Showing posts from 2018

4 life hack you may not know

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

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

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

Two ways light switch wiring diagram

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

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!!!

Good news!!! get https for blogspot custom domain for free

Blogspot gives you a free upgrade from HTTP: to  HTTPS: for free. Now your website will rank better in Google search with HTTPS and a user will feel more secure when surfing to your website. 

What is HTTPS? According to google support website. What a security certificate isWhen you go to a site that uses HTTPS (connection security), the website's server uses a certificate to prove the website's identity to browsers, like Chrome. Anyone can create a certificate claiming to be whatever website they want. To help you stay on safe on the web, Chrome requires websites to use certificates from trusted organizations.
How to get free HTTPS to your Blogspot (including custom domain one)When you blogger dashboard you just navigate to Setting > Basic and you will see the page like the image below. All you have to do is Change HTTPS Availability and HTTPS redirect to yes and your website will automatically change to HTTPS in a few minutes.

I hope this tips will make your website more prof…

Humidity sensor with led alarm | Arduino project

This page contains Arduino Humidity sensor with led alarm source code. This project is good for someone who wants to make a humidity meter or hygrometer with led alarm if humidity and temperature over a threshold. It's easy to make and doesn't require an external power supply, just use power from an Arduino UNO R3 board (USB power compatible with this project).

Electronic components list:
1 x Arduino Uno R3
1x 20 x4 I2C LCD display
1 x AM 2320 humidity/temp sensor
1 x 5 mm led ( 2 x if you plan to use led for pin 13 instead built-in led)
1 x 1000 ohms resistor ( 2 x if you plan to use led for pin 13 instead built-in led)
Any USB power adapter, 500 mA current at least.

Here is the Arduino code:
AM 2320 library
LCD display i2c library

#include <Wire.h>
#include <AM2320.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 20, 4);
AM2320 th;
int led2 = 12;

How to make an emergency led light

This video shows you how to make an emergency light, it is the very important thing when a 110/220 AC power failure. This circuit will make your life better!!!This emergency led light project use minimal electronic components and can work over 10 hours and recharge automatically. The circuit uses USB power supply so you can use old smartphone adapter as power supply, 5 volts, and 1 Ampere is the minimum required for this circuit.
Electronic component list:
1 x 18650 Li-ion battery1 x TP 4056 Li-ion battery charger module1 x 5 volts relay1 - 10 x 100 ohms resistor1 - 10 x low current white led (another color is ok but white led is the best)5 volts 1 Ampere USB type c adapterReal electronic components picture
After you got all the electronic components I listed above, it's time to make the circuit by watching my video.

This circuit has a very long life, all you need to change is 18650 battery(many years). You may need to recharge the battery once a month by disconnect USB adapter and le…

How to build high current hall effect sensor

I published hall effect sensor circuit diagram and my audience asked me how to make a hall effect sensor that has a high current capability, so I made it for him and for all of you who want to build high current hall effect sensor.

Normally, hall effect sensor used for detect magnetic field and send output to a microcontroller, that means any hall effect sensor doesn't need to have high current output. However, if you want to drive motor or any high current device without a microcontroller, this circuit is the best for you.
List of components for this project:
1 x IRF 9540N (P channel MOSFET) 1 x A3144 hall effect sensor 1 x 1 kilo-ohms resistor 1 x 10 kilo-ohms resistor optional (use for led indicator) 1 x 1 kilo-ohms resistor 1 x White, red, blue or any other low current led
Note: all resistor for this circuit is 1/4 watt, 20 % tolerance is ok with this circuit.

The principle of this circuit:
When hall effect sensor detects magnetic field, it sends output low (0 volts) to P channe…

How to make an IR toggle switch

Hello, today I will show you how to make an IR toggle switch with Arduino and a Mosfet, it has far more detection range than capacitive touch device and easy to build. The circuit is easy to use and use minimal components to make a job done, now let's start
Components list:
R1 = 100 ohms resistor
R2 = 470 Kilo-ohms resistor
R3 = 10 Kilo-ohms resistor
R4 =1000 ohms or 1 kilo-ohms
IR1 = infrared led
IRR1 = infrared receiver
led = low forward voltage led, you can find it on any electronic part store
Tube1 =Shrink tubing
1 x irf9540n p-type Mosfet

If you have the components I list ready, it's time to upload this code to your Arduino UNO r3

/* switch
 * Each time the input pin goes from LOW to HIGH (e.g. because of a push-button
 * press), the output pin is toggled from LOW to HIGH or HIGH to LOW.  There's
 * a minimum delay between toggles to debounce the circuit (i.e. to ignore
 * noise).  
 * David A. Mellis
 * 21 November 2006
* little edit by
*16 Januar…