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Type: Posts; User: burai

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  1. Replies
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    Closed: Re: Ear headphone with low sound

    thanks you
    i decide to use one of pam8xxx
    and forget the circuit from post#1
    the main problem is the power source
    it toke me in new way by use
    mini Rechargeable battery »» Switching Power...
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    Closed: Re: Ear headphone with low sound

    i read PAM8403 data sheet
    Absolute Maximum Ratings : Supply Voltage =6v
    how about make voltage divider and stay at 5v?
    file Attached
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    right to ground ~= 0.7v
    left to...
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    Closed: Re: Ear headphone with low sound

    thanks mr BradtheRad
    it will be my next option
    if Switching Power supply not work

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    thanks every one

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    Closed: Re: Ear headphone with low sound

    thanks mr Audioguru
    i can do Switching Power supply unit that use XL6009
    and search for another op amp
    but do Switching noise here ignorable ?
    also dose coin cell suit for Switching ?
    so if ...
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    Closed: Re: Ear headphone with low sound

    thanks mr d123
    seriously you helped me
    i want very few component and lite circuit
    so i plan to use coin cell
    first
    a rail-to-rail
    if not
    i have to lower the output

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    Closed: Re: Ear headphone with low sound

    sorry you say: Maybe use class D amplifier with low pass filter.
    my project have 2 input so i guess you mean classic old class D amplifier one input one output
    not ic based on class D amplifier...
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    Closed: Re: Ear headphone with low sound

    thanks mr Klaus
    ok i will do google search for dedicated earphone ic and after read it data sheet i will post my effort
    about class D amplifier is it will be 2 unit ?
    one for right and second...
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    Closed: Re: Ear headphone with low sound

    thanks mr Brian
    ok i will use capacitors and load resistor
    i want to use LM158 but from it data sheet
    Input Voltage ( -0.3V to +32V )
    but my Input Voltage go to (-0.7)
    sorry im confuse about...
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    Closed: Ear headphone with low sound

    hi every one
    i want to amplifi audio signal from phone
    i have ear headphone with low sound
    to do that i want to use smd dual op amp
    1/2 for right the rest for left
    vin =0.7v , power in= 1mw...
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    Closed: Re: ic8038 can this work

    yes it's alot of power
    but i have to do it
    no i can't use household electricity for the application
    you know mr audioguru i assume you think all about dissipation as heat
    it because my plan is...
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    Closed: Re: ic8038 can this work

    ok mr Audioguru
    i need 220v ac . 50hz
    power 3000 w
    so
    i will start to make the circuit
    with pwm model
    using pic microcontroller
    and post the circuit here
    thanks for help
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    Closed: Re: ic8038 can this work

    thank mr fvm for reply
    if i design circuit like audio amplifier that amplifer 3 or 4 volts sine , 50 hz
    and feed them to transformers to be 220 ac 50 hz
    can it be
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    Closed: Re: ic8038 can this work

    first im here because before 2 week ago i see one of your
    reply for someone
    it help me
    and now i see all the magic here in this forum as good people

    now if sg3524 not work here
    as i...
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    Closed: Re: ic8038 can this work

    All what i think about
    is that generate 220 ac from 12 ac without ripple
    for that i think i can use sin wave source
    thank mr Audioguru
    now i understand thate connect 2 transistor in series with...
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    Closed: Re: ic8038 can this work

    thanks mr audioguru
    Excuse me im bad at english
    im think to use that sine wave signal
    also i know that the circuit most contain push pull stage
    now if i replace ic sg3524 with
    two ic8038
    can...
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    Closed: ic8038 can this work

    hi every one
    my first post in the forum
    hope welcome
    im plan to make inverter
    by using ic8038
    it generate sine wave signal
    can this circuit work
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