Project: "Monoblocus" hi-end power amplifier (Revision 1)

Discussion in 'The Completed Projects Collection' started by cumesoftware, Jun 11, 2012.

  1. cumesoftware

    Thread Starter Senior Member

    Apr 27, 2007
    1,330
    10
    List of components:
    C1/4 – 10mF electrolytic capacitor (50V);
    C2/5/7 – 100µF electrolytic capacitor (50V);
    C3/6/11 – 100nF polyester capacitor (63V);
    C8 – 1µF polyester capacitor (63V);
    C9 – 220pF ceramic capacitor (63V);
    C10 – 100µF non-polarized electrolytic capacitor (6,3V);
    D1/2 - 1N4005 rectifier diode;
    D3-6 – 1N5400 rectifier diode;
    D7/8 - 1N4001 rectifier diode;
    F1 – 1A slow-blow fuse;
    F2/3 - 3.15A slow-blow fuse;
    HS – 1.2°C/W passive heatsink;
    IC1 - TLP521-1 optocoupler;
    IC2 – LM3876 audio power amplifier (LM3876TF);
    J1 – IEC C14 connector;
    J2 – RCA female connector;
    JW – 26AWG stranded wire;
    L - Air core coil, 16 turns with 6mm dia. of 22 AWG wire;
    LP – 230V~ resistored neon bulb;
    R1 – 1.2KR carbon resistor (5% tol., 1W);
    R2/6 – 33KR carbon resistor (5% tol., 1/8W);
    R3 – 12KR carbon resistor (5% tol., 1/8W);
    R4 – 47KR carbon resistor (5% tol., 1/8W);
    R5/7 – 1KR carbon resistor (5% tol., 1/8W);
    R8 – 4,7R carbon resistor (5% tol., 1W);
    R9 – 10R carbon resistor (5% tol., 1/2W);
    S – DPST switch;
    T – Toroidal transformer 230V~ pri. 2x18V~ sec. 120VA.

    Electrical parameters:
    - Va min = 207V RMS
    - Va max = 253V RMS
    - Ia (Va = 230V RMS, Z = 4Ohm) = 496.4mA RMS
    - Ia (Va = 230V RMS, Z = 8Ohm) = 343.9mA RMS
    - P (Va = 230V RMS, Z = 4Ohm) = 114.2W
    - P (Va = 230V RMS, Z = 8Ohm) = 79.10W

    Amplification characteristics:
    - Input impedance: 9.559KOhm
    - Input sensitivity: 500mV RMS
    - Gain: 30,63dB (34V/V)
    - Frequency response (-3dB): 12.91-120000Hz
    - Output power (Z = 4Ohm): 45W
    - Output power (Z = 8Ohm): 29W
     
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