LM3886 Amplifier User Manual
Contents
1. LM3886 Power Amplifier User Manual ANALOG METRIC www analogmetric com sales analogmetric com Copyright 2009 All Rights Reserved LM3886 POWER AMPLIFIER USER MANUAL BNE lea adit INTRODUCTION This kit uses one LM3886 IC which high performance audio power amplifier capable of delivering 68W of continuous average power to a 40 load and 38W into 8 2 load with 0 1 THD N from 20Hz 20kHz Signal to Noise ratio is more than 92dB and ultra low noise floor which is 2uV FEATURES e Use LM3886 chip which is a high performance audio power amplifier e Continuous Average Output Power e 68W 4 Q Vec 28V e 38W 8 O Vec 28V e 50W 8 Q Vcc 35V e 135W instantaneous peak output power capacity e Voltage gain 22dB www analogmetric com Page 2 LM3886 POWER AMPLIFIER USER MANUAL Analog Metric Metric 0 1 THD N from 20Hz 20kHz Typical low noise floor 2uV Signal to Noise Ratio gt 92dB Output protection from a short to ground or to the supplies via internal current limiting circuitry Dedicated power and ground railings Shortest signal paths with minimum parasitic e Power requirement 20V 94V DC e PCB dimension 70mm x 37mm 2 4mm thickness and 20z copper PRECAUTIONS e Use a power transformer with fuse 5A socket to limit the supply current in case of short circuit or incorrect assembly e Double check the assembled components with the schematics e Turn off the power supply if you observe an2. ve any problem in assembly please contact us by email to www analogmetric com Page 5
3. y smokes or hear strange sound coming out from the transformer or board If there is short circuit the transformer will be getting very hot shortly PROCEDURES 1 Solder all the components according to the schematic BOM list and the photo Notice to the polarity of the capacitors CI C2 C3 C4 and diodes D1 and D2 There is no polarity of the thin capacitor 2 Apply power supply to the board according to the following photo It requires one 28V DC 5A and one 28V DC 5A The supply voltages can be ranged from 20V up to 94V 3 Measure the input and output voltage without any connections The voltages should be close to OV 4 Apply signal to the input and en joy it www analogmetric com Page 3 LM3886 POWER AMPLIFIER USER MANUAL Analog Metric Metric Ee LE WM JUN di om Sz ps Y O DST TINO S8 AOOVI MIldi adNy 3GLEN TU TESTING ch Cyc AMS vv VT Le prega A MUERTE L F Li 5 00 y www analogmetric com Page 4 LM3886 POWER AMPLIFIER USER MANUAL Analog Metric Metric 41 rr CHI 1 Pk Pk 22 8Y a CH L ta li i n i 19 96 kHz LL So erre NN ORNE Freg 0 0 Al STAR MER ars MI nga Ta y O Le hn ha hu ho CHI K i E h AS E 6 224 c CHI i PR PR 7 A By 7 Li rerttrereperererer IIRTIAI 111 e A rt 1 gt Li CHT 5 00 CHT 340mv ae 19 3999kH2 If you ha
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