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Author Topic: How to control the output of a Current pump with the help of an audio DAC  (Read 5496 times)

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Offline Vovk_Z

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Re: How to control the output of a Current pump with the help of an audio DAC
« Reply #25 on: July 18, 2023, 06:39:18 pm »
And I don't see any capacitors in power lines.
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Offline ali_asadzadehTopic starter

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Re: How to control the output of a Current pump with the help of an audio DAC
« Reply #26 on: July 20, 2023, 07:56:41 am »
Quote
And I don't see any capacitors in power lines.
eagle eyes, the problem solved! thanks ^-^
How much Cap do you recommend for 30A?
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Offline ali_asadzadehTopic starter

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Re: How to control the output of a Current pump with the help of an audio DAC
« Reply #27 on: July 20, 2023, 01:21:25 pm »
Guys do you have any idea about AM modulation, is there a clever way to implement it in this design? so I can get ride of range resistors or digital POT IC's.
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Offline Vovk_Z

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Re: How to control the output of a Current pump with the help of an audio DAC
« Reply #28 on: July 20, 2023, 05:16:45 pm »
Quote from: ali_asadzadeh on July 20, 2023, 07:56:41 am
How much Cap do you recommend for 30A?
>= 47 uF. That's not a strict science, I guess you may try anything  like 0.1 uF and larger to get rid of power wires inductance.
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Offline David Hess

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Re: How to control the output of a Current pump with the help of an audio DAC
« Reply #29 on: July 20, 2023, 11:23:49 pm »
Quote from: ali_asadzadeh on July 20, 2023, 07:56:41 am
How much Cap do you recommend for 30A?

It depends on the required ESR.  22 to 100 microfarads per amp for aluminum electrolytic capacitors is a common starting point.
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