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Thread: taming a Rod Piezo

  1. #36
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    plan #1 is leaving the Alumitone set up as is , piezo to a 10k pot both sent to a TRS stereo out jack , stereo Y cable out, send the piezo through a pre-amp(tech 21 is on the way) to one amp , Alumitone out to another amp . I have more than one build, so I'd still like to have an internal blend set up , haven't decided which way to go on that yet. JM if you are still contemplating on providing a sketch please do , this is not a push!! so please don't feel it is , would like to try a DIY/w help something.

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    Last edited by shortcircuit; 03-15-2019 at 08:15 PM.

  2. #37
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    Quote Originally Posted by shortcircuit View Post
    plan #1 is leaving the Alumitone set up as is , piezo to a 10k pot both sent to a TRS stereo out jack , stereo Y cable out, send the piezo through a pre-amp(tech 21 is on the way) to one amp , Alumitone out to another amp . I have more than one build, so I'd still like to have an internal blend set up , haven't decided which way to go on that yet. JM if you are still contemplating on providing a sketch please do , this is not a push!! so please don't feel it is , would like to try a DIY/w help something.
    It is no good idea to connect a 10k pot to the piezo. A piezo PU is a high impedance capacitive source, a typical capacitance value being 1.5nF. Connecting this to a 10k pot produces a high pass filter with a corner frequency of above 10kHz! This means that all frequencies below 10kHz will be strongly attenuated.

    The minimum load resistance should be 1M. But a 1 M pot will noticeably reduce highs at lower vol. settings.

    There is actually no good passive solution to your problem.

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    Last edited by Helmholtz; 03-16-2019 at 04:10 PM.
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  3. #38
    Old Timer J M Fahey's Avatar
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    Ok, here´s the very low consumption (0.2mA meaning 4000 playing hours from a typical 9V alkaline ) chopped to the bone Piezo/magnetic preamp.

    Fails safe, IF battery dies (which by itself will take Months or Years ) you simply turn Balance pot fully towards the Magnetic pickup and continue playing.

    Click image for larger version. 

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    Juan Manuel Fahey

  4. #39
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    Thank you JM , very nice design, I will start gathering components , will have to order a few , I'll give it a go and let you know.
    Thanks again really appreciate it.

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