Testing the MOSFET 500W amplifier. Measurements, specifications
| Testing device | Amplifier MOSFET 500W |
| Sampling mode | 24-bit, 48 kHz |
| Interface | E-MU1616m |
| Testing chain | E-MU1616m>Amplifier MOSFET 500W>E-MU1616m |
| Constant voltage DC | -73V...0...+73V |
| Load resistance | 4 Ohm |
| Testing power | 300W |
| Maximum power | 447W |
| Output transistors | IRFP250N |
| Quiescent current | 150mA |
| 20 Hz - 20 kHz filter | ON |
| Normalize amplitude | ON |
| Level change | -0.5 dB / -0.5 dB |
| Mono mode | ON |
| Calibration singal, Hz | 1000 |
| Polarity | correct/correct |
Summary
| Frequency response (from 40 Hz to 15 kHz), dB | +0.02, -0.14 |
Very good |
| Noise level, dB (A) | -112.3 |
Excellent |
| Dynamic range, dB (A) | 112.5 |
Excellent |
| THD, % | 0.034 |
Good |
| THD + Noise, dB (A) | -67.2 |
Average |
| IMD + Noise, % | 0.033 |
Good |
| IMD at 10 kHz, % | 0.144 |
Average |
| General performance | Good |
Frequency response
Left |
Right |
|
| From 20 Hz to 20 kHz, dB | -0.26, +0.02 |
-0.26, +0.02 |
| From 40 Hz to 15 kHz, dB | -0.14, +0.02 |
-0.14, +0.02 |
Noise level
Left |
Right |
|
| RMS power, dB | -107.3 |
-107.3 |
| RMS power (A-weighted), dB | -112.3 |
-112.3 |
| Peak level, dB FS | -79.9 |
-79.9 |
| DC offset, % | -0.0 |
-0.0 |
Dynamic range
Left |
Right |
|
| Dynamic range, dB | +107.8 |
+107.8 |
| Dynamic range (A-weighted), dB | +112.5 |
+112.5 |
| DC offset, % | +0.00 |
-0.00 |
THD + Noise (at -3 dB FS)
Left |
Right |
|
| THD, % | 0.03394 |
0.03394 |
| THD + Noise, % | 0.03497 |
0.03497 |
| THD + Noise (A-weighted), % | 0.04390 |
0.04390 |
Intermodulation distortion
Left |
Right |
|
| IMD + Noise, % | 0.03312 |
0.03312 |
| IMD + Noise (A-weighted), % | 0.02249 |
0.02249 |
IMD (swept tones)
Left |
Right |
|
| IMD + Noise at 5000 Hz, | 0.04673 |
0.04673 |
| IMD + Noise at 10000 Hz, | 0.08178 |
0.08178 |
| IMD + Noise at 15000 Hz, | 0.30437 |
0.30437 |
Maximum power
Calculation formula |
Meaning |
|
| Maximum power, W | (Vrms x Vrms) / 4 Ohm |
447 |
Conclusions
| A lot of time has passed since the advent and development of amplifiers based on powerful bipolar transistors.
During this time, the technology for manufacturing high-power field-effect transistors has also advanced a lot in
our lives, there are entire areas of consumer and industrial electronics that are simply not possible without
field-effect transistors. With the growth in the level and quality of powerful field (power) transistors, more and
more radio amateurs tried to use them in the output stages of their developments. As a result, these attempts were
successful, and the use of power field-effect transistors in amplifiers is found not only in home-made developments,
but also in industrial devices of a fairly high level.
Summary: The amplifier is built as a cheaper and very powerful version of the famous and much loved LANZAR amplifier. Moreover, despite certain disadvantages of field-effect transistors, they also have a number of advantages over field-effect transistors: 1. PT can withstand noticeably large impulse loads, or rather overloads. 2. The absence of input currents, in some cases, makes it possible to significantly simplify the swinging cascades. 3. The parameters are less dependent on temperature, besides they have a large linear section of the transfer characteristic. In addition, it should be noted that the amplifier is built on quasi-complementary IRFP250N transistors, since N-channel devices, due to production features, are better transistors compared to their P-channel counterparts, and this trend is observed even in complementary pairs. You can buy the module from our store kit-amp.com. The module is recommended for building a high-quality and powerful power amplifier, and as a more affordable alternative to the LANZAR amplifier based on bipolar output transistors. |
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