LOW PASS FILTER FOR SUBWOOFER
The low pass filter, as its name implies, allows the passage of low frequency and high frequency limits. Regardless of the frequencies that fall, only allowing frequencies will pass the filter. Video tutorial
construction of low pass filter
Given that spaces are becoming more limited, the owners of the shops and bars in the city, now require that videorockolas are small and glue on the wall. In addition, speakers are not as great as before. For this reason, the subwoofer has become indispensable to recover the lost low by the small size of the stereo speakers.
This circuit, connected to a mono amplifier and speaker using an air suspension, becomes the basis of a good subwoofer.
after downloading the PDF of the page, print the printed circuit on Bakelite, either technique ironing, or screen printing. Remember that the form is ready for screen printing. If you want to print Ironing with the technique, reverse (mirror mode). I remember reading
section recommendations before doing this project.
Taking the form ready, place the resistance of 100 k and 1k, with the leftovers of the legs, make the jumper.
Weld correctly, you must join, welding, soldering and workpiece at the same time, and proceed quickly to avoid damaging the components. Remember that the weld quality depends on the success of any electronics project it undertakes.
the photos to see larger, click on them.
recommend using a base for built-in 8-pin, in order to facilitate change for maintenance or to try another operational amplifier.
horn is so easy to change without damaging the printed circuit tracks.
Then place the ceramic capacitors, which have no polarity.
Since ceramic capacitors support up to 50 volts, no need to specify the voltage in the list of materials, since the low pass filter is supplied with + / -12 volts.
Although ceramic capacitors are used in high frequency circuits or grounding, in this case its function is to prevent the leakage of noise from the source.
Place a 0.22 microfarad capacitor polyester, keep in mind that the higher the capacitor, high frequencies are less restrictive, and the lower its value, it restricts the passage of high frequencies. This depends on individual taste.
For the low frequency cut is complete, remember to use an air suspension speaker, particularly to reproduce low frequencies. In addition the speaker is also important. Please note all these details to obtain an excellent result.
Now place the electrolytic capacitors, taking into account their polarity marked on the mask components.
components in the mask shows the direction of the condenser, and condenser brings a strip that shows the negative pole. Moreover, when they are new, bring negative leg shorter.
Place TL071 integrated circuit, taking into account the position shown in the mask components.
The TL071 is a J-FET operational amplifier ( field effect transistor junction ) low noise, high speed, high voltage bipolar transistors, especially in a monolithic integrated circuit.
This device is characterized by its low power consumption, low temperature and pressure compensation coefficient.
Feeding a low pass filter is symmetrical, so we recommend making symmetrical source regulated, which is in the projects section of our website. If a transformer fails with central TAP, can make voltage doubler that is in the PDF of the microphone and preamplifier, using a single transformer.
can tweak any of the amplifiers of the page to leave monophonic and make their own subwoofer, accompanied by the low pass filter.
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