Easy and work project

It 's easy to power your small amplifier board from a laptop USB port because you don't need to find another power source and worry about battery empty. However, there is some drawback when you use USB port as your amplifier board power supply. First, you need to know that USB 2.0 can supply current up to 500 mAh/hour or USB 3.0 can supply current up to 900 mAh/hour but small class d amplifier board require over 6 watts of power for full output power (pam8403 board power consumption without calculating 17 percent loss in an amplifier board) That mean laptop USB port need to supply at least 1200 mAh/hour to amplifier board. What will happen if you use laptop USB port as an amplifier power source? - Your amplifier will not bring output more than 2.5 watts of music power. You don't have to worry about the output power if you play music not loud or play action movies/games. - If you trying to play loud music and your laptop USB port can not handle it your lapt...

A power amplifier is a home electrical appliance that amplifies small sound signal from audio sources such as DVD player, portable music player or Television to large sound signal that can drive big loudspeakers.  If you are a music lover, a stereo amplifier is a good choice for you, a stereo amplifier and a good pair of speakers can make you feel comfortable all day long. However, if you are a movie lover you may need a multi-channel amplifier to fulfill your need but the amplifier needs more space for speakers and sub-woofer, 2.1 channel amplifier is a good choice for a bass lover. However, If you are a DIY lover you may need to start your first project from 2 channel amplifier because it is easy to make and easy to troubleshoot the problems. You may have this question in you mind. Why DIY or consumer power amplifier sound different even output power are equal? The answers of mine are not from feeling but from an electrical character of a...

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. PAM 8610 board amplifier powe...

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 va...