25 watts power amplifier Archives - Amplifier Circuit Design

25 Watt Power Amplifier based MosFet

Amplifier Circuit — Wed, 17 Aug 2011 00:51:34 +0000

25 watts power amplifier based MosFet circuit diagram. 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.

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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

The post 25 Watt Power Amplifier based MosFet appeared first on Amplifier Circuit Design.

25/50 W Power Amplifier Class D based MAX9709 chip

Amplifier Circuit — Wed, 27 Jul 2011 16:05:04 +0000

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Features chips as follows :

Supply voltage,

:10 … 22V

Supply current absence of a signal, mA

:20mA

Maximum Power Output:

in stereo (CG = 10%)

:29W

in mono (CG = 10%)

:50W

“Normal” Power Output:

in stereo (CG = 0.1%)

:12W

in mono (CG = 0.09%)

:22W

S / N ratio (weighted)

:96%

Efficiency (max)

:87%

The device has built-in overload protection, output current limiting, suppression of the “click-and-pop” when you turn on and off. There is also a programmable gain amplifier and switch-off temperature.

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As can be seen, the device is connected to two power supplies – 22 V – for analog and digital 5-12V. If it is assumed that the chip will be powered by 12 volts, the findings for the power supply can be combined. Otherwise, it is enough to feed the analog part to connect any integral stabilizer – TIPPING or LM.