This circuit is a class AB stereo audio power amplifier designed for quality hi-fi applications using a TDA2005 module. It is easy to construct and has a minimum of
external components. The module has output current protection and thermal protection. This is the data book circuit which produces an excellent sound. The supply voltage required for this kit is 8-18V DC at 1 to 2 Amps.
Maximum output power will only be obtained with a power supply of at least 2A at 15V DC, and using 2 Ohm speakers (or 2 by 4 Ohm speakers in parallel). Extra filtering is unnecessary if operating from a battery.
The TDA2005 is class B dual audio power amplifier in MULTIWATT package specifically designed for car radio application: power booster amplifiers are easily designed using this device that provides a high current capability (up to 3.5 A) and that can drive very low impedance loads (down to 1.6Ω)
- High output power: PO= 10 + 10 W@RL= 2Ω, d=10%
- PO=20W @RL=4Ω, d=1%.
- High reliability of the chip and package with additional complete safety during operation thanks to protection against:
- OUTPUT DC AND AC SHORT CIRCUIT TO GROUND
- OVERRATING CHIP TEMPERATURE
- LOAD DUMP VOLTAGE SURGE
- FORTUITOUS OPEN GROUND
- VERY INDUCTIVE LOADS
- Flexibility in use: bridge or stereo booster amplifiers with or without boostrap and with programmable gain and bandwidth.
- Space and cost saving: very low number of external components, very simple mounting system with no electrical isolation between the package and the heatsink (one screw only).
- In addition, the circuit offers loudspeaker protection during short circuit for one wire to ground.
When the ratio is in the ON condition and the ground is accidentally opened, a standard audio amplifier will be damaged. On the TDA2005 protection diodes are included to avoid any damage.
A protection diode is provided to allow use of the TDA2005 with inductive loads.
The maximum operating DC voltage for the TDA2005 is 18V.
However the device can with stand a DC voltage up to 28V with no damage. This could occur during winter if two batteries are series connected to crank the engine.
The circuit offers loudspeaker protection during short circuit for one wire to ground.
Short Circuit (AC and DC conditions)
TheTDA2005 can with stand a permanent short-circuit on the output for a supply voltage up to 16V
High current (up to 10A) can be handled by the device with no damage for a longer period than the blow-out time of a quick 2A fuse (normally connected in series with the supply). This feature is added to avoid destruction, if during fitting to the
car, a mistake on the connection of the supply is made.
High current (up to 10A) can be handled by the device with no damage for a longer period than the blow-out time of a quick 2A fuse (normally connected in series with the supply). This feature is added to avoid destruction, if during fitting to the car, a mistake on the connection of the supply is made.
Schematic BTL power amplifier TDA2005
|C1,C2||2.2uF Capacitor electrolytic|
|C3,C4,C5||100nF – Capacitor polyester or ceramic|
|C6||10uF Capacitor electrolytic|
|C7,C8||100uF Capacitor electrolytic|
|C9,C10||220uF Capacitor electrolytic|
|C11||1000uF Capacitor electrolytic|
|IN||Terminal block connector 2 screws – Audio input|
|OUT||Terminal block connector 2 screws – Audio output|
|P1||100k – Logarithmic potentiometer|
|PWR||Terminal block connector 2 screws – Power supply|
|R1||120 Ohms – Resistor 1/4 Watt 5% – Brown, Red, Yellow, Gold|
|R2||1K Ohms – Resistor 1/4 Watt 5% – Brown, Black, Red, Gold|
|R3,R4||1 Ohm – Resistor 1/2 Watt 5% – Brown, Black, Gold, Gold|
|R5||2.2 KOhms – Resistor 1/4 Watt 5% – Red, Red, Red, Gold|
|R6,R7||12 Ohms – Resistor 1/4 Watt 5% – Brown, Red, Black, Gold|
|Miscellaneous||12 volt power supply, wires, heat sink, pcb, box, etc.|
All capacitor 25V.