300W POWER AMPLIFIER FOR SUBWOOFER CIRCUIT DIAGRAM

300W POWER AMPLIFIER FOR SUBWOOFER CIRCUIT DIAGRAM

Continuous power into 8 ohms is typically over 150W (250W for ±70V supplies), and it can be used without additional transistors at full power into an 8 ohm load all day, every day. The additional transistors are only needed if you want to do the same thing into 4 ohms at maximum supply voltage

Although I have shown MJL4281A and MJL4302A output transistors, because they are new most constructors will find that these are not as easy to get as they should be. The alternatives are MJL3281/ MJL1302 or MJL21193/ MJL21194.

Because this amplifier circuit operates in "pure" Class-B (something of a contradiction of terms, I think), the high frequency distortion will be relatively high, and is probably unsuited to high power hi-fi. At the low frequency end of the spectrum, there is lots of negative feedback, and distortion is actually rather good, at about 0.04% up to 1kHz. My initial tests and reports from others indicate that there are no audible artefacts at high frequencies, but the recommendation remains.
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300W OCL AUDIO AMPLIFIER CIRCUIT DIAGRAM

300W OCL AUDIO AMPLIFIER CIRCUIT DIAGRAM

The amplifier circuit is very Cheapest and cans be powered from 24 to 32 V/5A dual power supply. You must try this circuit. Its working great. Because 4 transistors (2 x 2n3055 and mj 2955) on the final amplifier will of some very hot then add the aluminum finned cooler and the fan so That the transistor is not too high temperatures
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170W AMPLIFIER BTL LM4651 & LM4652 CIRCUIT DIAGRAM

170W AMPLIFIER BTLLM4651 & LM4652 CIRCUIT DIAGRAM

IC LM4651 is a integrated conventional pulse width modulator driver IC. The IC contains short circuit, under voltage, over modulation, and thermal shut down protection circuitry. The LM4651 also contains a standby function which shuts down the pulse width modulation minimizing supply current.

IC LM4652 is a fully integrated H-bridge power MOSFET IC in a TO-220 power package. The LM4652 has a temperature sensor built in to alert the LM4651 when the die temperature of the LM4652 exceeds the threshold. Together, these two IC's form a simple, compact high power audio amplifier solution complete with protection normally seen only in Class AB amplifiers. Few external components and minimal traces between the IC's keep the PCB area small and aids in EMI control.

Absolute Maximum Ratings LM4651 & LM4652

  • Supply Voltage ± 22V
  • Output Current (LM4652) 10A
  • Power Dissipation (LM4651) 1.5W
  • Power Dissipation (LM4652) 32W
  • ESD Susceptibility (LM4651) 2000V,
  • ESD Susceptibility LM4652 (pins 2,6,10,11) 500V
  • ESD Susceptibility (LM4651) (Note 5) 200V
  • ESD Susceptibility LM4652 (pins 2,6,10,11) 100V
  • Junction Temperature 150°C
  • Soldering Information N, TA and TF Package (10 seconds) 260°C
  • Storage Temperature -40°C to + 150°C
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150W BRIBGE AMPLIFIER WITH TDA 7294 CIRCUIT DIAGRAM

150W BRIBGE AMPLIFIER WITH TDA 7294 CIRCUIT DIAGRAM

As you can see, there are provisions to use TDA7294 well. This circuit is almost identical, but a specification higher. There are links on the board to connect contacts 1 and 5 (it should not be connected to the TDA727). Use TDA7294, fees can run bridged (BTL or bridge tied load) to about 150 W at 8 ohms. I think P87B be used to provide phase signal is necessary for BTL operation. Although it is common to see AMP as a reversal, there is a very low resistance at first, and may lead to unacceptable pressures and possible distortion. P87B be managed separately by each amplifier, and the best way to control the amplifiers.While parallel operation is often recommended, I strongly recommend that you run the amps in parallel. There are very strict requirements for greater tolerance for parallel operation – usually amplifiers must correspond to 0.1% or more for all audio traffic and beyond. A very low output resistance of members, even inconsistencies 100mV (instantly, any voltage and frequency) can cause large amounts of current flowing through the circuits. Although 0.1O resistors are usually offered, inconsistencies 100mV voltage (0.15% at the peak voltage 60V) 0.5A cause a circulating current. This leads to overheating and protection of anger involved.
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150W OCL POWER AMPLIFIER CIRCUIT DIAGRAM

150W OCL POWER AMPLIFIER CIRCUIT DIAGRAM

The amplifier circuit is very CHEAPEST and Can be powered from 24 to 32 V/5A dual power supply. You must try this circuit. Its working great. Because Transisitor on the final amplifier will of some very hot then add the aluminum finned cooler and the fan so That the transistor is not too high temperatures.

