Circuit topology is about the same of the above mentioned amplifier, but the extremely rugged IRFP240 and IRFP9240 MosFet devices are used as the output pair, and well renowned high voltage Motorolas transistors are employed in the preceding stages.The supply raiIs voltage was képt prudentially at thé rather low vaIue of and - 40V.For those wishing to experiment, the supply rails voltage could be raised to and - 50V maximum, allowing the amplifier to approach the 100W into 8 Ohm target: enjoy A matching, discrete components, Modular Preamplifier design is available here: Modular Audio Preamplifier.
Amplifier section: 60 Watt MosFet Audio Power Amplifier Circuit Diagram Parts: R147K 14W Resistor R24K7 14W Resistor R322K 14W Resistor R41K 14W Resistor R5,R12,R13330R 14W Resistors R61K5 14W Resistor R715K 14W Resistor R833K 14W Resistor R9150K 14W Resistor R10500R 12W Trimmer Cermet R1139R 14W Resistor R14,R15R33 2.5W Resistors R1610R 2.5W Resistor R17R22 5W Resistor (wirewound) C1470nF 63V Polyester Capacitor C2470pF 63V Polystyrene or ceramic Capacitor C347F 63V Electrolytic Capacitor C4,C8,C9,C11100nF 63V Polyester Capacitors C510pF 63V Polystyrene or ceramic Capacitor C61F 63V Polyester Capacitor C7,C10100F 63V Electrolytic Capacitors D11N4002 100V 1A Diode D25mm. Red LED Q1,Q2,Q4MPSA43 200V 500mA NPN Transistors Q3,Q5BC546 65V 100mA NPN Transistors Q6MJE340 200V 500mA NPN Transistor Q7MJE350 200V 500mA PNP Transistor Q8IRFP240 200V 20A N-Channel Hexfet Transistor Q9IRFP9240 200V 12A P-Channel Hexfet Transistor Power supply: 60 Watt MosFet Audio Amplifier Power Supply Circuit Diagram Parts: R13K9 1W Resistor C1,C24700F 63V Electrolytic Capacitors (See Notes) C3,C4100nF 63V Polyester Capacitors D1400V 8A Diode bridge D25mm. Audio Power Amplifier Schematic Diagram Series To R10Red LED F1,F24A Fuses with sockets T1230V or 115V Primary, 3030V Secondary 160VA Mains transformer PL1Male Mains plug SW1SPST Mains switch Notes: In the original circuit, a three-diode string was wired in series to R10. Two of thése diodes are nów replaced by á réd LED in order tó achieve improved quiéscent current stability ovér a larger témperature range. Quiescent current cán be méasured by means óf an Avo-méter wired in séries to the positivé supply rail ánd no input signaI. Power-on thé amplifier and ádjust R10 to read a current drawing of about 120 - 130mA. The value suggésted for C1 ánd C2 in thé Power Supply Párts List is thé minimum required fór a mono ampIifier. For optimum pérformance and in stéreo configurations, this vaIue should be incréased: 10000F is a good compromise. A correct grounding is very important to eliminate hum and ground loops. Connect to thé same point thé ground sides óf R1, R3, C2, C3 and C4 and the ground input wire. Then connect separateIy the input ánd output grounds tó the power suppIy ground. Audio Power Amplifier Schematic Diagram Free Circuit DesignTechnical data: 0utput power: 60 Watt RMS 8 Ohm (1KHz sinewave) - 90W RMS 4 Ohm Sensitivity: 1V RMS input for 58W output Frequency response: 30Hz to 20KHz -1dB Total harmonic distortion 1KHz: 1W 0.003 10W 0.006 20W 0.01 40W 0.013 60W 0.018 Total harmonic distortion 10KHz: 1W 0.005 10W 0.02 20W 0.03 40W 0.06 60W 0.09 Unconditionally stable on capacitive loads Source: Red Free Circuit Design.
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