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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 glueHorse clampPlier 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.



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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


Cellphone white spot on back body repair

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My vivo v9 has the ugly white spot on it. Don't think you can save your phone color by using a back cover, some small particles can enter in a phone case and cause severely scratches or white spot like my vivo v9 phone. However, you can fix it like a car paint repair job.

See video below about how to repair back spot color on your smartphone.


Simple class a audio amplifier circuit diagram

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This post shows a video about how to make a simple class a single-ended(the most transparent sound amplifier circuit). The circuit has low output power because I want to make the audio amplifier that sounds good but not generate to much heat to my room(class a generate heat even it stay idle).
The first part in this video is a sound test and a circuit is last.
😊
The amplifier has a low output impedance because of high negative feedback from op amp and also lower THD. The disadvantage of this circuit is it has low power, so you must find high sensitivity speaker if you want high sound volume and it not good for an action movie.
This circuit draw current from op amp around 12 mA (according to lm 4562 datasheet) but if increase bias current at output state it may draw more current from the op amp because the op amp negative feedback try to maintain output to match non inverting input voltage reference.

see the video here


see the method to connect power amp input to volume control here
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Two ways light switch wiring diagram

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If you want to know how to connect 2 ways light switch, this post is the right place for you. 2 ways light switch normally used for up-down stair light switch that you can turn light on or off with both switch independently.

All you need for this project:
2 x two ways light switch
1 x mains testing screwdriver
some wire for 110/220 volts AC

You can see how it works and tips that prevent you from electric shock from below video.

Long range IR sensor circuit diagram

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In a previous post, I made an Infrared sensor that has a maximum range of only 5 centimeters but my audience want more detector range so I made the circuit for him and for all of you who interesting in DIY electronic project!!!The circuit use opamp comparator configuration that stable than a previous circuit that I use just two transistors to make the job done. This circuit has detector range about 25 centimeters and can easily adjust detector range easily with a potentiometer(R4 in the below picture). You may need to block strong light expose directly to an Infrared sensor or the circuit will always turn on forever.  You can find the electronic components details in the above picture and you can see the instruction on my video below.

You can ask any question on the comment box below if you have any question about this project. Enjoy DIY world!!!