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Guitar Control(TL062 )

2015-03-01 09:29  
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This article briefly describes the Guitar Control (TL062). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, you can better grasp this principle. In this circuit, you can learn about and purchase these components: TL062.

Stand-alone, 9V battery powered unit, Three-level input selector, three-band tone control

This preamplifier was designed as a stand-alone portable unit, useful to control the signals generated by guitar pick-ups, particularly the contact “bug” types applied to acoustic instruments. Obviously it can be used with any type of instrument and pick-up. It features a -10dB, 0dB and 10dB pre-set input selector to adjust input sensitivity, in order to cope with almost any pick-up type and model. A very long battery life is ensured by the incredibly low current consumption of this circuit, i.e. less than 800μA.

Figure:1 Guitar Control Circuit Diagram

Figure 1 Guitar Control Circuit Diagram

Parts:

P1,P2________100K Linear Potentiometers
P3___________470K Linear Potentiometer
P4___________10K Log. Potentiometer
R1___________150K 1/4W Resistor
R2___________220K 1/4W Resistor
R3___________56K 1/4W Resistor
R4___________470K 1/4W Resistor
R5,R6,R7_____12K 1/4W Resistors
R8,R9________3K9 1/4W Resistors
R10,R11______1K8 1/4W Resistors
R12,R13______22K 1/4W Resistors
C1___________220nF 63V Polyester Capacitor
C2,C8________4μ7 63V Electrolytic Capacitors
C3___________47nF 63V Polyester Capacitor
C4,C6________4n7 63V Polyester Capacitors
C5___________22nF 63V Polyester Capacitor
C7,C9________100μF 25V Electrolytic Capacitors
IC1__________TL062 Low currentBIFETDual Op-Amp
J1,J2_________6.3mm. Mono Jack sockets
SW1_________1 pole 3 ways rotary or slider switch
SW2_________SPST Switch
B1___________9V PP3 Battery Clip for PP3 Battery

Circuit operation:

IC1A op-amp is wired as an inverting amplifier, having its gain set by a three ways switch inserting different value resistors in parallel to R4. This input stage is followed by an active three-band tone control stage having unity gain when controls are set in their center position and built around IC1B.

Technical data:

Frequency response:
20Hz to 20KHz -0.5dB, controls flat.

Tone control frequency range:
±15dB at 30Hz; ±19dB at 1KHz; ±16dB at 10KHz.

Maximum input voltage (controls flat):
900mVRMSat 10dB input gain; 7.5VRMSat -10dB input gain.

Maximum undistorted output voltage:
2.5VRMS.

Total Harmonic Distortion measured at 2VRMSoutput:
<0.012% at 1KHz; <0.03% at 10KHz.

THDat 1VRMSoutput:
less 0.01%

Total current drawing:
less 800μA.

 

 


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