Mini Guitar Amp

COMPONENTS

PCB
PCB              MINI GUITAR AMP PCB

Capacitor
C1    47n       47NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C2    47n       47NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C3    220u     220UF 25V ELECTROLYTIC CAPACITOR 8X12MM
C4    100n     100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C5    100u     100UF 35V ELECTROLYTIC CAPACITOR 6X11MM
C6    100n     100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR (Boost optional)

Diode       
D1    LED       LED 3MM GREEN  

Resistor
R1     1M        1M OHM 1/4W 1% METAL FILM RESISTOR
R2     3.9k      3.9k OHM 1/4W 1% METAL FILM RESISTOR
R3     10         10 OHM 1/4W 1% METAL FILM RESISTOR
R4     2.2k      2.2k OHM 1/4W 1% METAL FILM RESISTOR

IC
Q1    2N5457     SMD SOT-23 2N5457 JFET N-CHANNEL TRANSISTOR
IC1   LM386       LM386 AUDIO AMPLIFIER IC
(IC1 Socket    8 PIN DIP IC SOCKET ADAPTOR)

Potentiometer        
VOL           10k-B       10k OHM Lin POTENTIOMETER
GAIN         1k-B         1K OHM Lin POTENTIOMETER
 

PCB DH.B8v4

SCHEMATIC

BOOST MOD

Mount a 100nF capacitor on C6 and wire a switch to Sw.

C6    100n     100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
SW   SPDT    MINI TOGLE SWITCH ON-ON

GENERAL DESCRIPTION OF COMPONENTS

Resistors

Resistors don't have polarity, so you can place them in any direction. Determine their resistance value by using a multimeter or by reading the color bands.

Electrolytic capacitors

Electrolytic capacitors have their value and maximum voltage rating printed on the body. The negative pin is indicated by a white stripe along the can, and it also has a shorter leg. The longer leg is positive. Never exceed the maximum voltage rating. Ensure the capacitor's voltage rating is at least double that of your power supply (e.g., use an 18V capacitor for a 9V power supply).

Polyester capacitors

Polyester capacitors don't have polarity and can be placed in any direction. Their value is marked using a three-number code. The first two numbers represent the first and second digits of the value, and the third number is the multiplier code (read in picofarads, pF).

Integrated Circuits

Integrated Circuits (ICs) have their model number printed on them. A notch, a half-circle, or a small dot indicates the correct orientation on the PCB.

Diodes

Diodes have their model number printed on them. The polarity (cathode) is indicated by a stripe or ring near one end. This ring corresponds to the polarity marking on the PCB.

Led diodes

LEDs (Light Emitting Diodes) have polarity. The cathode is indicated by a flat edge on the side of the LED's plastic casing and a shorter leg. The longer leg is the anode. On the PCB, the cathode is marked with a flat side and the anode with a round side.

Transistors

Transistors are three-terminal components with their model number printed on them. To ensure correct orientation, one side of the transistor's body is flat while the other is curved.

Potentiometers

Potentiometers have their resistance value marked on them. They are also marked with a letter to indicate their taper: A for logarithmic, B for linear, and C for reverse logarithmic.