Note:

Use 24V/5A dual power supply.
Connect a 50K POT in series with the input as volume control if you need.Not shown in circuit diagram

maximum rating Transistor 2N3055 NPN and MJ2955 PNP

Collector-Base Voltage : 100 V
Collector-Emitter Voltage: 70 V
Collector-Emitter Voltage: 60 V
VEBO Emitter-Base Voltage: 7 V
IC Collector Current: 15 A
IB Base Current: 7 A
Total Dissipation: 115 W
Storage Temperature: -65 to 200 oC
Tj Max. Operating Junction Temperature 200 oC

Source: elektroarea.blogspot.com
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100W POWER AMPLIFIER USING TDA7293 CIRCUIT DIAGRAM

100W POWER AMPLIFIER USING TDA7293 CIRCUIT DIAGRAM

The TDA7293 amplifier specifications might lead you to believe that it can use supply voltages of up to ±50V. With zero input signal (and therefore no output) it might, but I don't recommend anything greater than ±35V if 4 ohm loads are expected, although ±42V will be fine if you can provide good heatsinking. In general, the lower supply voltage is more than acceptable for 99% of all applications, and higher voltages should not be used unless there is no choice. Naturally, if you can afford to lose a few ICs to experiments, then go for the 42V supplies (obtained from a 30+30V transformer).
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70W POWER AMPLIFIER USING 2N30055 - MJE2955 CIRCUIT DIAGRAM

70W POWER AMPLIFIER USING 2N30055 - MJE2955 CIRCUIT DIAGRAM

This amplifier is fairly well behaved for turn on, and should issue (at worst) the smallest click as power is applied. When power is removed, after about 5 seconds or so, there will normally be a low level thump - this is not dangerous to speakers, unless used in tri-amp and directly connected to the tweeters - DO NOT DO THIS - not with any amp. Always use a capacitor in series with tweeters (see Bi-Amplification, Some thoughts on Tri-Amping).
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60W AMPLIFIER MOSFET IRFP240-IRFP9240

60W AMPLIFIER MOSFET IRFP240-IRFP9240

The supply rails prudentially voltage was kept at the rather low value of + and - 40V. For those wishing to experiment, the supply voltage rails could be raised to + and - 50V maximum, allowing the amplifier to approach the 100W into 8 Ohm target.

Note:

  • A small, U-shaped heatsink must be fitted to Q6 & Q7.
  • Q8 & Q9 must be mounted on large heatsinks.
  • Quiescent current can be measured by means of an Avo-meter wired in series to the positive supply rail and no input signal.
  • Set the Trimmer R10 to its minimum resistance.
  • Power-on the amplifier and adjust R10 to read a current drawing of about 120 - 130mA.
  • Wait about 15 minutes, watch if the current is varying and readjust if necessary.



List Component:

R1______________47K 1/4W Resistor
R2_______________4K7 1/4W Resistor
R3______________22K 1/4W Resistor
R4_______________1K 1/4W Resistor
R5,R12,R13_____330R 1/4W Resistors
R6_______________1K5 1/4W Resistor
R7______________15K 1/4W Resistor
R8______________33K 1/4W Resistor
R9_____________150K 1/4W Resistor
R10____________500R 1/2W Trimmer Cermet
R11_____________39R 1/4W Resistor
R14,R15___________R33 2.5W Resistors
R16_____________10R 2.5W Resistor
R17_______________R22 5W Resistor (wirewound)
C1_____________470nF 63V Polyester Capacitor
C2_____________470pF 63V Polystyrene or ceramic Capacitor
C3______________47µF 63V Electrolytic Capacitor
C4,C8,C9,C11___100nF 63V Polyester Capacitors
C5______________10pF 63V Polystyrene or ceramic Capacitor
C6_______________1µF 63V Polyester Capacitor
C7,C10_________100µF 63V Electrolytic Capacitors
D1___________1N4002 100V 1A Diode
D2_____________5mm. Red LED
Q1,Q2,Q4_____MPSA43 200V 500mA NPN Transistors
Q3,Q5________BC546 65V 100mA NPN Transistors
Q6___________MJE340 200V 500mA NPN Transistor
Q7___________MJE350 200V 500mA PNP Transistor
Q8___________IRFP240 200V 20A N-Channel Hexfet Transistor
Q9___________IRFP9240 200V 12A P-Channel Hexfet Transistor
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60W POWER AMPLIFIER CLASS B CIRCUIT DIAGRAM

60W POWER AMPLIFIER CLASS B CIRCUIT DIAGRAM

Capacitor C1 regulates the low frequencies (bass), as the capacitance grows, the low frequencies are getting louder. Capacitor C2 regulates the higher frequencies (treble), as the capacitance grows, the higher frequencies are getting quieter.

This is a class B amplifier, this means, that a current must flow through the end transistors, even if there is no signal on the input. This current can be regulated with the 500 Ohm trimmer resistor. As this current increases, the sound of the amplifier is better, but output transistors are dispatching more heat. If the current is decreased, the transistors are dispatching less heat, but the sound quality is decreased.
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56W AUDIO AMPLIFIER IC lm3876 or 3886 CIRCUIT DIAGRAM

56W AUDIO AMPLIFIER IC lm3876 or 3886 CIRCUIT DIAGRAM

Voltage gain is 27dB as shown, but this can be changed by using a different value resistors for the feedback path (R3, currently 22k, between pins 3 and 9). The inductor consists of 10 turns of 0.4mm enamelled copper wire, wound around the body of the 10 Ohm resistor. The insulation must be scraped off each end and the wire is soldered to the ends of the resistor.

