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…

tda 7052B full wiring diagram, easy to understand

I accidentally bought IC TDA 7052b from local electronic store (it should be TDA 7052) . I have been finding circuit diagram in google but seem the circuits not working so I decided to test it in my own way. Finally, I found the best wiring diagram that works, so I think I must share it to help DIY lover like me.
TDA 7052B is bridge-tie load amplifier ic, so no need output capacitor coupling (Better bass respond and bass quality) 1.2 w@ 8 ohms load amplifier ic. The chip sound better compare to class d amplifier(pam8403) but less output power.
The image below shows how to wiring proper volume control for TDA 7052B
In real life, the IC can connect to 4 ohms loudspeaker without any problem.

List of component:

1 TDA7052 B
2 100 uf 16 volts electrolytic capacitor(C2)
3 10 uf 16 volts electrolytic capacitor (C3)
4 0.1 uf mks capacitor(C1)
potentiometer(volume control)
6 8 ohms 2 watts speaker( I use 4 ohms without problem).
7 DC source 3-18 volts (5 -9 volts recommend)

Connect input to volume control directly.

TDA 7052 B with DC volume control wiring diagram. You will see that the input pin(2) connect to output of signal source directly
(Sound may be better because signal does not pass through potentiometer,less passive component mean better sound quality).

The video shows testing circuit with failed circuit on the internet compare.

Need more power? 2.5 watts amplifier wiring diagram is waiting for you here