Here i propose a project of an AB class power amplifier, at its simplest, assembled with common compoments (not very expensive), based on traditional diagrams : a symmetrical differential input stage, a cascode stage driver and a MOSFET output stage.
The printed circuit is very compact, and consists of two sub-groups: the floor of command and the output stage. Les résistances sont toutes des 1/4 de watt 1 % métalfilm (sauf mention contraire). Resistors are all 1 / 4 of 1% métalfilm watt (unless otherwise indicated).The printed circuit board is very compact , and is composed of two subsets : the command stage and the output stage. The printed circuit board is very compact and is composed of two subsets: the command stage and the output stage. All resistors are 1/4 watt 1 % metal film (except if otherwise stated). All resistors are 1 / 4 watt 1% metal film (except if otherwise stated).
Les sources de courant de +/- 1 mA sont réalisées autour de T5 et T6. The current sources of + / – 1 mA are carried out around T5 and T6. Les diodes D1 à D6 permettent l’utilisation de transistors à faible bruit de type BC550C et BC560C, les transistors T7 à T10 forment l’étage driver. The D6 diodes D1 to allow the use of transistors with low noise and BC560C type BC550C, transistors T7 to form the floor T10 driver. Le potentiomètre P1 permet le réglage du courant de repos à 100 mA par transistor de sortie. The P1 knob allows adjustment of quiescent current of 100 mA per transistor output.
Constant current sources of +/- 1 mA are carried out around T5 and T6. Constant current sources of + / – 1 mA are carried out around T5 and T6. The diodes D1 to D6 allow the use of low noise transistors type BC550C and BC560C, the transistors T7 to T10 form the stage driver. The D6 diodes D1 to allow the use of low noise transistors type BC550C and BC560C, the transistors T7 to T10 form the stage driver. The potentiometer P1 allows the adjustment of the quiescient current to 100 mA per output transistor. The potentiometer P1 allows the adjustment of the quiescient current to 100 mA output per transistor.
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L’alimentation symétrique est confiée à un gros transformateur de 625 VA, 2 * 51 volts + pont redresseur et 6 condensateurs de 4700 µF, qui procure une tension de sortie de + et – 70 volts par rail. The symmetrical power is entrusted to a major transformer of 625 VA, 2 * 51 volts + bridge rectifier and 6 capacitors 4700 μ F, which provides an output voltage of + and – 70-volt rail.
The symmetrical power supply is entrusted to a large transformer of 625 VA, 2 * 51 volts + bridge rectifier and 6 reservoir capacitors of 4700 µF, which gives an output voltage of + and – 70 volts per rail. The symmetrical power supply is entrusted to a large transformer of 625 VA, 2 * 51 volts + bridge rectifier and 6 reservoir capacitors of 4700 μ F, which gives an output voltage of + and – 70 volts per rail.
La puissance de sortie est de 200 Wrms sous 8 Ohms ou de 350 Wrms sous 4 Ohms. The power output is 200 Wrms under 8 Ohms or 350 Wrms in 4 Ohms. La distorsion est inférieure à 0,02 %, le facteur d’amortissement est supérieur à 300, le rapport signal/bruit est de 112 db (pondéré A à pleine puissance), la sensibilité d’entrée est de 1,2 volts (200 W / 8 ohms). The distortion is less than 0.02%, the damping is higher than 300, the signal to noise ratio is 112 dB (A-weighted at full power), the input sensitivity is 1.2 volts (200 W / 8 ohms).
The output power is 200 Wrms under 8 ohms or 350 Wrms under 4 ohms. The output power is 200 Wrms under 8 ohms or 350 Wrms under 4 ohms. Distortion is lower than 0,02 %, damping factor is better than 300, signal-noise ratio is 112 db (balanced A at full power), the input sensitivity is 1,2 volts (200 W under 8 ohms). Distortion is lower than 0.02%, damping factor is better than 300, signal-noise ratio is 112 dB (A balanced at full power), the input sensitivity is 1.2 volts (200 W under 8 ohms).
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