The 10 Ohm and 2.7 Ohm resistors must be 1 Watt types, and all others should be 1% metal film. All electrolytic capacitors should be rated at 50V if at all possible, and the 100nF (0.1uF) caps for the supplies should be as close as possible to the IC to prevent oscillation.

The supply voltage should be about + / - 35 Volts at full load, which will let this little guy provide a maximum of 56 Watts (rated minimum output at 25 degrees C). To enable maximum power, it is important to get the lowest possible case to heatsink thermal resistance. This will be Achieved by mounting with no insulating mica washer, but be warned that the heatsink will be at the-ve supply voltage and will have to be insulated from the chassis.

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50 WATT RMS AUDIO AMPLIFIER

50 WATT RMS AUDIO AMPLIFIER

Note:

  • Transistor Q3 and Q4 must be in pairs with the heatsink.
  • Use a well regulated and filtered power supply.
  • Connect a 10K POT in series with the input as volume control if you need.Not shown in circuit diagram.


List Component:

  • R1 1 200 Ohm 1/4 W Resistor
  • R2 1 200K 1/4 W Resistor
  • R3 1 30K 1/4 W Resistor
  • R5 1 1K 1/4 W Resistor
  • R6 1 5K 1/4 W Resistor
  • R7,R10 2 1 Meg (5%) 1/2 W Resistor
  • R8,R9 2 0.4 Ohm 5 W Resistor
  • R11 1 10K Pot R12,R13 2 51K 1/4 W Resistor
  • R14 1 47K 1/4 W Resistor
  • C1 1 100uF 35V Electrolytic Capacitor
  • C2 1 0.011uF Capacitor
  • C3 1 3750pF Capacitor
  • C4,C6 2 1000pF Capacitor
  • C5,C7,C8 3 0.001uF Capacitor
  • C9 1 50pF Capacitor
  • C10 1 0.3uF Capacitor
  • C11,C12 2 10,000uF 50V Electrolytic Capacitor
  • U1,U2 2 741 Op Amp
  • U3 1 ICL8063 Audio Amp Transister Driver thingy
  • Q1 1 2N3055 NPN Power Transistor
  • Q2 1 2N3791 PNP Power Transistor
  • BR1 1 250 V 6 Amp Bridge Rectifier
  • T1 1 50V Center Tapped 5 Amp Transformer
  • S1 1 SPST 3 Amp Switch S2 1 DPDT Switch
  • F1 1 2 Amp Fuse
  • SPKR1 1 8 Ohm 50W Speaker
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45 WATT AMPLIFIER CLASS B

45 WATT AMPLIFIER CLASS B

Power transistors Q8 and Q9 Can be Used satisfactorily: 2N3055/MJ2955, TIP3055/TIP2955, TIP35/TIP36, MJ802/MJ4502 amongst others.
Power transistors Q8 and Q9 Should be mounted on a black, finned heatsinks as usual.

Technical data:

Output power (1KHz sinewave): 45 Watt RMS into 8 Ohms - 69W RMS into 4 Ohms
Sensitivity: 0.81V RMS input for 45W output
Frequency response @ 1W RMS: 15Hz to 23KHz -0.2dB
Total harmonic distortion @ 1KHz: 1W 0.008% 20W 0.008% 45W 0.016%
Total harmonic distortion @10KHz: 1W 0.01% 20W 0.015% 45W 0.025%
Unconditionally stable on capacitive loads

List Component

  • R1: 18K
  • R2: 3K9
  • R3,R6: 1K
  • R4: 2K2
  • R5: 15K
  • R7: 22K
  • R8: 330R
  • R9,R10: 10R
  • R11,R12: 47R
  • R13: 10R/1 Watt
  • C1: 1µF/63V
  • C2: 470pF/63V
  • C3: 47µF/25V
  • C4: 15pF/63V
  • C6: 220nF/100V
  • C6: 100nF/63V
  • D1,D2,D3,D4: 1N4148
  • Q1,Q2: BC560C
  • Q3,Q4: BC556
  • Q5: BC546
  • Q6: BD139
  • Q7: BD140
  • Q8: 2N3055
  • Q9: MJ2955
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30W CLASS AB AMPLIFIER CIRCUIT WITH TIP3055/TIP2955 SCHEMATIC DIAGRAM

30W CLASS AB AMPLIFIER CIRCUIT WITH TIP3055/TIP2955 SCHEMATIC DIAGRAM
To set the above amplifier up, set R1 to max and R12 to 0. After doing this successfully, power on the amplifier. Set R1 so that the measured output offset is between 30 and 100mV. Once set, adjust R12 slowly to achieve a quiescent current of around 120mA. Keep checking the quiescent current as the amp heats up as it might change due to voltage drop changes in the output devices caused by heat. The heatsinks should be 0.6K/W or less for two amplifiers.
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