![]() ![]() If you use a lower input resistance amplifier, you'll need to pad the output of the transducer with a capacitor to flatten the low frequency response which will cause a loss in amplitude response. Piezo pickup in combination with mini microphone. Fishman Matrix Infinity Mic Blend Guitar Pickup and Preamp System. Most orders are eligible for free shipping. Mini microphones (internal / body mounted) Piezo pickup. Enjoy the lowest prices and best selection of Piezo Guitar Pickups at Guitar Center. External microphones in front of the guitar. These are the options for amplifying an acoustic guitar. Plus, making a step down transformer with a 100:1 impedance ratio (10:1 voltage ratio) will attenuate the signal which will degrade the signal to noise ratio (not good).Ĭonclusion: Stick with the preamp approach and use a preamp with an input impedance above 6.4 M \$\Omega\$. Alternatives can be found in mini microphones attached in the body or around the sound hole like piezo pickups and magnetic pickups. The magnetizing inductance calls for a primary inductance over 20k Henrys (magnetizing inductive reactance needs to be a few times higher than the transducer impedance). Using a transformer at this high impedance is not practical. Assuming you want a low-cut frequency of 50 Hz, Rin would need to be 6.4 Megohms \$ (1/(2 \pi\ f\ C) = 1/(2\pi\ 50Hz\ 500pF)) \$. It’s also a great way to create a more acoustic-type sound to your electric guitar. Higher Rin will make the high-pass cutoff frequency lower and will also lower the input noise. The piezo pickup is built into the bridge of your guitar, and is a great way to add volume to your acoustic guitar. ![]() The amplifier input impedance will determine the low frequency response of the system and also equivalent input thermal noise. Simulate this circuit – Schematic created using CircuitLab I couldn't find electrical data on piezo guitar pickups, but one source said the simple capacitance of typical guitar piezo pickup is around 500pF to 800pF. ![]() Near resonance (one source said around 4.6 kHz), the impedance is complex and the amplitude response will peak. At low frequency, a piezo transducer can be modeled as a capacitor and a voltage source as shown in the schematic. ![]()
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