In Ltspice I have a loudspeaker simulation, R and L as load.
Iam using a opamp for voltage amplification and then the buffer for current amplification. I want to drive Z=35Ω. My input signal is 0.5V from a line out.
But what is the terminal voltage? IS it the voltage on the input? On the output of the opamp, after the (voltage)amplification?
Iam using a opamp for voltage amplification and then the buffer for current amplification. I want to drive Z=35Ω. My input signal is 0.5V from a line out.
Have you looked at the data sheet? All your answers are there.
Page 6 - the graph "Bias Terminal Voltage" indicates that the bias terminal voltage varies from around 0.6 to 0.9 volts. So your bias current, using Ohm's law, would be Vcc - 0.75 (an approximation, you can find the right voltage from the graph) divided by your bias resistance.
If you read the text, it indicates that increasing the bias current results in better stability, and probably wider bandwidth too. This will run down batteries if it is battery operated. So you have to come up with that parameter.
What op amp are you going to use? I recommend 5532 for a beginner because it will be easier to build a stable circuit with a slower op amp. 5532 works great and sounds great in front of a properly configured headphone amp. If you want to use a faster op amp, read and understand the text in the datasheet if you can.
Page 6 - the graph "Bias Terminal Voltage" indicates that the bias terminal voltage varies from around 0.6 to 0.9 volts. So your bias current, using Ohm's law, would be Vcc - 0.75 (an approximation, you can find the right voltage from the graph) divided by your bias resistance.
If you read the text, it indicates that increasing the bias current results in better stability, and probably wider bandwidth too. This will run down batteries if it is battery operated. So you have to come up with that parameter.
What op amp are you going to use? I recommend 5532 for a beginner because it will be easier to build a stable circuit with a slower op amp. 5532 works great and sounds great in front of a properly configured headphone amp. If you want to use a faster op amp, read and understand the text in the datasheet if you can.
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