Mini Guitar Amp

This mini guitar amplifier is based on the Ruby Amp (runoffgroove.com). It can yield ½ Watt at 9V, being perfect as a home practice amp. It has gain and volume control, offering a very dynamic sound on any speaker.
Steps

Created by DHEA
Status: Active
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Mini Guitar Amp Step 1 of 5

Dhb8_photo

Effect type: amplifier

Pedal description

This mini guitar amplifier can yield ½ Watt at 9V, being perfect as a home practice amp. It has gain and volume control, offering a very dynamic sound on any speaker.

This amplifier is based on the circuit of the Ruby Amp (runoffgroove.com), a reference DIY project with a lot of documentation in multiple DIY forums. You can also modify the components and use the PCB to design your own amp circuit.

The PCB allows to install a led (with its resistor) and an interesting modification to add a gain switch. The potentiometers can be directly mounted on the PCB.

This project indicates the original components values, feel free to modify and find your own sound.

Controls

  • Volume: controls the overall output
  • Gain: controls the gain

Kit contents

Capacitors    
2x     47NF 0.047UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
1x     220UF 25V 105C RADIAL ELECTROLYTIC CAPACITOR 8X11MM
2x     100NF 0.1UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
1x     100UF 50V 105C RADIAL ELECTROLYTIC CAPACITOR 8X11MM
IC / Transistor    
1x     2N5457 JFET N-CHANNEL TRANSISTOR
1x     LM386 LM386N AUDIO AMPLIFIER IC
Diode    
1x     LED 3MM RED
Resistors    
1x     1M OHM 1/4W 1% METAL FILM RESISTOR
1x     10 OHM 1/4W 1% METAL FILM RESISTOR
1x     3.9K OHM 1/4W 1% METAL FILM RESISTOR
1x     2.2K OHM 1/4W 1% METAL FILM RESISTOR
Potentiometers    
1x     10K OHM LINEAR TAPER POTENTIOMETER
1x     1K OHM LINEAR TAPER POTENTIOMETER
Hardware    
1x     MINI GUITAR AMP DIY PCB GUITAR EFFECT
1x     3MM BEZEL LED HOLDER CHROME METAL
1x     9V 9-VOLT BATTERY CLIP / CONNECTOR SNAP
1x     DC POWER JACK 2.1MM ENCLOSED FRAME WITH SWITCH
1x     6.35MM 1/4" MONO CHASSIS SOCKET / JACK
1x     6.35MM 1/4" STEREO CHASSIS SOCKET / JACK 3 TERMINALS
2x     DAVIES 1510 CLONE BLACK KNOB
1x     8 PIN DIP IC SOCKET ADAPTOR SOLDER TYPE
2x     MINI TOGGLE SWITCH SPDT ON-ON
1x     AWG 22 BLACK HOOK-UP WIRE 1FT (30CM) STRANDED
1x     AWG 22 RED HOOK-UP WIRE 1FT (30CM) STRANDED
1x     AWG 22 WHITE HOOK-UP WIRE 1FT (30CM) STRANDED

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