If you see in the Audio car amplifier system or 12V mini amplifier for your room. I have collected 3 circuits that use IC single chip. They include TDA1554, TA822, and HA13118.
It’s a pity If you have these ICs in your hand but haven’t tried using them. Or you are repairing an old car stereo, may use these ICS
The TDA1554 amplifier circuit can be used to stereo amplifier 22W and 4 Channel Home audio 11 watts using 11-15V power supply voltage below we have 2 circuits
4 x 11 W single-ended or 2 x 22 W power amplifier
The TDA1554Q contains four amplifiers with differene input (two inverting and two non-inverting). And
We can use it single(four amplifier) or bridge Mode.
The gain of each amplifier is fixed at 20 dB (26 dB in BTL).
A special feature of this device is:
• low stand-by current (< 100 µA)
• low mute/stand-by switching current (low-cost supply switch)
• mute facility
1 NINV1 non-inverting input 1
2 INV1 inverting input 1
3 GND ground (signal)
4 RR supply voltage ripple rejection
5 VP1 positive supply voltage 1
6 OUT1 output 1
7 GND1 power ground 1 (substrate)
8 OUT2 output 2
9 n.c. not connected
10 OUT3 output 3
11 GND2 power ground 2 (substrate)
12 OUT4 output 4
13 VP2 positive supply voltage 2
14 M/SS mute/stand-by switch
15 n.c. not connected
16 INV2 inverting input 2
17 NINV2 non-inverting input 2
Basic block diagram inside TDA1554 Amplifier
See below it is basic block diagram inside circuit.
Then look at the circuit real using below.
4 Channel Home Audio Amplifier 11 watt using TDA1554
This amplifier circuit is easy to build. Just use a single IC, but it has 4 channels, 11 watts per channel.
Which it is Philip TDA1554 number. It is suitable for listening at home or in any vehicle.
Just use the power supply 12-15 volt or will be used to increase any home theater sound system.
In first 2-channel amplifier is front speakers. And 2 channel back can be surround sound speakers, too.
How it works
See the circuit diagram below.
4 Channel Home Audio Amplifier 11 watt using IC TDA1554
This circuit requires a power supply, 12 volts to 18 volts at Power consumption at 5A.
It has 4 inputs, pins 1, 2, 17, and 16. They are divided into 2 channels non-inverting (Pin 1, 17) and 2 channels inverting inputs (pins 2, 16).
Which we can pick usage as want the output as in-phase or out-of-phase.
The output will be 4 channels on pin 6, 8, 12, and 10. And, C7 through C10 serves to increase the low-frequency stability better before going to the speaker.
The switch S1 is the mute button. By pressing S1 will be closed sound system circuit in Mute mode. But if Release the switch S1 standby ready to work.
The C5 and C6 will filter light to smooth out and eliminate interference.
Stereo amplifier 22 watts using TDA1554
This circuit has a moderate wattage, 22 watts + 22 watts. It is perfect for listening at home or in any car.
Also, it is a simple circuit, Use small pieces of equipment.
And more importantly, it uses only one IC, TDA1554Q. Inside it has a short-circuit protection circuit with the output.
How it works
See in the circuit. Here is the principle of the circuit.
22W+22W Stereo Power Amplifier with Single Chip TDA1554
The circuit will receive an input signal on each channel through C1 and C2. They will be signal coupling or filter a just AC signal only.
And the left channel input signal works the same as the right channel.
So, I explained just left alone.
The signal via from C1 to the pin1 and pin 2 of IC1.
Which the pin1 is position of non-inverter input. It will amplify the signal in no reverse phase to output pin 6.
And, pin 2 is inverting input in reverse phase to output pin 8.
Which it will be seen that both outputs pin 6 and Pin 8 are phase signals the opposite. So it will provide power increases itself.
Power consumption in use max up about 5 A at 12V. The speaker will be a 4-ohm speaker. So the power of sound is 22 watts.
But if you use any 8-ohms speaker. The power is lower.
While the circuit works. The IC will generate heat up. So, you should enough heatsink.
