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NAKSA 80


N80plan1

The NAKSA 80 is a solid state, Class AB stereo power amplifier module of unusual design delivering 80 watts RMS into an 8 ohm load using a 300VA 30-0-30Vac power transformer.  The NAKSA 80 is a fully built and tested stereo amplifier module. For domestic use, the user connects the two secondaries of a suitable transformer (not supplied), the signal inputs, earth wire, and the speaker outputs. The entire stereo amplifier, including all power supply circuitry, is built onto a single high quality, double-sided circuit board of 280mm x 70mm mounted on a cast Conrad MF30-75 heatsink.

The NAKSA 80 has evolved from the very successful NAKSA 70, though with different topologies. The use of surface mount components permit a compact, neat layout. Topology enhancements include a new voltage amplification stage, improved offset control, radical output stage drive and bias control. Two robust complementary Mosfet output devices per channel are used.  Other details are indicator LEDs, a bipolar power output connector for powering accessories, a chassis earth lift, and high quality, insulated fuse holders. The amplifier can be used immediately out of the package with all settings factory adjusted.
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The NAKSA 80 exhibits almost eerie silence. The sound quality gives extraordinary low frequency grip, startling dynamics, crystalline clarity, and resolution to better many Class A amplifiers. NAKSA 80 Specifications are:

• Maximum power: 80 watts into 8 ohms, or 120 watts into 4 ohms
• Distortion at 1 watt (1KHz, 8ohms): 0.06%
• Distortion at 12.5 watts (20dB, 1KHz, 8ohms): 0.06%
• Frequency Response (at 12.5 watts into 8 ohms):
o 1dB down at 10 Hz,
o 1dB down at 150 KHz.
• Input impedance: 26 Kohms
• Gain: 26 (or 28.3dB)
• Input sensitivity: 972mV RMS for 80 watts into 8 ohms.
• Output stage bias: Adjust to between 100mA to 120mA (invariant hot or cold).
• Output Offset: Adjust to less than 10mV when warm.
• Circuit Board Size: 280mm by 70mm, 2mm FR4, two layers, 70um copper clad.
• Heatsink: Conrad MF30-75, 300mm by 75mm (or case alone if used)
• Fuses: 10 Amp, 20mm by 5mm, slow blow
• Transformer: 300VA toroid with two 30 Vac secondary windings (not supplied)
• Amplifier rail voltage: Do not exceed 45 volts (42 volts recommended)
• Mains fuse: A 5 Amp mains fuse is recommended for 230 Volt AC.

The NAKSA 80 product shipment includes:
• A fully assembled circuit board module containing an integrated power supply (rectifiers, filter capacitors and fuses), and two amplifiers.
• 300mm by 75mm Conrad MF30-75 heatsink, machined and tapped, with the NAKSA 80 module attached. Alternatively, the NAKSA 80 module can be supplied mounted in a custom designed 3mm thick Aluminium chassis, which acts as the heatsink, at an additional cost.
• Two RCA input connectors (one Red, one Black).
• Coaxial input cable.
• Two speaker `hot’ leads with integral 1uH inductor.
• Two speaker `cold’ leads.
• Front panel power indicator Green LED.
• Chassis ground wire.
• Four crimp spade connectors for the transformer secondary connections.
• Heatshrink tubing.
• Detailed build instructions, and Email support.


Sole Contact:
Aspen Amplifiers Pty Ltd
55 Grove Road, Rosanna
Australia, 3084
Phone: (613) 9457-5591
Aspen01@optusnet.com.au
www.aksaonline.com
Copyright , Aspen Amplifiers Pty Ltd, 2012,2013