i agree,you should use diodes regardless of the application. use a diode with a peak inverse voltage (PIV) of at least twice the max output voltage. 1N4002 or hgher, if you plan on alot of transients and spikes, a schotty diode (SB180) may be a better choice. also the lm317 series and most adjustable regulators do not drop to 0V
LM317 Variable power supply
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i agree,you should use diodes regardless of the application. use a diode with a peak inverse voltage (PIV) of at least twice the max output voltage. 1N4002 or hgher, if you plan on alot of transients and spikes, a schotty diode (SB180) may be a better choice. also the lm317 series and most adjustable regulators do not drop to 0V