Posts

How to improve bookshelf loudspeaker sound

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 My audience on my youtube channel asked me how to find a crossover network capacitance and inductance so I will make it here The speaker I made crossover network is a microlab b77. The speaker lacked the woofer's crossover network, no absorbent so I fixed it for cleaner sound and changed the tweeter's high pass filter to a better one. Step 1 Change the old capacitor to a metalized polypropylene capacitor (very clean sound). The capacitor value is 4 uf and the speaker is 8 ohms so the crossover frequency =1/6.28x8x4 = 0.004976 x 1,000,000 = 4976 Hz (x1,000,000 come from Farad to microfarad) If you want to find crossover frequency C= 0.1590/(R x F) x 1,000,000 for uf Step 2 Find induction for the woofer. L = .1592 x 4(woofer resistance)/4976(Hz) =1270 micro Henry x1000 = 0.127 mH but I has 0.1 mH so the crossover point may change a little but not much. If you want the complete sound you may find 0.127 mH Speaker crossover diagram. Step3 Add absorbent to the speaker cabinet. The

How to fix broken foldable plastic joint

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 Fix broken plastic joint, how it works. My hair steam plastic joint was broken and I need to change the whole part. So I decided to fix it my own way to save my money. All parts to make this fix: Hot glue flat washer Small screws Drill As you can see above picture, the joint is hard to repair by glue because the broken part missing. I need to find something that can do the job. This flat washer is good for the job. Let's see the instruction in the video below.

How to install water heater at home.

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This page shows you how I install a hot shower at my condominium. However, you need to have basic knowledge about electronics and you will be fine. First step: You need to cut off the circuit breaker before doing this works. Second step: Find the right wire color and meaning of the color. As you can see in the above picture, the ground wire always green in color, and the hot wire is black. Unlike DC current load AC current use black color as a hot wire but DC current use black as a ground. Third step: Check resistance between neutral and ground, it should be 0 ohms or no more than 1 ohms. The resistance above 1 ohm means that the ground wire has a problem and elb, elcb may not work. Last step: Connect three wires to a hot shower and everything will be finished. See the video below for the complete project.

Helmet face sheild scratches repair.

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This page shows you how to remove scratches from motocycle helmet face sheild. This method works well even the face sheild have so many scratches. The helmet face sheild is easy to has scratches but you don't need to change it because you can remove it by yourself. Normally, the helmet face shield made of plastic and a car polishing wax can remove scratches. However, the polishing wax dissolve some plastic and make it thinner so beware about it. See video below for the instruction and prove.

Simple Temperature Control Fan Speed circuit diagram

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Today I will show you how to make a very simple temperature control fan speed circuit. I use very minimal parts and works in real life. This circuit change 12 volts DC fan speed by temperature. The hotter the temp, the faster fan speed. The circuit principle is a voltage divider between T1 and 20 K potentiometer. When temperature increase, the Thermistor resistance decrease and make the voltage set point between T1 and R1 increase until it is higher than a Mosfet Vgs threshold and make a Mosfet change to ON state and conduct current to a fan. Below picture is the parts you need. Note: T1 is 10 K thermistor See the video below that shows how it work and full circuit diagram and the important of C1

Emergency fix camera tripod lever leg lock

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This article shows you how to fix a broken camera tripod or monopod lever leg lock. The tripod or monopod quick lever leg lock has many shape and size so this article will help you fix it without paying a very high cost. A camera tripod is a tool that helps photographer shooting a shake-free picture when shutter speed lower than minimum requirement(1/focal length for full frame camera). A tripod has three legs and one leg for a monopod. When you set a camera position, you need to adjust a tripod/monopod leg to your design high and lock the position with the leg lock. You can't adjust a tripod leg if it damage and the leg lock spare part is hard to find so this problem is the main reason that makes me wrote this article for people that face the same problem like me. Everything you need for this DIY Hot glue or epoxy glue Horse clamp Plier See the instruction video below

Repair vertical blue line on lcd monitor

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My AOC IPS LCD display had a dead vertical blue line and it was very annoying so I used the method in this video to fix the problem. I hope this method work for your LCD monitor too. What's cause the LCD display vertical line? The answer: The vertical line appears because of a low-quality LCD display or the LCD monitor panel exceed lifespan. This problem can't be fixed. However, the vertical line may appear because of connection wire is loose or glue degrade. This problem can be fixed by the method on the video below. Note: If you want a better result, you have to use hot air dryer blowing on the connecting wire that attaches on the control board. However, you should be very careful about too much heat from a hot air dryer, don't blow hot air too long or your LCD monitor will not working again.

high power led flasher circuit diagram

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This page shows you how to make a simple led flasher that can use with high current led bulb(10 Amperes for 12 volts led bulb). This circuit also can flash any led bulb both 12 volts and 220 volts and normal light bulb. The circuit uses minimal electronic components as you can see below picture. The circuit use IC 555 to send the signal to a relay so this circuit can withstand high current without generating any heat like another design. you can see video below for the instruction and test circuit. If you want to see the more interesting video. See my youtube channel here Easyandworksproject youtube channel

The simplest 12 volts led dimmer circuit diagram

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This page shows you how to make the simplest 12 volts led bulb, the led bulb that uses with solar cell or 12 volts adapter.  Why you should use 12 volts led bulb? The simple answer is the 12 volts led bulb doesn't have any flicker that makes your  Eye fatigue. This is the schematic diagram of this project This circuit is simple to make and very safe because the 7805 IC has short circuit protection, over current protection, thermal protection so this circuit is good for beginner to advance electronic DIYer. See the working circuit from the video below. If you love this project, please support us by Share this page to your friends.

How to fix separate zip under 30 second

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This post shows you how to fix separate zip, it fast and easy to do and cost 0$. All you need is an alligator plier and 30 seconds!!! See the video below for the method.

How to make an automatic cabinet/ wardrobe light

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This project will show you how to make an automatic cabinet/wardrobe light that uses only one battery. This circuit has a very long battery life and easy to install, it does not consume any energy when standby too. All parts you need: 1 x 5 volts led strip 1 x 18650 battery 1 x refrigerator door switch Soldering iron wire hot glue gun screws 18650 battery can supply around 3.7 volts but the 5 volts strip can operate without any problem. This automatic cabinet light doesn't consume any energy when standby because of the switch is just on/off switch that uses metal contact. Let's see how it works in the video below.

4 life hack you may not know

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Hello, today I will show you some life hack and repair that you never known. The methods time in the video shown below. 0:07 hack empty lighter to work again 0:35 Speaker dust cap repair 1:16 temporary increase smartphone sound volume 1:27 emergency cellphone stand