Amplifiers which run from 12V DC generally don’t put out much power and they are usually not hifi as well. But this little stereo amplifier ticks the power and low distortion boxes. With a 14.4V supply, it will deliver 20 watts per channel into 4-ohm loads at clipping while harmonic distortion at lower power levels is typically less than 0.03%.

This is an ideal project for anyone wanting a compact stereo amplifier that can run from a 12V battery. It could be just the ticket for buskers who want a small but gutsy amplifier which will run from an SLA battery or it could used anywhere that 12V DC is available – in cars, recreational vehicles, remote houses with 12V DC power or where ever.
Because it runs from DC, it will be an ideal beginner’s or schoolie’s project, with no 240VAC power supply to worry about. You can run it from a 12V battery or a DC plugpack. But while it may be compact and simple to build, there is no need to apologise for “just average” performance. In listening tests from a range of compact discs, we were very impressed with the sound quality.

Long-time readers might recall that we presented a similar 12V power amplifier design back in May 2001. It was a similar configuration to this one but it is now completely over-shadowed by the much lower distortion and greatly improved signal-to-noise ratio of this new design. In fact, let’s be honest: the previous unit is not a patch on this new design. It used two TDA1519A ICs which resulted in distortion figures above 1% virtually across the board and a signal-to-noise ratio of only -69dB unweighted.
However, by using the TDA­7377 power amplifier IC and making some other improvements, the THD (total harmonic distortion) of the new design is about 50 times better than the older unit (see performance graphs for details). The bottom line is that the THD under typical conditions is around just 0.03% or less. It is also able to deliver more output power due to the improved output transistors in the new power amplifier IC.

In addition, its idle power consumption is low – not much more than 1W. As a result, if you don’t push it too hard it will run cool and won’t drain the battery too quickly. And because the IC has self-protection circuitry, it’s just about indestructible. It will self-limit or shut down if it overheats and the outputs are deactivated if they are shorted.Circuit diagram:
With a 12V supply, the largest voltage swing a conventional solid-state power amplifier can generate is ±6V. This results in a meagre 4.5W RMS into 4O and 2.25W RMS into 8O, without considering losses in the output transistors. Even if the DC supply is around 14.4V (the maximum that can normally be expected from a 12V car battery), that only brings the power figures up to 6.48W and 3.24W for 4O and 8O loads respectively – still not really enough.

There are three common solutions to this problem. The first is to boost the supply voltage using a switchmode DC converter. This greatly increases the cost and complexity of the amplifier but it is one way of getting a lot of power from a 12V supply. However, we wanted to keep this project simple and that rules out this technique.Parts layout:
There are variations on the boosting method, such as the class H architecture used in the TDA1562Q IC featured in the Portapal PA Amplifier (SILICON CHIP, February 2003). It is able to achieve 40W/channel but with >0.1% THD. In that case, the amplifier output itself provides the switching for a charge pump. The second method is to lower the speaker impedance. Some car speakers have an impedance as low as 2O, which allows twice as much power to be delivered at the same supply voltage. However, we don’t want to restrict this amplifier to 2O loudspeakers.

200W Audio Amplifier with Mosfet BUZ905P-BUZ900P

This project is develop from the MOSFET Power amplifier 100W that posted which it take to use in many activity such as Guitar amp,Mic,or Home theater and you will be to apply it.
As many people prefer because of its robustness MOSFET legendary. Altronics had a MOSFET amplifier with 200W, the product in a 4Ω, and we have decided to take a look at is.
It turns out that on the basis of the Pro One “, as described above, even if this version of Altronics and to the various MOSFETs. He has a rated output of 140W to 200W into 4Ω and 8W. Frequency range of 1 dB 20Hz up to 80kHz (Fig. 1). THD is less than 0.1% at full power (Fig. 2) and signal to noise ratio when compared to 200W is better than -100 dB unweighted.
Performance of the prototype
Output power (RMS ):… 140W into 8 ohms, 200W into 4 ohms
Frequency Response:. 20Hz – 80kHz-1dB points (see Figure 1)
Input sensitivity: ………… 830mV for 200W into 4 ohms
Distortion: … <0.1% (20 Hz – 20 kHz) (see Fig.2)
Signal-to-Noise Ratio:. > 102dB unweighted, 105dB A-weighted with respect to 200W into 4 ohms
Stability :…………………….. Unconditional
Originally, the “Pro Series One” was developed by Hitachi MOSFET A-3 metal containers. They are no longer available, and their counterparts from plastics are very difficult to obtain. Altronics on this situation and have essentially the same circuits designed for Plastic MOSFET corresponds Exicon by the United Kingdom. This required a re-design of the computer, so that all MOSFET and the pilot for all transistors on a plate are vertically mounted on the radiator.
Besides the use of plastic in the power transistors, which greatly simplifies the assembly of the metal in comparison with A-3 power transistors, have Altronics spring clips in the proximity of the pairs of transistors, so things were still simple. The spring clips, just what the voltage for transistors and there is no harm in a transistor due to struggle more screws.
The heat sink is a black anodized aluminum extrusion with fins on one side. It measures 300 mm long and has a lid that a 80mm fan cooled 24V DC. The fan runs constantly, which means that the radiator is always cool (or at least slightly above the ambient temperature).

