12127Re: [SeattleRobotics] current limit?
- Nov 1, 2002On Friday 01 November 2002 12:43 pm, toolguy500 wrote:
> what do i do to limit current in a circuit?Depends on how much efficiency you want. If you don't care about power
> i have about a 12v source i wanna connect to about a 1 ohm load,
> limit to about 5A and have the supply stay around 12v.
or heat, you could use a linear circuit (like two power transistors
or an LM338) to drop the 7V. But you'd be dissipating 35W of heat:
this is more than the 25W you're putting into the load!
Much higher efficiency would be to use a switching power supply that
could give you 5V at that current.
Do you really need current limiting, or just a 5V supply? That is, is
this a resistive load where you could use a fixed voltage?
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