Controlling volume of an amplifier..


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  1. #1
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    All good points Melanie, in some previous project i used those ALPS motorized pot.
    http://www3.alps.co.jp/WebObjects/ca.../RMP_RK271.PDF
    Steve

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    well yes and no, but yeah they're good for most case.

    VCA such as SSM2164 produce better results.. well for much sensitive ears...
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

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    Actually this got me thinking... about the earliest known occurance of Remote-Control of a Hi-Fi (or Lo-Fi)... - and I've managed 1957/58... That's FIFTY YEARS AGO!!!! All done with steam, mirrors and bits of string (wire!).

    http://www.radiopagajiba.latbs.lv/RRR/festival.htm

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    They're very good figures for thd (total harmonic distortion) Willing to bet that PCB layout would play a key role in obtaining them though.

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    choice of quality components as well... really hard to please a real HI-FI customer ears...myself include.
    Steve

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    Hi all,
    I appreciate your responce and I thank you for the ideas you shared... Its enough for me to start to do researching.

    Thanks again,
    joe

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    Throw a few things together on a piece of vero board, couple of lines of code in a 16f628 (my favorite pic), hookup a source input and give your ears a whirl. Worst that can happen is it doesn't work as good expected, dust yourself off and try again

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    Quote Originally Posted by mister_e View Post
    well yes and no, but yeah they're good for most case.

    VCA such as SSM2164 produce better results.. well for much sensitive ears...
    Hmm, it has higher THD and is controlled by analog voltage. So a DAC is really needed. More noise source and more difficult PCB. I can assure you Steve, it is a HI-FI device. I am high fidelist myself too.

    Quote Originally Posted by Melanie View Post
    Actually this got me thinking... about the earliest known occurance of Remote-Control of a Hi-Fi (or Lo-Fi)... - and I've managed 1957/58... That's FIFTY YEARS AGO!!!! All done with steam, mirrors and bits of string (wire!).

    http://www.radiopagajiba.latbs.lv/RRR/festival.htm
    Very nice indeed! This is what can be called art!

    Quote Originally Posted by T.Jackson View Post
    They're very good figures for thd (total harmonic distortion) Willing to bet that PCB layout would play a key role in obtaining them though.
    Yes, but I suppose that is a dominant rule in almost all electronics designs though. Good ground, capacitors on power lines, and seperatew analog and digital voltage sources to name a few. The vero board I can guess will not give optimum results in this case. It is not a LED test circuit...

    Ioannis

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