Hi,
I'm having trouble with my DC servo circuit attached to my current-feedback amplifier (40 Wrms maximum potency for a 8 ohm load). The thing is, the DC servo works perfectly removing de DC component in the output of my amplifier, but interferes with my ac signal output when i put a square wave at the entrance of the amplifier so i get maximum voltage peak at the output. I attach some images of my tests. The square wave deforms in one of the cycles, depending on the duty cycle of the entrance signal. For example, if the duty cycle is less than 50%, i get a deformation at the positive part of my signal. The exact reverse thing occurs when the duty cycle is greater than 50%. I'm starting to think this issue might be because the supply of my TL081 i use in the dc servo is lower than the entrance of the dc servo when the output it's at it's maximum peak voltage, but really don't know what is occurring. I attach as well the diagram of my circuit.
Thanks!
I'm having trouble with my DC servo circuit attached to my current-feedback amplifier (40 Wrms maximum potency for a 8 ohm load). The thing is, the DC servo works perfectly removing de DC component in the output of my amplifier, but interferes with my ac signal output when i put a square wave at the entrance of the amplifier so i get maximum voltage peak at the output. I attach some images of my tests. The square wave deforms in one of the cycles, depending on the duty cycle of the entrance signal. For example, if the duty cycle is less than 50%, i get a deformation at the positive part of my signal. The exact reverse thing occurs when the duty cycle is greater than 50%. I'm starting to think this issue might be because the supply of my TL081 i use in the dc servo is lower than the entrance of the dc servo when the output it's at it's maximum peak voltage, but really don't know what is occurring. I attach as well the diagram of my circuit.
Thanks!
First short out the DC servo and verify that the amplifier is working. If working then limit the input signal to the servo, diode clamp & or more integration (only VLF).
Duke
Duke
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