[sdiy] Simple power supply question

[Michael Buchstaller]

>Lately, when a load is placed on it, the +12V drops - the more you load it,
>the more it drops.

Maybe the 12 VAC does give the regulator not enough headroom to do its
Job. Try a lorger voltage (15...18 V), or increase the cap to say 4700 uF.

>However, the -12V stays normal regardless of those loads.

maybe the negative rail sees a lower load ?

>Is this caused by a bad 7812 regulator?

Possible, but i do not think so.


-Michael Buchstaller