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tone control preamplifier
tone control preamplifier
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Old 5th March 2020, 01:10 AM   #1
andrewlebon is offline andrewlebon  India
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Default tone control preamplifier

Hello
greetings can anyone help me out i am trying to make this simple
tone control as i am not a pcb designer can this tone control be
made on a double sided pcb with lots of ground plane and SMD
components.I have made it on a dot pcb with LM4562 can it be bettered
with OPA1612 IC . Sorry for asking so many questions
warm regards
Andrew
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Old 5th March 2020, 08:26 AM   #2
Mark Tillotson is offline Mark Tillotson
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Bipolar tone control opamps and no DC blocking capacitors on the wipers - it will be crackly.


Any DC on the wiper will cause loud crackles if the pot isn't perfect as the current is interrupted over bumps on the track and the input stage briefly saturates full-swing.

This is why JFET opamps are commonly used for tone-controls, or DC-blocking caps and separate DC bias paths.
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Old 18th March 2020, 07:38 AM   #3
andrewlebon is offline andrewlebon  India
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OPA2156: HiFi in CMOS



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Old 31st March 2020, 01:43 PM   #4
andrewlebon is offline andrewlebon  India
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Default Hello

Hello
greetings any suggestions how to improve the layout of this tone control
i will add APEX audio Aclass power supply to it and tone defeat switch
warm regards
Andrew
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