Power amplifier for Loudspeaker 6.5W 8R circuit


Posted on Feb 6, 2014

The amplifier of circuit, use negative current feedback. So, the load current depends mainly from the input signal and no so much from the impedance of loudspeaker. The inductor current of loudspeaker develop above in the R7 a voltage. This voltage is drive to the inverting input of IC1, creating thus negative feedback. Total voltage gain of circu


Power amplifier for Loudspeaker 6.5W 8R circuit
Click here to download the full size of the above Circuit.

it, it depend from the reason of impedance of loudspeaker H1 [ Zo ], to the price of R7. In the circuit the gain is (Zo+R7)/R7 that is to say (8+0. 5)/0. 5=17. The connection output of IC1 in the ground, is extraordinary, but in this way, the current of base of transistors Q1, Q2 is provided by the lines of supply and no by the IC1. The calm current of is 50 until 100mA, for operation in Class A and is determined by R2, R3, R5, R6. Transistors Q1-Q2, should be matching, so that are not created big current and voltage of deviation. May it will are change the resistors R2, R3, so that we achieve symmetry of bias. With complete drive, the current of emitter the Q1-Q2 is roughly 500mA. The THD is 0. 01% for output power, 6. 5W in 8R and voltage supply ± 18V. Elektor`87




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Digital Storage Oscilloscope Adapter
    Fuzz Face
    Comparator for over-voltages
    Instrumentation amplifier
    Automatic Tr Switch Circuit
    Drive an RGB led with software PWM
    Triangular Wave Generator Circuit
    Digital Clock Circuit with T89C51 microcontroller
    pic volt and amere meter circuits
    l297 stepper motor controller circuits
    Square Wave Generator
    digital step km counter with
    Schematics Low-Ripple Power Supply
    picsoft
    V3.0 MS Build With Pics
    Cool Electronics main page



    Top