voltage reg. Question

[James Shearer]

Hi,
   Have you got a current-limiting resistor in series with the LED?
               _________
               |       |
Vunreg --------| Reg   |---------| +Vreg
               |_______|         |
                                |-|
                                | | Rlim
                                |_|
                                 |
                                 |
                                _|_
                                \ / LED
                                ---
                                 |
_________________________________| 0v

Sorry if I'm teaching granny to suck eggs..:)

Jim

In message <Pine.GSO.3.96.990104145913.7175L-100000 at general1.asu.edu>,
Reverend bluE <djblue at asu.edu> writes
>
>what signs does a blown voltage regulator exhibit?  (besides no output
>voltage).
>
>I have one that gets really really hot really fast, and there is no output
>voltage...  
>
>and what causes this?  I installed it and tested it, I got the desired
>voltage, then after I hooked up my LED's the one didn't come on, and now that
>voltage reg is the one that gets really hot, while the other side (the
>negative side) is. I'm using the big regulators that have a hole in the mfor
>attaching a heat sink. (can't remember the part numbers)
>
>again, much thanks.
>
>VCO1 is done (mounted on a piece of cardboard for now) power supply is done
>(except for the blown voltage reg), and I have my power cabling set-up and
>made one cable (for the VCO).  gonna test it as soon as I put in the new
>regulator (but I have to go buy one first)
>-ben in Phoenix
>

-- 
James Shearer