Monday, October 19, 2015

DIY Make Filter Subwoofer 16 Hz (Membuat filter subwoofer 16Hz)

Here is the other filter of subwoofer.
Filterization is under 16Hz. which is the lowest audio frequency that can heard by human.
Here is the schematic.
Filter subwoofer 16 Hz

The complete schematic can find here.

Good Luck

DIY Make a Powerfull Subwoofer filter (Membuat filter subwoofer)

Here is my subwoofer project.
One of my subwoofer speaker is using this filter. with woofer (8ohm) speaker can transform to subwoofer system.
First time, you should make the filter to passing low sound and reject high sound.

Find the circuit here.

After finish make the filter, use power amplifier to drive the speaker. I only use 150watt OCL power amplifier.

Make two speaker in seri to get resistance 16 Ohm.
Don't make it in paralel, because the resistance is going to 4 Ohm, and it makes the speaker damage.

I use 8 inch woofer speaker by 2 pcs in one box.

the final subwoofer is like this. I placed in my car.
Finished Subwoofer
Just feel the power of low sound and enjoy.
If you don't get the lowest sound. kindly to double filter. the result is very powerfull, and change the speaker into real subwoofer speaker.

Good luck

DIY Surround Sound Filter (Membuat sendiri filter surround)

Today, I'm going to make a surround sound filter.
This filter can make the sound is life. as like in concert.

The first think is we should have 4 speakers, which is placed on front 2 pcs and rear 2 pcs.
Let's see the schematic. find it here.

There is symbol in output. here is the description:
LF --> Left Front.
LR --> Left Rear.
RR --> Right Rear.
RF --> Right Front.

The placement is easy enough. find it here.

This combination can make the sound is surrounded us. the other side, the cost is very cheap.

For CTR and Sub is my next project.
The target is home theater 5.1

Just wait for my home theater project.

Good Luck.

Make your own mini downloader AT89S51 using Parallel interface

Newest downloader is so practical and simple. But, it’s better for us to try mini downloader for AT89S51 using parallel port. The figure are displayed is illustrate only for the downloader is like. When you are change to another shape, it’s no problem. The IC is easy to get and find in electronic component shop. The making is easy, you don’t have to order the PCB which offered in  cm-square. Because the circuit is very simple.
Yup, you are right, you can download the circuit in the internet or a copy from your friend. For me, I tried as like published in the internet. The first time, I using parallel port which is include on the desktop PC.

The circuit is simple, just need x-tal 12MHz, capasitor 30pF. +5V VCC is use USB port.
Figure 1. Mini downloader

Figure 2. USB cable power
Component needed:

These circuit is tried for AT89S51/52 is always work. Although the connection is direct to LPT port behind PC. For the supply just connect to USB port, use USB cable and cut at the other side, and attach housing 2 pin.  

The schematic is here.

About LPT connector, use DB25 male. in order match on the desktop connector. 40 pin socket is for connecting the IC and any module. 40 pin are set as like the Micro pin configuration. The function is for plug and play without release the IC. And the software, you can download it in the internet or you can contact to my mail, I’ll send it to you.
And for the training module, you can make it you self or use your imagination for the input and the output. The examples are going to describe on the next session. This time, we just making the downloader.
- 1 pcs mikro AT89S51
- 1 pcs x-tal 12MHz
- 2 pcs capasitor 33pF
- 1 pcs capasitor 10uF
- 1 pcs LED + resistor 100ohm.
- 1 pcs socket 40 pin male.
- 1 pcs DB 25 male.
- 1 pcs PCB make your own (etching your self

Good Luck

Wednesday, September 30, 2015

Make a Resistance check machine with Arduino (Membuat mesin pengecekan resistansi)

Salam Elektro

Today, I would like to share about how to make resistance check with arduino.
Kali ini, saya akan membagi bagaimana cara membuat pengecekan resistansi dengan arduino.

First time, prepare the material.
- Arduino Uno or other arduino. (I use Uno in my board).
- Potensiometer 5Kohm
- Switching power supply 12 volt
- Buzzer
- ULN 2003A
- Relay 12 volt
- LCD 16x2
- Connector banana female
- Pushbutton
- Power switch
- LED red and green
- Enclosure

Here is the fix machine

Hasil mesin pengecekan resistance

Connect wire from arduino to LCD, button and relay.
Here is the diagram block
Block diagram
Schematic diagram is here.

LCD guide
LCD guide pin out

 Schematic driver buzzer find it here.

Note of function

This machine can be set on some model, which is mean we can add some specification minimum and maximum.When the value is out of spec, then buzzer is  buzzing.
Mesin ini bisa di set ke beberapa model, yang mana maksudnya kita bisa menambahkan beberapa spesifikasi minimum dan maksimum. Bila nilai resistance berapa diluar spec, maka buzzer akan berbunyi.

Let's see the inside
Mari kita lihat hasil rangkaiannya walau tidak sebagus yang dipikirkan.
Bentuk dalam mesin
The Machine code is here.

Good Luck
Selamat mencoba