Acoustic Guitar Pickup circuit using TL071

If you are looking for an Acoustic-guitar-pickup circuit that cheap and you can build with yourself.

Suitable for the show enjoyment of the party at home or in a group of friends.

This project is a good answer. For people like to play surely acoustic guitar with no pickup in it.

Known piezo speaker

The piezo speaker mostly is used as the driver for the audio signals. Such as in a digital watch or a warning voice types.

As the structure of the piezo is crystal with special properties that can generate a voltage from the pressure of crystallization.

We can use it instead of the general microphone by By which it can respond to vibrations and high sensitivity.

When considering the structure of the acoustic guitar. Guitar body is wood and is designed to be hollow.

When players strum guitar strings which is designed to the size and tension of the lines are different. by patterns of the sound of music.

In science, When an object vibrates at any frequency. Would become a sound wave. That sound wave will travel through the structure of the wood body guitar.

When we put the piezo speaker set up on the structure of guitar body is made of piezo crystals have better string vibration of the guitar itself.

The piezo will generate a small voltage to which we can put to use in the future.

Recommended: Electric guitar FM transmitter circuit from Acoustic

The working of the circuit

As shown Figure 1 We start from the strum the guitar. Guitar string vibrates, causing sound to come out.

Body vibration on the acoustic guitar could be passed to the piezo. Resulting electrical signal out.

The electrical signals that are sent through the C1-capacitor into pin 3 of IC1.

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Which the op-amp IC serves to amplify the small signal to large increase by rate with a gain that is determined by the ratio between R5-resistor and R3-resistor.

Acoustic guitar pickup circuit using TL071

Figure 1

The gain of the circuit is 3.2 times. Then the signal through the expansion to a large.

Then be passed to the C4-capacitor, and through a potentiometer to adjust the volume before sending it to J1. Which is a jack for connecting the input signal to the amplifier is available.

Process of building

Because this project, have fewer parts. If you do not want to build a typical PCB. You can use as a Universal PCB Board.

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By soldering and placement itself. Which can build in a short time. But need to check the wiring carefully.

PCB layout of acoustic guitar pickup circuit

Figure 2

But if you like tidiness so can build the copper-based model in Figure 2 as easy.

When done, it should check deficiency and short-circuit by copper. Inspection at all times. Will help prevent problems.

This does not work for this project.

The next step is to assemble various electronic components on the PCB, as in Figure 3.

Then, the wiring between the PCB and other devices such as The switch, volume, battery terminals, and output jacks.

Component wiring layout of acoustic guitar pickup circuit

Figure 3

List of the parts

The resistor, 0.25W +-1%
R1, R2: 2.2M
R3: 100K
R4: 1K
R5: 220K
VR1: 10K (B) Potentiometer

The capacitors
C1: 0.1uF 63V Polyester Capacitor
C2, C3: 10uF 50V Electrolytic Capacitors

The semiconductor
IC1: TL071

LED1: LED size 5 mm

Other parts
B1: Battery 9V within Pole
PZ1: Piezo speaker
S1: Switch ON/OFF
J1: Mono jack socket size 6.3mm

Testing and implementation.

A very easy to use, just put the piezo plate attached to the guitar body. and the output has to enter into the guitar amplifier circuit. or other amplifiers that we use.

Adjustment of the volume to the minimum position before. Turn ON switch the power supply to this project will see LED1 glow light.
Then accelerated volume modest position.

Then the guitar’s sound output to the power amplifier is active or not?

When it came out, then adjust the volume to suit the actual use next.

For this project. Shown to have fun with friends. Various festive party. But it is not suitable for Showing or recording professional high quality.

Here are a few related circuits you may find helpful, too:

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Ronald Sta. Maria

Can you modify this with a standard equalizer or tone adjuster

Hi,Ronald Sta. Maria
Thanks for your feedback.
Yes, you can use.

Minh IT

you have equalizer and tone from ad? please send for me! Thanks!


Hello. Can I use mono jack size 3.5mm? Thank you a lot.


Hey!!! C1 : 0.1 uF 63v
C2,3 : 10uF 50v
C4???? I don’t know!!!

steve abbott

10Uf 50V

Kev Conlon

Looks just the job for me!!
Any tips on adding EQ…..Bass, Middle Treble controls please???



if am using a bigger speaker, will i still use the same component values?


I made it and it’s working! But only when I plug earphones.. When I plug speakers with built in amp it doesn’t work.. It work but I can’t hear anything. Can you help me with this?

Minh IT

me too, connect with amplyfier it not work… sound noise and low….

Minh IT

i’ve just buid this one. I ok when connect PC, and laptop. But when i connect that with amplifier not working. The sound verry noise, and low. What problem when i connect with amplifier? Please help me!

Minh IT

what’s problem? why delete my comment AD?

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