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Enlarge Ear Monitoring Circuit Introduction

2015-01-24 02:17  
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This article is about an enlarged ear monitoring circuit brief. Before you look at the diagram, I will first introduce you to one of the circuit's two core components: NE5532 and LM1877 .
NE5532  Description: The NE5532 is high-performance operational amplifiers combining excellent dc and ac characteristics. They feature very low noise, high output-drive capability, high unity-gain and maximum-output-swing bandwidths, low distortion, high slew rate, input-protection diodes, and output short-circuit protection. These operational amplifiers are compensated internally for unity-gain operation. These devices have specified maximum limits for equivalent input noise voltage.
NE5532 features:
· Equivalent input noise voltage: 5 nv / √ hz typ at 1 khz
· Unity-gain bandwidth: 10 mhz typ
· Common-mode rejection ratio: 100 db typ
· High dc voltage gain: 100 v / mv typ
· Peak-to-peak output voltage swing 26 v typ with vcc ± = ± 15 v and rl = 600 ω
· High slew rate: 9 v / ms typ
LM1877 Description: The LM1877 is a monolithic dual power amplifier designed to deliver 2W/channel continuous into 8W loads. The LM1877 is designed to operate with a low number of external components, and still provide flexibility for use in stereo phonographs, tape recorders and AM-FM stereo receivers, etc.Each power amplifier is biased from a common internal regulator to provide high power supply rejection, and output Q point centering. The LM1877 is internally compensated for all gains greater than 10.
LM1877 features:
· 2W/channel
· -65 DB ripple rejection, output referred
· -65 DB channel separation, output referred
· Wide supply range, 6V-24V
· Very low cross-over distortion
· Low audio band noise
· AC short circuit protected
· Internal thermal shutdown
Complete understanding of these two components of the basic information, I hope to help you understand the circuit diagram.
 

schematic th  Amplified ear for surveillance

Amplified ear for surveillance