AudioAmp380

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AudioAmp380-3D.png

Design

  • Pre-amp plus power amp
  • 50 Ohm input impedance
  • External mount gain potentiometer
    • Gain potentiometer on preamp
  • LM380 2.5W Audio Power Amplifier
    • Wide Supply Voltage Range: 10V-22V
    • Low Quiescent Power Drain: 0.13W (VS= 18V)
    • Voltage Gain Fixed at 50 (34 dB)
    • High Peak Current Capability: 1.3A
    • Input Referenced to GND
    • High Input Impedance: 150kΩ
    • Low Distortion
    • Quiescent Output Voltage is at One-Half of the Supply Voltage
  • NE5534 Pre-amplifier
    • Low-Noise Operational Amplifiers
    • Equivalent Input Noise Voltage 3.5 nV/√Hz Typ
    • Unity-Gain Bandwidth 10 MHz Typ
    • Common-Mode Rejection Ratio 100 dB Typ
    • Wide Supply-Voltage Range ±3 V to ±20 V
    • Used as single supply
  • Fits into 80x50x20mm extruded aluminum enclosure

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Schematic

AudioAmp380-Schematic.png

Rev 1 Rework

  • Front end opamp has + and - reversed
    • Also hooked up the feedback to the wrong input
  • 5 Cuts
    • 4 on front
    • 1 on back
  • 5 Jumpers on back

U2-2 3 Rev1 Rev2 Cuts Jumpers.png

Videos

ZL2CTM Schematic.PNG

Assembly Sheet

LM380 Rev 1 Assembly Sheet