TA8225 BTL Amplifiers circuit
TA8225’s PCB. But I not have it. Thus I search on internet. The TA8225 is BTL audio power amplifier for consumer application. It is designed for 45W high power, low distortion, and low noise. It contains various kinds of protectors and the function of stand by SW.
The circuit diagram of TA8225
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In addition, the functions of output short or overvoltage detection and junction temperature are involved.
- Operating supply voltage: VCC = 9~18V
- High power output 45W at VCC=14.4V,F=1KHz,THD=10%,RL = 2 ohms)
- Low distortion ratio : THD = 0.015%(typ) VCC = 13.2V,f=1kHz,Pout = 4W,RL=4 ohms.
- Built-in stand by function with pin(1) set at high, power is turned on)
- Built-in output short or over-voltage, detection circuit, output to VCC, and output to GND short. (Pin(8): Open collector)
- Built-in junction temperature detection circuit. (Pin(2): Open collector)
- Built-in various protection circuits :
- Thermal shut down, Overvoltage
- Output to GND short
- The Output VCC short
- The Output to Output short.
Pins operation of TA8225
Here are a few related circuits you may find helpful, too:
- LM1875 Datasheet 30W HiFi audio amplifier circuit
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18 W BTL Audio Power Amplifier
If you are looking for a nice amplifier for your private room. There are a lot of choices for you. A transistor is good, but the IC also well. Today I suggest you try to test HA13118. It is 18 W BTL Audio Power Amplifier for Hitachi. I like the AC motor for Hitachi. It is very durable. Good quality, even a brand from Japan. Of course, an audio IC is the same.
Why should use it
The HA13118 is a class AB amplifier integrated circuit. Hitachi designs them for component car stereo amplifiers. At the power supply voltage of 13.2V and 4 Ω load speaker.
This power IC provides an output power of 18W with 10% distortion. In general, we use it in the bridge amplifier in a car. They have basic features as follows.
- You can use it anywhere. Because It requires a wide voltage supply of 8V to 18V in single voltage. At the current of 1A to 2A.
- Output current Io (peak) 4 A
- Power dissipation PT 15 W
- But max voltage is 26V
- Typical gain rates up to 55 dB.
- Less than 0.2% distortion at 1W
- Response frequencies from 30 Hz-30 kHz.
- Operating temperature –30 to +80 °C
- Small outline package, easy to mount
- Internal each protection circuits
- Surge protection circuit
- Thermal shut-down circuit
- The ground fault protection circuit
- Power supply fault protection circuit
How does it work
See in the circuit above.
Enter a power supply circuit, 12V. And then, enter an audio signal into the input. The signal flows through VR1. To adjust the level of the audio signal. Next, the C1 passeses the coupling signal to the input of IC1. And, the C2 eliminate the noises. After that, the audio signal gets into pin 3 of IC1. This is a bridge amplifier form(BTL). If you love Car amplifier circuit. You always see the BTL amplifier. Because it gives high power in the same voltage. See circuit inside the IC has Left and right channel. We connect both amplifiers together. To increase more power wattage. We can observe from the pin 15(left channel) connects one wire of the speaker. And pin 8(right channel) connects to another wire of the same speaker. Which the C7 and C8 will feedback a signal to be frequency response better. And, The C9, C10, R1, and R2 will reduce the noise signal. We hear a lower annoying hum in the background of power amplifiers. Because we add C11 and C12. If you increase C12-2200uF electrolytic more. It will reduce the ripple voltage of the voltage power supply.
Parts you will need
IC1: HA13118 18 W BTL Audio Power Amplifier
R1, R2: 2.2ohms 0.25W resistor
VR1: Potentiometer 10K
C1: 2.2uF 50V
C3, C4, C6, C7, C8: 100uF 25V
C5: 10uF 50V
C12: 2,200uF 25V
C2: 100pF 50V
C9, C10, C11: 0.1uF 50V
Speaker 4 to 8 ohms
Power supply 8V to 18V at 2A.
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