Resistor color code

A resistor is the most important electrical component in almost every electronic circuit, it can limit current to any load such as led, transistor, opamp, etc. We must read resistor color code if we want to know the resistive value, tolerance, temperature coefficient. Resistors have different color bands (3,4,5,6) the more color bands the more resistor's information.Now let's start with 3 bands resistor color code.

The above resistor has only 3 bands First digit, Second digit, and multiply. A 3 bands resistor color code has fixed +/-20% tolerance that means if color code value is 1,000 ohms the real life resistive value may be +/- 200 ohms. 
4 band resistor color code

A 4 bands resistor color code has tolerance value color strip, the resistor on an above picture has 5% tolerance. This type of resistor uses in a regular circuit such as television,radio,washing machine.

5 bands resistor color code

A 5 bands resistor color codes have third digit color bands.
1(first digit) 0(second dig…

PAM 8403 board amp wiring diagram

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.

First thing you need to know.
  • PAM 8403 cannot bridge together because the amplifier is already bridge-tie-load output configuration
  • Over 6 volts can damage the amplifier module, if you want higher power you can check 10 watts class d amp PAM 8610 here
  • You 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-tie-load amplifier, if each speaker wire touches each other the amplifier IC will shut down or damage. You also check that the right speaker + connects to R + sign from amplifier board and speaker - must connect to R - and check left speaker wiring too if you reverse speaker polarity you loudspeaker may produce less bass.

Vcc sign is positive polarity (+)
GND is ground or negative polarity (-)
The amplifier inputs use same ground from signal source you can see how to connect volume control to amplifier here

PAM 8403 board amplifier use 5 volts but need 1.5 amp for good sound so beware that you do not play loud music if you use computer USB power supply because the computer USB socket can supply 500 - 1000 mAh. you can see PAM 8403 sound test here

Enjoy your electronic hobby!!!