### Author Topic: Current limiter  (Read 3465 times)

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#### Myeevblogacc

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##### Current limiter
« on: December 21, 2020, 04:02:54 am »
Hello everyone,
I’m interested in building a current limiter circuit to use with a 12 volt battery to power on car amplifier at low current.
Can anyone help me with an idea?
Thanks in advance

#### langwadt

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##### Re: Current limiter
« Reply #1 on: December 21, 2020, 04:17:56 am »
Hello everyone,
I’m interested in building a current limiter circuit to use with a 12 volt battery to power on car amplifier at low current.
Can anyone help me with an idea?
Thanks in advance

why do you need a current limiter?

#### bdunham7

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##### Re: Current limiter
« Reply #2 on: December 21, 2020, 04:24:35 am »
Hello everyone,
I’m interested in building a current limiter circuit to use with a 12 volt battery to power on car amplifier at low current.
Can anyone help me with an idea?
Thanks in advance

First figure out exactly what you want it to do.  Do you want it to do nothing until the current reaches 'X' amps and then a) shut off   b) fold-back the current to a lower level or c) let exactly 'X' current through ??  Or some other mode of operation?
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.

#### S. Petrukhin

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##### Re: Current limiter
« Reply #3 on: December 21, 2020, 10:47:09 am »
Maybe this Is what you need:
And sorry for my English.

The following users thanked this post: Doctorandus_P

#### Myeevblogacc

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##### Re: Current limiter
« Reply #4 on: December 22, 2020, 04:15:34 am »
Hello, and thank you for the quick response.
When repairing an car amplifier, sometimes is needed to regulate the current to reduce the risk
Of generating more problems.
I have a 12 volts 20 amps  power supply which current can be adjusted from 3-20 amps.
What I will like is to find the way to regulate the current of a 12 volts battery the same way I do with my 20 amps
Power supply.
Thank you

#### bdunham7

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##### Re: Current limiter
« Reply #5 on: December 22, 2020, 05:04:51 am »
The simplest way is with PTC resettable fuses.

https://www.mouser.com/datasheet/2/643/ds-cp-0zrs-series-1664088.pdf
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.

Smf