Playing small motors from synth and arduino

[hk_jh]

@jim-p

They both do the same thing, however these circuits are to protect against temporary excursions of the signal going above 5V and below 0V.

So if my signal is above or below 0V 5V for longer duration is that clamping circuit might not work as intended?

would you build it using the zener diode or two 1N5817 diodes?