Mini Guitar Amp (1590B)

This mini guitar amplifier is ideal for home practice, capable of driving speakers and headphones. It features tone and volume controls, with adjustable internal gain.
Steps
  1. Overview
  2. Designators and components
  3. PCB assembly
  4. Drilling template
Categories
Tayda Electronics Kits, DIY Projects, DIY Guitar Effects
Created by DHEA
Status: Active
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Designators and components Step 2 of 4

COMPONENTS

PCB
PCB              

Capacitors
C1    47n       47NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C2    100n     100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C3    100n     100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C4    100n     100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C5    47n       47NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C6    220u     220UF 25V ELECTROLYTIC CAPACITOR 8X12MM
C7    100u     100UF 35V ELECTROLYTIC CAPACITOR 6X11MM
C8    100n     100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR

Diodes       
D1    1N4001  1N4001 DIODE 1A 50V
D2    LED        LED 3MM GREEN

Resistors
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     3.3k      3.3K OHM 1/4W 1% METAL FILM RESISTOR

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

Potentiometers        
VOL           10k-B       10K OHM LIN POTENTIOMETER
TONE         100k-B     100K OHM LIN POTENTIOMETER
GAIN          1k-B        1K OHM TRIMMER POTENTIOMETER

Connectors
DC                     DC POWER JACK 2.1MM BARREL-TYPE PCB MOUNT
INPUT                6.35MM 1/4" STEREO INSULATED SWITCHED SOCKET JACK PCB
OUTPUT             6.35MM 1/4" STEREO INSULATED SWITCHED SOCKET JACK PCB
BATTERY            9V 9-VOLT BATTERY CLIP / CONNECTOR SNAP

 

PCB

   

 

SCHEMATIC

 

HEADPHONES AMPLIFIER

The PCB is designed to drive speakers or headphones. 

  • For headphones: Install a jumper across the HEADPHONES pad to connect the headphones stereo jack.

  • For speakers: Leave the HEADPHONES pad empty to connect the speaker mono jack.

Warning: To avoid a short-circuit at the output, the jumper must be removed when using a mono speaker configuration.

 

GAIN ADJUSTEMENT

Set the amplifier with volume and tone potentiometers at maximum. Gradually increase the internal gain until you reach distortion. When using headphones, exercise caution and adjust the gain to maintain safe listening levels.

 

 

 

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