Originally Posted by winglit
I don't think that your rounded square wave would cause any damage. Some standby inverters I have seen give a sawtooth output and are designed to operate the stby instruments such as ADI for at least an hour on battery power.
When I said 'rounded' I meant just rounded at the corners... I don't know about damage, but it certainly makes a noise.
When you say "sawtooth" it already 'starts looking' like a sinewave, and as long it's used to drive the motor in an emergency horizon or the power supply in a radio altimeter indicator, it would do the job!
Any sources?