25W Audio Power Amplifier Rise
Friday, April 12, 2013 | Labels: 25w, amplifier, audio, power, rise | |This audio energy amplifier undertaking is based on LM1875 amplifier module from National Semiconductor. It can deliver as so much as 30W of energy the utilization of an 8 ohm load & twin 30V DC power provides. It is designed to operate with most outdoor parts with current limit & thermal shutdown protection features . Other features include high achieve, fast slew charge, huge energy provide vary, giant output voltage swing & high present functionality.
Summary of the audio amply-fire options:
Summary of the audio amply-fire options:
- Low distortion: 0.015%, 1 kHz, 20 W
- Wide power bandwidth: 70 kHz
- Wide supply range 16V-60V
- Up to 30 watts output energy
- Internal output safety diodes
- Protection for AC & DC brief circuits to floor
- 94 dB ripple rejection
- Plastic energy bundle TO-220
25V Power Supply
The schematic beneath shows how the +25V DC & -25V DC are acquired. In order to provide power provide for two stereo amplifiers, a power transformer score of 80VA with 240V/36V middle tapped secondary winding is used. The secondary output of the transformer is rectified by using 1N5401 diodes along side four electrolytic capacitors to smoother the ripple voltage. A fuse & a varistor are related at the major enter to give protection to the circuit once morest energy surge.
The schematic beneath shows how the +25V DC & -25V DC are acquired. In order to provide power provide for two stereo amplifiers, a power transformer score of 80VA with 240V/36V middle tapped secondary winding is used. The secondary output of the transformer is rectified by using 1N5401 diodes along side four electrolytic capacitors to smoother the ripple voltage. A fuse & a varistor are related at the major enter to give protection to the circuit once morest energy surge.
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Audio Amplifier Module
The +25V & -25V DC power provide are related to the audio amplifier module thru a 2A fuse with the peripheral tools shown in the schematic under. The audio enter signal to be amplified is coupled to pin one among LM1875 throughout the resistor R1 and electrolytic capacitor E5.
The +25V & -25V DC power provide are related to the audio amplifier module thru a 2A fuse with the peripheral tools shown in the schematic under. The audio enter signal to be amplified is coupled to pin one among LM1875 throughout the resistor R1 and electrolytic capacitor E5.
The output sign at pin four of LM1875 can be utilized to immediately drive a eight ohm loudspeaker. Resistor R6 and capacitor C5 prevent-the capacitance developed on the lengthy speaker leads from riding the amplifier in to High Frequency Oscillation.
A heat-sink with a thermal resistance ranking of one.4 Cecilius/Watt or better should be used or else the amplifier module will-be cut-off from operation because of the heat in an effort to build up in the directionwork of the operation of the amplifier. Take note that the warmth sink tab on the IC module is internally related to the -25V power supply hence it must be remoted from the warmth sink by the use of an insulating washer. If this isn't finished, the negative rail shall be briefed to ground.
A heat-sink with a thermal resistance ranking of one.4 Cecilius/Watt or better should be used or else the amplifier module will-be cut-off from operation because of the heat in an effort to build up in the directionwork of the operation of the amplifier. Take note that the warmth sink tab on the IC module is internally related to the -25V power supply hence it must be remoted from the warmth sink by the use of an insulating washer. If this isn't finished, the negative rail shall be briefed to ground.
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