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Type: Posts; User: Audioguru

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  1. Replies
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    Closed: Re: tda7052a audio amplifier

    The TDA7052A is obsolete and is not made anymore. Its datasheet shows that it is always muted when pin 4 is grounded like in your schematic.
  2. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    Audiofools are not audiophiles.
  3. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    Same questions on this website.
    Audiofools used a capacitor bypassing each rectifier 50 years ago. Speaker baskets do not collect static. Audiophiles do not believe in these Snake Oil things.
  4. Closed: Re: Will this ceramic capacitor be damaged by overvoltage spikes?

    I think some manufacturers print reliable ratings and other manufacturers concentrate on making low cost junk.
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    Closed: Re: inverter Vhigh reduced

    Which IC are you using that still works when its power supply is only 0.9V to 1.2V??
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    Closed: Re: 0.5w audio amplifier

    A transistor can pass a signal when the transistor is turned off or the transistor can clamp it to ground and mute it. Use one of these for each signal. Also bias the emitter of the transistor and...
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    Closed: Re: 0.5w audio amplifier

    Your teacher wants you to use an antique uA741 opamp. 52 years ago the uA741 opamp was designed to use a 30V supply and will not work with only 5V.
    The TDA7052A is obsolete and has not been made for...
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    Closed: Re: buzzer and timer construction

    ****-a-doodle-doo, clang, clang.
    Do you want me to sing it for you to record it?
  9. [SOLVED]Closed: Re: Rookie making an audio step-up transformer

    There are many good quality electret microphones stocked at Digikey. The first one listed costs $.77US and its datasheet shows its fairly wide frequency response and its low noise level. It does not...
  10. [SOLVED]Closed: Re: Rookie making an audio step-up transformer

    A loudspeaker makes a poor microphone because of its strong low frequency resonance. It also does not need a transformer. The cheap old poor-sounding intercom at a gas station uses its speaker as its...
  11. Closed: Re: Zener diode simulation problem using multisim 12.0

    I do not know what you are trying to do.
    1) You have a 5V Zener diode with no part number and no spec's. Nobody makes one but 5.1V is common so my calculations use 5.1V.
    2) You are simulating...
  12. Closed: Re: Zener diode simulation problem using multisim 12.0

    Your attachment cannot be seen because it is invalid.
  13. Closed: Re: Is a tantulum different from a microfarad tantulum cap?

    When an oriental capacitor is marked with "k" then it means its value is +/- 10% tolerance.
    A tantalum capacitor has polarity. If you connected it backwards then it might be damaged and not work...
  14. Closed: Re: humbucker preamp - j201 gain is 1:1, why ?

    The original schematic uses a 6.8k drain resistor and says you do not need much gain for an electric guitar and the gain is only +3dB which is 1.414 times. But you reduced the drain resistor to 4.7k...
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    Closed: Re: Lets take a look on a linear amplifier

    I was called "Audioguru" by a salesman at an audio engineering company I worked for, because a Guru is an expert and master. The salesman and I are not Indian.
    I was born a white Canadian and have...
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    Closed: Re: Lets take a look on a linear amplifier

    The Texas Instruments TPA3220 class-D amplifier IC datasheet shows an output bandwidth of 100kHz and an internal class-D switching frequency of 480kHz. The circuit shows output filters to remove the...
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    Closed: Re: Lets take a look on a linear amplifier

    Most class-D audio amplifiers have an analog input. Some have a digital input. They convert the input signal to PWM inside the amplifier.
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    Closed: Re: Lets take a look on a linear amplifier

    When the signal current is at a peak then it is probably much higher current than a little DC offset current. At 55Hz then the peaks occur at 110Hz.
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    Closed: Re: Driving 140x 3W LEDs

    The datasheets for all ICs show their range of values. The "1.25V" reference of the LM317 is from 1.20V to 1.30V. Then a resistor that is exactly 2.0 ohms produces 600mA to 650mA. Plus a small change...
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    Closed: Re: Portable headphone amp w. batteries

    I noticed that the driver and output transistors are not included in the overall negative feedback loop therefore distortion is produced at high levels into low impedance headphones.
    At anywhere...
  21. Closed: Re: Runtime of clock using alkaline D cells instead of AA batteries

    Some name-brand alkaline D cells have a little C cell inside with the C cell capacity. Few D cells are sold today.
    Some Chinese alkaline D cells have anything that is cheap inside.
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    Closed: Re: Lets take a look on a linear amplifier

    You are using an audio amplifier circuit in another kind of circuit that has output transformers. But audio amplifier circuits have not used output transformers for at least 55 years.
    If the core of...
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    Closed: Re: Lets take a look on a linear amplifier

    Low frequency and high frequency phase shifts caused by a transformer will occur if the transformer is inside the negative feedback loop (when the output of the transformer provides the negative...
  24. Closed: Re: In-ear speaker transducers for hearing aids...

    In the ear hearing aids do not produce the high amount of sound pressure that over-the-ear hearing aids provide, and have problems with sweat moisture affecting the battery and electronics.
    Due to...
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    Closed: Re: Lets take a look on a linear amplifier

    An amplifier does not "sequentially fire gates". Instead it simply amplifies the input signal's voltage and current.

    A linear amplifier has a lot of heating but a class-D high frequency switching...
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