Making A 300 Watt Sub Woofer Amplifier Circuit

In a few of the former articles we have adequately discussed making of numerous home theater phases and how to install the parameters. Now we are going to find out about the building of the final sub woofer amplifier phase, which is a mainstay of any home theater system.
As can be noticed in the figure (see at the end of the page), the theme is very much common in its kind. The input resistors execute the work of generating very high impedance at the input for reducing virtually any current penetration that can be hazardous to the circuit. Two

or three input capacitor networks are set for cancelling high frequencies and defending the amplifier from the excessive high frequency disturbances similar to RFs etc which may be above 300 kHz but as well as from very low frequencies that may lie below 2 Hz.
The above protections help to protect the amplifier from TIM distortions or transient intermodulation noises by avoiding any kind of potential RF interferences.
You can even see a few transistors after the input stage, that are configured in the differential amplifier manner. The current to this stage may be predetermined utilizing the collector resistors such that they optimally respond to the high output power requirements.
The next level encompasses the driver stage which effectively gets the signals from the former differential stage and processes them sufficiently for providing the final power output stage.
The power output stage features a few high-quality mosfets, the SK1058 and the J162 which are complementary units and connected in the push pull function.
Such mosfets are extremely advanced power equipment made particularly for power amplifiers and for driving high power sub woofers. The shown mosfets can take care of more than
seventy volts and very large 7 amps of currents, which makes it suitable for 400 watts amplifier purposes.
The 2 1N4148 diodes perform a major role for putting the quiescent current to the amplifier; these diodes are purposely employed in place of a preset for eliminating the complicated quiescent setting operations.
The amplifier would not require any prior configurations, just build it and put it to use.
When you build it, it’s all about connecting the output with a 450 watt sub woofer loudspeaker and putting on a small data to the input, might be from your cell phone, a Disc RCA output or from your PC USB port. Immediately, and I repeat instantly, you would be in a position to hear an overwhelmingly clean and seriously stimulated sound from the loudspeakers. Incorporate some enhancements to the sound, and you could well be astounded to notice the vibrating extreme bass notes from the audio speakers that may literally start wiggling many of the things placed on your furniture to ground.
I have personally analyzed this circuit and I am significantly amazed by the performance of this small “giant”, I am talking about this compact yet powerful 300 watt amplifier circuit.
If you happen to be still not satisfied with the power out of this set up, you might go on to add mosfets in parallel to the existing ones, after which you could ride your loudspeakers with its monstrous power outputs….so now you may just pump up the volume and go nuts... 


Article Written By Swagatam

Swagatam is a blogger at

Last updated on 25-07-2016 259 0

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