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DIY For Audio
Wilson Audio Sophia 2 - What drivers are these?
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<blockquote data-quote="Hennie" data-source="post: 505330" data-attributes="member: 20"><p>The circuit would be similar to the amplifier in a piezo pickup for a guitar. A JFET or FET input op amp with 10M input impedance should work. Cable capacitance may be problematic, which is why a simple JFET amplifier stage is usually mounted on the pickup side. The Philips motional feedback drivers used this scheme.</p><p></p><p>A low impedance virtual earth op amp input could also be used. In this case, the gain setting element should be a capacitor, bypassed by a high value resistor to provide DC feedback.</p><p></p><p>What about a cheap guitar piezo pickup with built-in amplifier? A cheap piezo horn tweeter element, if lying around, could also be used.</p><p></p><p>Here's a guitar pickup made from a cheap buzzer, with suitable circuit. The tone control should of course be omitted:</p><p></p><p>http://www.joebrown.org.uk/wp/?p=1712</p></blockquote><p></p>
[QUOTE="Hennie, post: 505330, member: 20"] The circuit would be similar to the amplifier in a piezo pickup for a guitar. A JFET or FET input op amp with 10M input impedance should work. Cable capacitance may be problematic, which is why a simple JFET amplifier stage is usually mounted on the pickup side. The Philips motional feedback drivers used this scheme. A low impedance virtual earth op amp input could also be used. In this case, the gain setting element should be a capacitor, bypassed by a high value resistor to provide DC feedback. What about a cheap guitar piezo pickup with built-in amplifier? A cheap piezo horn tweeter element, if lying around, could also be used. Here's a guitar pickup made from a cheap buzzer, with suitable circuit. The tone control should of course be omitted: http://www.joebrown.org.uk/wp/?p=1712 [/QUOTE]
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DIY & Tutorials
DIY For Audio
Wilson Audio Sophia 2 - What drivers are these?
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