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Scheme de amplificatoare audio

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Amplificator audio cu MOSFET 300W in 4 Ohmi (tensiunea tipica de alimentare intre +/-50Vcc si +/-60Vcc):



Observatie importanta: Daca doriti sa utilizati montajul alimentat la peste +/-60Vcc atunci inlocuiti BC640 cu 2N5401 sau 2SA1085E si BC639 cu MPSA42 sau MJE340.

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Stimati electroforumisti, am mai gasit doua scheme interesante de amplificatoare audio:



si inca una:




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Aici aveti schema amplificatorului postat pentru discutii de catre mine UN AMPLIFICATOR SIMPLU !





This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality.

The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback configuration but can deliver more than 18W into 8 Ohm with <0.08% THD @ 1KHz at the onset of clipping (0.04% @ 1W - 1KHz and 0.02% @ 1W - 10KHz) and up to 30W into a 4 Ohm load.

To obtain such a performance and to ensure overall stability of this very simple circuitry, a suitable regulated dc power supply is mandatory. This is not a snag because it also helps in keeping noise and hum of the preamp to very low levels and guarantees a predictable output power into different load impedances. Finally, as the amplifier requires only a single rail supply, a very good dc voltage regulator capable of supplying more than 2 Amps @ 40V can be implemented with a few parts also.


Power Amplifier Parts:


R1_______________2K2 1/4W Resistor

R2______________27K 1/4W Resistor

R3,R4____________2K2 1/2W Trimmers Cermet or Carbon (or 2K)

R5_____________100R 1/4W Resistor

R6_______________1K 1/4W Resistor

R7,R8__________330R 1/4W Resistors


C1______________22µF 25V Electrolytic Capacitor

C2______________47pF 63V Polystyrene or Ceramic Capacitor

C3,C4__________100µF 50V Electrolytic Capacitors

C5____________2200µF 50V Electrolytic Capacitor


Q1____________BC550C 45V 100mA Low noise High gain NPN Transistor

Q2___________IRF530 100V 14A N-Channel Hexfet Transistor (or MTP12N10)

Q3__________IRF9530 100V 12A P-Channel Hexfet Transistor (or MTP12P10)

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Un alt amplificator audio interesant il gasiti AICI

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Amplificatoare audio Hi-Fi in clasa A:


1. Aleph 1.2:



2. Aleph 2:



3. Aleph 3:



4. Aleph 4:



5. Aleph 5:



6. Aleph M:



7. Aleph X:



Amplificatoare audio ZEN Hi-Fi in clasa A:









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Postez si aici o schema simpla si performanta de amplificator audio (LM-ul se poate inlocui cu un AO uzual cu circuitele de alimentare cu dioda Zener atasate). In anumite siutatii este necesar si un preamplificator audio.


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