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

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bloguetronica

Joined Apr 27, 2007
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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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