I build a "fairy phone" out of an old rotary phone, an Arduino Pro Mini 3v3/8Mhz, an Adafruit Audio FX Sound Board and a rechargeable battery.
In an attempt of being clever, I reused the handset holder as on/off button switch. What I did not take into consideration is that kids not only have fun playing with the rotary dialer, but also with the handset hangup buttons. As a result, arduino and soundboard are toggled on/off often and in short cycles.
Is this somehow bad for the devices? Should I add an capacitor to bridge over short on/off cycles? I never write to eeprom, AFAIK the Sound Board does not write to it's memory in playback mode.