The goal of this project was to build a guitar amp along with a filter to single out a specific string of an electric guitar. The specific string this project focuses on is string G (196Hz). A Chebyshev filter is used to single out the G string while a simple op amp and other passive components are used for the amplifier.
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Step 1: Parts List
- 160 kOhm resistor x2
- 47 nF capacitor x10
- 5.6 MOhm resistor
- 6.2 MOhm resistor
- 2.2 MOhm resistor x2
- 1.8 MOhm resistor
- 43 Ohm resistor
- 47 Ohm resistor
- 110 Ohm resistor
- 120 Ohm resistor
- 150 Ohm resistor
- 238 kOhm resistor x2
- 910 kOhm resistor
- Operational Amplifier x5
- 22K 1/4W Resistor
- 10µF 25V Electrolytic Capacitor
- 100nF 63V Polyester or Ceramic Capacitor
- 220µF 25V Electrolytic Capacitor
- TDA7052 Audio power amplifier IC
- 6.3mm Stereo Jack sockets
- 8 Ohm Loudspeaker
- 9V PP3 Battery or 3V Battery
Step 2: Building the Amplifier
The amplifier involves following a simple schematic as seen from the picture. Only one jack is necessary, the other is optional. Pin 1 holds the connection between the battery and C2/C3. C1 and R1 should connect to pin 2 of the IC. Pins 3 and 6 should be connected to ground. Pins 5 and 8 are connected to the jack. From the jack, the speaker is connected.
Here is a video of the amplifier at work:
Step 3: Building the Filter
The filter design is a little more compleicated than the amplifier but still easy enough to construct on a breadboard. Here is a link to the OP 37 pin out chart: http://www.analog.com/media/en/technical-document...
Here is an example of a single op amp connection on a breadboard: https://circuits.io/circuits/4756866-filter
Above is also an example of the frequency you should expect if you measure the frequency response.
An ideal circuit was made using a free program, QUCS, a bode plot was created from that and is shown above.