Mini MosFet

Power Amplifier Circuit diagram:

Power Amplifier Parts:

R1_______________2K2 1/4W Resistor
R2______________27K  1/4W Resistor
R3,R4____________2K2 1/2W Trimmers Cermet or Carbon (or 2K)
R5_____________100R  1/4W Resistor
R6_______________1K  1/4W Resistor
R7,R8__________330R  1/4W Resistors

C1______________22µF  25V Electrolytic Capacitor
C2______________47pF  63V Polystyrene or Ceramic Capacitor
C3,C4__________100µF  50V Electrolytic Capacitors
C5____________2200µF  50V Electrolytic Capacitor

Q1____________BC550C  45V 100mA Low noise High gain NPN Transistor
Q2___________IRF530  100V 14A N-Channel Hexfet Transistor (or MTP12N10)
Q3__________IRF9530  100V 12A P-Channel Hexfet Transistor (or MTP12P10)

Preamp Circuit diagram:

Preamp Parts:

P1______________50K Log.
Potentiometer (or 47K) (twin concentric-spindle dual gang for stereo)
P2,P3__________100K Linear Potentiometers (twin concentric-spindle dual gang for stereo) R1_____________220K 1/4W
Resistor R2_____________100K 1/4W
Resistor R3_______________2K7 1/4W
Resistor R4,R5____________8K2 1/4W
Resistors R6_______________4K7 1/4W
Resistor R7,R8,R13________2K2 1/4W
Resistors R9_______________2M2 1/4W
Resistor R10,R11_________47K 1/4W
Resistor R12_____________33K 1/4W
Resistor R14____________470R 1/4W
Resistor R15_____________10K 1/4W
Resistor R16______________3K3 1/4W
C1,C2,C9_______470nF 63V Polyester Capacitors
C3,C4___________47nF 63V Polyester Capacitors
C5,C6____________6n8 63V Polyester Capacitors
C7______________10µF 63V Electrolytic Capacitor
C8,C10__________22µF 25V Electrolytic Capacitors
C11____________470µF 25V Electrolytic Capacitor
Q1,Q3_________BC550C 45V 100mA Low noise High gain NPN Transistors Q2___________2N3819 General-purpose N-Channel FET

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Regulated Power Supply Circuit diagram:

Regulated Power Supply Parts:

R1_______________3R9 1 or 2W Resistor
R2______________22R  1/4W Resistor
R3_______________6K8 1/4W Resistor
R4_____________220R  1/4W Resistor
R5_______________4K7 1/2W Resistor

C1____________3300µF  50V Electrolytic Capacitor (or 4700µF 50V)
C2,C5__________100nF  63V Polyester Capacitors
C3______________10µF  63V Electrolytic Capacitor
C4_____________220µF  50V Electrolytic Capacitor

D1_____Diode bridge  100V 4A
D2___________1N4002  200V 1A Diode
D3______________LED  Any type and color

IC1___________LM317T 3-Terminal Adjustable Regulator

Q1____________TIP42A  60V 6A PNP Transistor

SW2_____________SPST  Mains switch

T1_____________230V Primary, 35-36V (Center-tapped) Secondary,
                  50-75VA Mains transformer (See Notes)

PL1____________Male Mains plug with cord