My son tried to build a sound controlled fan.
The idea was to call out to start the fan and have it running till you called out agin to turnit off, i.e:
Sound Trigger + latch + fan
The result however is that when he does some noice the fan just turns for a few seconds and then stopps, just as if the latch was not there.
If the fan is replaced by a RGB LED, the light turns on till you call out again, perfect!
If the Sound Trigger is replaced by a button, the fan turns till the button is pressed again, perfect!
We tried with battery, and USB power, no difference.
We applied many wire bits to the fan to make sure any noice/vibrations from the fan does not interfear with the Sound Trigger, no luck.