potential?

    Maybe Rahulb cannot read the datasheet because it is also not available anymore. The datasheet tells him that his supply voltage is too low.
  10. Audioguru

    Does the TDA2030 need negative potential?

    The problem with obsolete TDA2030 amplifier ICs is that they are not used anymore and are not made anymore.
  11. Audioguru

    Does the TDA2030 need negative potential?

    On another website today a Bluetooth speaker is using a TDA7492 modern class-D bridged stereo amplifier IC. It produces 25W per channel with low distortion into 8 ohm speakers when its supply is 25V. But it is in a surface-mount 36 pins case. Most Chinese companies sell it already assembled.
  12. Audioguru

    Does the TDA2030 need negative potential?

    I told you that if you power the TDA2030 from the rectified 16V that feeds the 12V regulator then the output power will be 2.1W. 5W is only a little louder than 2W. The datasheet shows 5W into 8 ohms at low distortion when the supply is 22V and is 6W when the supply is 24V. Why not use a supply...
  13. Audioguru

    Does the TDA2030 need negative potential?

    The datasheet for the old obsolete TDA2030 says its minimum supply is 12V when it barely works. Its spec's are with a 28V supply. Your rectified 12V-0-12V produces +16V which can power the TDA2030 IC then its max output power is shown on a graph as 2.1W into an 8 ohm speaker.
  14. Audioguru

    M.O.S.F.E.T. diode clamp

    Gary in this forum or on another forum is using an N-channel Mosfet to drive a car ignition coil to electrify a fence to keep (kill?) farm animals from running away. Most circuits in Google show an added diode to prevent the drain of the Mosfet from going negative and nothing to prevent the...
  15. Audioguru

    Maximum Voltage in passive capacitive circuit

    A voltage multiplier circuit is passive and boosts the voltage. The diodes are passive.
  16. Audioguru

    question: car amplifier at home (diy)

    Xfire company does not list the dual 4 ohm woofer sold on ebay so maybe it is an old one or a fake. Ebay does not say the frequency response, instead they say "the effective range" without saying if it is plus and minus 30dB which is terrible or is 3dB which is pretty good. I wonder if they are...
  17. Audioguru

    question: car amplifier at home (diy)

    Parts Express 12" sub-woofers resonate at 24Hz to produce deep low frequencies. One has a max RMS power of 120W with a reasonable price and others have a 400W RMS rating and cost much more. They all have detailed T/S specs for an enclosure design. The very expensive high resonant frequency...
  18. Audioguru

    question: car amplifier at home (diy)

    The 44Hz resonant frequency of the 12" woofer will be increased when enclosed then it will not produce sub-woofer frequencies. The 750W RMS into 2 ohms (both 4 ohm voice coils in parallel) output power of the amplifier has no spec's about distortion so it might produce 350W of normal sound plus...
  19. Audioguru

    Bass Guitar Amplifier Build - help and guide.

    You have the Jfet before the 15k resistor but it should be after the resistor.
  20. Audioguru

    Charging AA Li-ion batteries

    Amazon sells Chinese AA size Li-Ion 1.5V battery cells that even have a 5V USB charging jack!
Top