100W Audio Amplifer Circuit With MOSFET IRFP240

MOSFET amplifier with MOSFET for your build in electronic hobby.
I would like to show you here a basic MOSFET amplifier or power Amp which Output power is plus/minus 100 Watt/RMS with
8 Ohms or ohter plus/minus 160 Watts /RMS with 4 ohms.
Regarding this circuit simplicity, The distortion is plus/minus 0.1 %.
For band-width -3 db(decibel) is gain for 4 Hz to 96 Khz, it is limited by C1, R1, C2 and R2.
In the two transistors are T1 and T2 makes a first differential stage part, So,current source(I) of +/- one mA is set with resistor R3.

For the upgraded project, The current source(I) is more efficient in stability. Coil P1 allows a fine tuning of direct current voltage at amplifier’s output. Place the Coil P1 with it’s half value for first power up, then turn it slowly for a lowest DC output voltage. Use a first quality compoment.
Electronic Part
C1 = 2,2 µF MKP, MKT 100 V
C2 = 330 pF céramique 50 V
C3 = 100 nF MKP, MKT 100 V
C4 = 100 µF 40 V électro-chimique
C5, C6 = 18 pF céramique 50 V
C7 = 100 nF MKP, MKT 250 V  (C8 = 47 µF 100 V)
R1, R3 = 47 K   (R3 = 330 -> 470 Ohms)
R2 = 2K2
R4, R5 = 3K9
R6 = 1 K
R7 = 27 K
R8, R9, R11 = 100 ohms
R10 = 10 K
R12, R13 = 470 ohms
R14, R15 = 0.33 ohms 5 watts
R16 = 10 ohms 3 watts      (R17 = 1 K    R18, R19 = 10K)
T1, T2, T9,T10 = 2SD756A,2SD716A, BC556B (attention au brochage différent – take care for pin layout)
T7 = IRFP240, 2SK1530, 2SJ162, BUZ900DP, BUZ901DP (attention au brochage different – take care for pin layout : GDS GSD)P1 = 100 ohms  (25 tours – 25 turns)

230W Audio Amplifer Circuit With MOSFET IRFP240,9240

230 W MOSFET Audio Amplifer Circuit Here is simple LED-power audio amplifier circuit with MOSFET amplifier TL071C and 2 may be up to 45 W into 8 ohms.

800 Watt Audio Amplifer circuit with MOSFET

800W audio amplifier circuit
The audio power amplifier ideal for home user or PA work or for use as a general-purpose subwoofer or hi-fi amplifier. There are many people like to prefer MOSFET as their legendary ruggedness.
This circuit project had the Mosfet amplifier module which produced 800 Watt  into 4 Ohm speaker load and so we decided to take a look it.
It was turned out to be based on the “Pro Series One” as mentioned above, although this version by Altronics has had derated and adapted to different MOSFET. It has a  power output rate with 700W into 8W and 800W into 4 Ohm. For frequency response is within 1dB from 20Hz to 80kHz. Total harmonic distortion is rated at less than 0.1% up to full power and signal-to-noise ratio with respect to 800W is better than 100dB unweighted.
For circuit using MOSFET number BUZ902DP ,BUZ907DP which is popula take to build amplifer, If you see the circuit ,It seen 2 same circuits in the project which one circuit can gen power output at 400 Watt.

1000W MOSFET Audio Amplifier Circuit

Welcome to Hobby Electronics ,Today i’m still present the audio amplifier circuit ,I like the supper amplifier .
So,I would like to show you the 1000Watts  MOSFET amplifier circuit for your build sound system.
Click the picture left side to open the Circuit in PDF file.
I include full schemaatic chart and film; pattern of the 1000-watt amplifier and a step by step instructions for setting the construction of the amplifier is a true full 1000 watts per channel.
 I have been building and playing very well goood can drive a 18 Bring with inch subwoofer dual magnet high performance at UA smooth clear and crisp sound that I used for outdoor event and mobile services when building you will, said this amp I can only contact me gave my email Mail on how to get this project … I assure you his powerful …. You could, but I have to return it a full program of 20 band equalizer can be difficult to find on the net …