Sunday, January 16, 2011
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.
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| 70 Watt Guitar Amplifier Circuit |
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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
Circuit From: http://www.redcircuits.com/
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