Posts

Showing posts from July, 2016

how to use a digital multimeter

Image
A multimeter is a tool that uses to measures electrical characteristic such as voltage, ampere, resistance. Using a multimeter and basic knowledge of ohm's law can help electronics projects much easier.There is two type of multimeter one is a digital multimeter and another is an analog multimeter. The advantage of digital multimeter is easy to read value, lower power consumption, and higher price model can measure diode, capacitance, frequency, duty cycle, inductance, the temperature you can call it all in one multimeter instead of a multimeter.


How does a multimeter work?Basic functions of multimeter are measure voltage, ampere, and resistance. A multimeter changes electrical characteristic values to numbers for digital multimeter or meter scale for an analog multimeter.


What type of multimeter you need: - If your project involves high dc current you must use high DC current type multimeter, the high current multimeter probe usually bigger and have separate high DC/AC current measure…

PAM 8403 board amp wiring diagram

Image
PAM 8403 is a portable 3 watts stereo class d amplifier that uses only 5 volts D.C. to operate. The amplifier board is easy to wiring and very small size, you can make a small amplifier project that not requires high voltages to work.The first thing you need to know. PAM 8403 cannot bridge together because the amplifier is already bridge-tie-load output configurationOver 6 volts can damage the amplifier module, if you want higher power you can check 10 watts class d amp PAM 8610 hereYou must use shield wire connect from input source to volume control and from volume control to the amplifier board input if you don't want your amplifier to suffer from parasitic oscillation (sound like JeeeeJeeee) Today I will show you how to wire PAM 8403 board amp that easy to understand. Let's see image below.
You can see that two speakers do not share output ground like normal amplifier because PAM 8403 is a  bridge-tied-load amplifier, if each speaker wire touches each other the amplifier IC wi…

How to add power supply filter capacitor to amplifier board.

Image
I saw a new comment on my video, he asked me how to add a filter capacitor to amplifier board D.C. power supply. I think it's a good question so I will explain it here.
What is a power supply filter capacitor?

It is the capacitor that used to filter AC ripple from DC power supply present to amplifier board. If an amplifier has low capacitive power supply capacitor, it may present a little hum(50/60 Hz low-frequency sound) that you can hear in a quiet room.

The capacitor also stores power and bring it instantly to your amplifier when an amplifier needs more power for a short period of time such as  explosion sound in a movie.

However, If an amplifier has high-frequency power supply noise from a switching power supply, small capacitor need to parallel to a power supply and must be attached close to power amplifier IC as much as possible.

Below pictures are the place that you add power supply capacitor.



How to connect volume control to an amplifier

Image
I saw a comment on my Youtube video, he asked me how to connect any amplifier module to a volume control or potentiometer. I think so many people who want to start an electronic project must know this basic wiring too, I hope this wiring diagram will help an electronic DIYer like me.First thing you need to know:use shield wire for an input signal to volume control and from volume control to amplifier if you don't want you amplifier suffers from parasitic oscillation (sound like JeeeeJeeeee).keep a wiring as short as possible.use low resistive value volume control (5-10 kilo-ohms) if the amplifier has random parasitic noise when you turn a volume control up or down.volume control is a potentiometer.Volume control principle is a signal divider, the more volume control output(yellow line) near input signal source(pink line) the most signal flow to an amplifier. When you lower a volume control the resistive value between a volume control output and an input signal are increase and cau…