25 Watt power amplifier based MosFet, can be connected directly to the signal source and does not require pre-amplifier to drive. The amplitude of the input signal must reach the level of 200 mV. This signal is normally present on the linear output recorder, CD player, computer sound card and other devices. To adjust the volume can be placed at the entrance to the potentiometer 10 kohm. Trimmer adjustable quiescent current. It must be within 100 mA.
Technical data:
Output power : well in excess of 25 Watt RMS @ 8 Ohm (1KHz sine wave)
Sensitivity : 200mV input for 25W output
Frequency response : 30Hz to 20KHz -1dB
Total harmonic distortion @ 1KHz : 0.1W 0.014% 1W 0.006% 10W 0.006% 20W 0.007% 25W 0.01%
Total harmonic distortion @10KHz : 0.1W 0.024% 1W 0.016% 10W 0.02% 20W 0.045% 25W 0.07%
Unconditionally stable on capacitive loads
Power supply for this 25 watts power amplifier based MosFet can be found here.
Parts list : Resistor R1,R4 : 47K 1/4W R2 : 1/4W R3 : 1K5 1/4W R5 : 390R 1/4W R6 : 470R 1/4W R7 : 33K 1/4W R8 : 150K 1/4W R9 : 15K 1/4W R10 : 27R 1/4W R11 : 500R 1/2W Trimmer Cermet R12,R13,R16 : 10R 1/4W R14,R15 : 220R 1/4W R17 : 8R2 2W R18 : R22 4W Resistor (wirewound) Capacitor C1 : 470nF 63V Polyester Capacitor C2 : 330pF 63V Polystyrene Capacitor C3,C5 : 470µF 63V Electrolytic Capacitors C4,C6,C8,C11 : 100nF 63V Polyester Capacitors C7 : 100µF 25V Electrolytic Capacitor C9 : 10pF 63V Polystyrene Capacitor C10 : 1µF 63V Polyester Capacitor Semiconductor Q1-Q5 : BC560C 45V 100mA Low noise High gain PNP Transistors Q6 : BD140 80V 1.5A PNP Transistor Q7 : BD139 80V 1.5A NPN Transistor Q8 : IRF530 100V 14A N-Channel Hexfet Transistor Q9 : IRF9530 100V 12A P-Channel Hexfet Transistor
