We want to implement 100V Audio Line in one of my project.The path is like this
Audio CODEC or Microphone Audio --->Preamplifier---->Audio Power Amplifier --->Step up transformer-->Distribution network-->Step Down Transformer(which is at loudspeakers) --->Loud Speakers (Each- 6W RMS,8Ω).
Maximum No of speakers : 8 Nos.
Impedance of spekers:8Ω
Maximum Wattage of each Speaker: 6W,RMS.
Power Amplifier wattage - 6W,RMS x 8 -->48W RMS.
We selected LM4780 as a power amplifier and using single output channel of 60W with DC Supply of ±35V Output at 8Ω load impedance.
We did the calculations for the step-up transformer and we ordered.I need Power supply specifications for generation of ±35V DC for LM4780.Supply Current was only given as spec in LM4780 datasheet.
Shall I need to take the loudspeakers,step-up transformers/Step-down current calculations into consideration or not?
Please give calculation regarding Output Current for the Power supply required?
Suneetha.V
Audio CODEC or Microphone Audio --->Preamplifier---->Audio Power Amplifier --->Step up transformer-->Distribution network-->Step Down Transformer(which is at loudspeakers) --->Loud Speakers (Each- 6W RMS,8Ω).
Maximum No of speakers : 8 Nos.
Impedance of spekers:8Ω
Maximum Wattage of each Speaker: 6W,RMS.
Power Amplifier wattage - 6W,RMS x 8 -->48W RMS.
We selected LM4780 as a power amplifier and using single output channel of 60W with DC Supply of ±35V Output at 8Ω load impedance.
We did the calculations for the step-up transformer and we ordered.I need Power supply specifications for generation of ±35V DC for LM4780.Supply Current was only given as spec in LM4780 datasheet.
Shall I need to take the loudspeakers,step-up transformers/Step-down current calculations into consideration or not?
Please give calculation regarding Output Current for the Power supply required?
Suneetha.V
This thread is in the wrong forum (this is Forum problems) - can a mod please move it?
To your question: since the load your amp will see is 8 ohms, you can size your transformer assuming you want +/- 35V which will give about 32V peak at the load which is 4A peak, or 2.8A RMS / 22.5V RMS in 8 ohms which is about 65 W per channel.
A 200 to 300 VA transformer for stereo would be fine, you'need about 24VAC.
Jan
To your question: since the load your amp will see is 8 ohms, you can size your transformer assuming you want +/- 35V which will give about 32V peak at the load which is 4A peak, or 2.8A RMS / 22.5V RMS in 8 ohms which is about 65 W per channel.
A 200 to 300 VA transformer for stereo would be fine, you'need about 24VAC.
Jan
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