10W R.M.S. Audio Amplifier
The aim of the project was to make an audio amplifier that can deliver up to 10W R.M.S. power output. input can be given via computer/mp3 player or a mic (mic circuit explanation at the end). There are many different types of amplifiers tda2003 is probably a class b amplifier because its power consumption is quiet lower then normal amplifiers and also its noise is very low.
the purpose for which i chose this ic is that it has very less external components, very low distortion, very low input power and a corresponding high output power.
ABOUT THE IC
TDA2003 is a 10W car radio audio amplifier The device provides a high output current capability (up to 3.5A) very low harmonic and cross-over distortion. Completely safe operation is guaranteed due to protection against DC and AC short circuit between all pins and ground, thermal over-range, load dump voltage surge up to 40V
Here is some helping material:
1- the data sheet of tda2003
2- the schematics of the amplifier
3- and the PCB layout of the amplifier
these circuits are modified ones the one i fabricated was a bit different .the difference was in placing the components not any thing else. if someone wants. datasheet open with any .PDF reader while the schematics and layout can be opened by Proteus (software) 7.0 or above.
lets get started with the circuit the input form a computer or any other audio device will be given at the connector named as "input". u can even directly solder them if u want but the connectors are easy to handle as they can be disconnected and reconnected without soldering and de-soldering except for the first time.
Then the signal passes to the potentiometer named as RV1 it is just to control the input voltage and can be used as a volume control. c1 is a coupling capacitor and is used to block the dc portion present in the input signal.
c2 is present to reduce the distortion in the output as it is acting like a bypass capacitor (but u can see that there is 1ohm resistor except the ground so it is not actually the bypass cap.
c3 is there to reduce the ripple in the power supply and for no other purpose similarly c6.
c4 is an output coupling capacitor. (i don't know the reason why it is there because it is reducing the BASS of the circuit never tries to reduce it if someone tries do tell me what happened).
We all know that there is a magnet and a coil in a speaker so they are inductive and inductors do not allow AC to pass through them effectively so it is there to reduce the inductive effect of the speaker.
cx is present to reduce the higher frequency at the output terminal and also provide a feedback path to the amplifier.
OUTPUT POWER AND LOAD
Connect a power supply 8-18V i recommend that u connect 16V at least to get nice sound even when the volume is at its max u can purchase a power supply from the market OR u can use this link to make one for yourself
https://www.instructables.com/id/Power-supply-5vconst-0-12v-variable/
just replace the R2 and R22 resistors to 3k each to get +-16V (it was supplying +-12V)
at the output u can connect 2ohm/4ohm/8ohm Load to get 10W/8W/6W power respectively
Here is a demonstration video:
don"t rely on this because the normal microphone of the mobile can't receive the bass so it seems that it has no bass but actually its base is awesome and also the video has distortion but actually the distortion is very low (zero below 50%) volume) and negligible at 80% because the power supply is 12V, if it was 16 or 18V then the distortion would be even less at high volumes.
10W R.M.S. Audio Amplifier
The aim of the project was to make an audio amplifier that can deliver up to 10W R.M.S. power output. input can be given via computer/mp3 player or a mic (mic circuit explanation at the end). There are many different types of amplifiers tda2003 is probably a class b amplifier because its power consumption is quiet lower then normal amplifiers and also its noise is very low.
the purpose for which i chose this ic is that it has very less external components, very low distortion, very low input power and a corresponding high output power.
ABOUT THE IC
TDA2003 is a 10W car radio audio amplifier The device provides a high output current capability (up to 3.5A) very low harmonic and cross-over distortion. Completely safe operation is guaranteed due to protection against DC and AC short circuit between all pins and ground, thermal over-range, load dump voltage surge up to 40V
Here is some helping material:
1- the data sheet of tda2003
2- the schematics of the amplifier
3- and the PCB layout of the amplifier
these circuits are modified ones the one i fabricated was a bit different .the difference was in placing the components not any thing else. if someone wants. datasheet open with any .PDF reader while the schematics and layout can be opened by Proteus (software) 7.0 or above.
lets get started with the circuit the input form a computer or any other audio device will be given at the connector named as "input". u can even directly solder them if u want but the connectors are easy to handle as they can be disconnected and reconnected without soldering and de-soldering except for the first time.
Then the signal passes to the potentiometer named as RV1 it is just to control the input voltage and can be used as a volume control. c1 is a coupling capacitor and is used to block the dc portion present in the input signal.
c2 is present to reduce the distortion in the output as it is acting like a bypass capacitor (but u can see that there is 1ohm resistor except the ground so it is not actually the bypass cap.
c3 is there to reduce the ripple in the power supply and for no other purpose similarly c6.
c4 is an output coupling capacitor. (i don't know the reason why it is there because it is reducing the BASS of the circuit never tries to reduce it if someone tries do tell me what happened).
We all know that there is a magnet and a coil in a speaker so they are inductive and inductors do not allow AC to pass through them effectively so it is there to reduce the inductive effect of the speaker.
cx is present to reduce the higher frequency at the output terminal and also provide a feedback path to the amplifier.
OUTPUT POWER AND LOAD
Connect a power supply 8-18V i recommend that u connect 16V at least to get nice sound even when the volume is at its max u can purchase a power supply from the market OR u can use this link to make one for yourself
https://www.instructables.com/id/Power-supply-5vconst-0-12v-variable/
just replace the R2 and R22 resistors to 3k each to get +-16V (it was supplying +-12V)
at the output u can connect 2ohm/4ohm/8ohm Load to get 10W/8W/6W power respectively
Here is a demonstration video:
don"t rely on this because the normal microphone of the mobile can't receive the bass so it seems that it has no bass but actually its base is awesome and also the video has distortion but actually the distortion is very low (zero below 50%) volume) and negligible at 80% because the power supply is 12V, if it was 16 or 18V then the distortion would be even less at high volumes.
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