[HomeBrew] Variable Power Supply - current protection

Tue, 07 Jan 2003 16:04:34 +1100

Thank you Helmut, found the device at:

http://www.mouser.com/catalog/612/200.pdf

Looks like an interesting device, will follow thru.

Evidently 317 has internal s/c protection.

Eddie

On 6 Jan 2003 at 21:47, Helmut Usbeck wrote:

> Don't remember if the LM317 has s/c protection, don't have the data sheets
> here at home.  One device I am using in a small 3 amp supply for a QRP
> transceiver I have is a solid state resettable fuse. It's basically akin
> to a triac.  Draw more than 3 amps and it "opens" up.  Remove short or
> overload and power up and down and it resets.  The 3 amp number is RGE300.
> There are other current ratings available.  It wires into the circuit as
> if it were a regular fuse.  Looks like a large monolithic cap.
> Two terminals.  Works fast unlike circuit breakers, or slo-blows.  Mouser,
> Digi-key and Allied has them.
> -Helm.  WB2ADT
> 
> On Tue, 7 Jan 2003 [email protected] wrote:
> 
> > ** HOMEBREW REFLECTOR - Please do NOT cross-post messages to multiple mailing lists on the "To:" or "CC:" line of the e-mail message. **
> >
> > Am building a normal variable voltage power supply for breadboarding using LM317
> > and would like to implement an electonic fuse and or short circuit protection.
> >
> > Not sure if s/c protection is built in to the LM317.
> >
> > The idea is to be able to vary the overload current trip say up to 1Amp.
> >
> > Anyone know of a web address or simple circuit to achieve the above.
> >
> >
> > Eddie
> >
> > VK2BEH
> >
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> 