My question refers to checking concepts.It's a scientific one,so I am not looking for a way to make a DC to AC power supply for a device because its charger broke or something similar.
The goal is to convert the output of an astable multivibrator into a sine wave that can drive a transformer in a decent way.
The way to do this:connect two low pass filters one to another.One will have a square wave at the input and convert it into a triangle wave.The other will receive it and convert into a sine wave.
I know that for each filter to work as an integrator,the time period of the incoming wave has to be smaller or equal to the RC time constant of the filter.I will calculate these accordingly.This is not the issue.
The problem starts with the square wave.I'm not sure if it should go below 0 or if it's ok to let it vary between 0 and +5V for example.The same is available to the triangle wave.I'm not sure if it will produce the desired sine wave if it won't oscillate between a negative and a positive voltage.
The question is:What kind of square and triangle waves should be generated so that a circuit such as the one described by the schematic will work as explained?Will a square wave (from the multivibrator) input which oscillates between 0 and +V make it work or should it shift from -V to +V?