12/10/2023 0 Comments Piezo pickups for upright![]() ![]() ![]() a 25V part is perfectly fine.ĥ) This particular preamp (an FET source follower) can handle quite a big signal without distorting, so it shouldn't be bothered by the fact that your pickup is "hot". ![]() Doesn't matter if it's considerably more than 9V, i.e. It needs to be rated for well over 9 volts. The original value of 4.7uF is a bit stingy, and a 47uF cap is still very cheap. (But be kind to your amp and speakers - plug in everything, keep the amp off, power up the preamp, wait a few seconds, then turn on the amp.)Ĥ) I increased the preamps power supply filter cap to 47uF. This will reduce thumps and bangs if you plug your preamp into the input of an amplifier that's already turned on. If you still have enough signal level with the added cap, you don't need to build a preamp at all!ģ) If adding a 4.7 nF cap kills signal too much, and you do build the preamp, it's important to add an additional resistor from output to ground (R4 in the schematic attached to this post). Lacking this, I can't tell you exactly how much the output will be reduced by adding the 100pF cap.Ģ) Since your pickup is already "hot", try connecting a 4.7 nF (same as 4700 pF) capacitor between pickup output and ground it will reduce the output signal, but it will also make the pickup compatible with a 1-megohm amplifier input impedance. Unfortunately, the manufacturer of your Copperhead does not seem to provide the one specification we need: the actual capacitance of the pickup. So it largely depends on the features you want or need, and the format that you will find convenient.Here's a cleaned up circuit, stripped of the stuff you don't need.ġ) If you add a 100pF cap across the input, it will reduce the output voltage from your piezo pickup. So, which one do you choose? We've got lots of them, from tiny belt-clippable units to large table-top models - and from stripped down simple units to ones which have more "bells and whistles" than a firetruck. you need a good DI interface to send a feed to the soundman.you want to blend multiple pickups, or a pickup and mic, etc.your pickup's output is very low, so you need a preamp to increase its signal level to better match your amplifier.The 0.5'' hole is then threaded using a 9/16' 12 tap. Next drill a 0.125'' hole right through the piece so the wire can extend out the back. The hole does not go all the way through the piece. This is the hole for a threaded end pin jack. you want/need a convenient volume control (and tone controls?) close to you, for when your amplifier is not at your feet Drill a blind 0.5'' deep, centered in one end of the wood.there are features available from the preamp that are not on your amp, that can enhance or help with problems.the input impedance specification of your amplifier is under 1 megohm.But here's the shorthand - some common reasons you might consider using a preamp: If you already have an amp, a Preamp Can Often Make "Good" Sound "Great!"Ĭould adding a preamplifier to your pickup and amp provide an improvement to your sound and/or setup? If you've got a couple of minutes, check out our detailed FAQ on the subject. So if you have questions, email or call us and we'll give you the answers. We're a stocking dealer, and we know our product well. Regardless of your need, we will gladly help you navigate through the hype, so you can choose the amp that works best for your situation.įrom a relatively inexpensive, simple combo - to high-end, boutique amps and speakers with truly transparent sound and ultra-compact footprints - we're sure to have something that will fit your needs (and your budget.) And our product descriptions are our own we own and use several of these amps ourselves, and we've put all of them through their paces. And if you double - meaning that you play gigs on both upright and electric bass - we have amps that work well for that too. (Duh.) We have carefully chosen a selection of quality amplifiers that all work well with upright basses and their pickups. So, it stands to reason: if you are going to amplify your bass, you're going to need an amplifier. ![]()
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