Sunday, January 16, 2011

Home » » 70 Watt Guitar Amplifier Using 2N30055/MJ2955 Transistor

70 Watt Guitar Amplifier Using 2N30055/MJ2955 Transistor

The Guitar power amplifier circuit of this design adopts the still new but already successful 45 Watt Class B Amplifier Simplicity and ease of construction of this amplifier, combined with the complete absence of manual settings make it ideal for Guitar or Bass amplifier.
70 Watt Guitar Amplifier Circuit

Preamplifier + Tone Control  For Guitar Amplifier Circui

The preamplifier features two almost identical three-transistor gain-blocks based on a complementary two-stage circuit with dynamic active load of the output transistor. A circuit topology early used in Revox tape recorders and audio preamplifiers with single rail supplies in the 18 - 24Vdc range.

In this preamp the gain blocks are powered by split supplies of ±24V with two advantages: a high output voltage of about 15V RMS allowing a very wide overload margin and the facility to easily derive the preamp power supply from the power amplifier main supply.

A three-band stacked-type tone control is implemented in the second stage but, unlike the more common passive controls, active controls are used here, allowing better signal to noise ratio and overload margin with no gain loss.

List Componet Of  Guitar Amplifier
R1             : 8K
R2 : 3K9
R3,R6 : 1K
R4 : 2K2
R5 : 15K
R7 : 22K
R8 : 330R
R9,R10 : 10R
R11,R12 : 47R
R13 : 10R

C1 : 1µF/63V
C2 : 470pF/63V
C3 : 47µF/25V
C4 : 15pF/63V
C5 : 220nF/100V
C6 : 100nF/63V
D1,D2,D3,D4 : 1N4148 150mA Diodes

Q1,Q2 : BC560C PNP Transistors
Q3 : Q4BC556 PNP Transistors
Q5 : BC546 NPN Transistor
Q6 : BD139 NPN Transistor
Q7 : BD140 PNP Transistor
Q8 : MJ2955 PNP Transistor
Q9 : 2N3055 NPN Transistor

List Componet Of  Preamplifier
P1             : 10K  Potentiometer
P2,P3,P4 : 47K Potentiometers
P5 : 10K Potentiometer

R1,R2 : 33K
R3 : 220K
R4 : 390R
R5,R14 : 3K9
R6,R15 : 8K2
R7,R16 : 12K
R8,R11,R17,R20 : 560R
R9,R18 : 5K6
R10,R19 : 100R
R12 : 3K3
R13 : 18K
C1,C12 : 220nF Polyester Capacitors
C2,C13 : 100pF Ceramic Capacitors
C3,C14 : 10pF Ceramic Capacitors
C4,C15 : 47µF/25V Electrolytic Capacitors
C5,C16 : 100µF/25V Electrolytic Capacitors
C6,C7 : 10µF/25V Electrolytic Capacitors
C8,C11 : 4n7 Polyester Capacitors
C9 : 10nF Polyester Capacitor
C10 : 47nF Polyester Capacitor

Q1 : BC560C PNP Transistor
Q2,Q3,Q5,Q6 : BC546 NPN Transistors
Q4 : BC557 PNP Transistor 
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