Hi, I've just been playing around with building some circuits when I noticed the ripple voltage of my power supply seemed to be quite high.
I've tried testing it with a 18Ohm 10W resistor (that's the largest power resistor I have), and with no decoupling capacitors, the maximum ripple voltage at 9V 0.5A is about 220mVpk-pk.
I've looked online and they've said around 1% tolerance is generally acceptable, however, the ripple is around 2.4%.
I'm not sure how concerned I should be, however, when I add a 10uF capacitor it drops to around 50mVpk-pk which gives 0.5% ripple.
I guess my question is what is an acceptable variation in the regulated voltage from a switching power supply and should I be concerned?