When the case of the red diodes is connected to 5v and not electrically insulated it gives some inconvenience in isolating the red module from the projector's base plate that is grounded.
To circumvent this, can we not simply connect the drivers high side to the base plate (0V) and connect the driver's low side to a -5V supply? The driver still sees a 5V voltage supply and the case of the red module will have the 0V base plate potential, eliminating the need for electrical insulation.
I don't see a problem with this.
It introduces an inconvenience with the modulation signal (0 to 5v) which will be 10V higher than the -5V low side of the driver.
How can we bring the modulation signal in the -5v to 0V range? or will it introduce a bigger hassle than isolating the whole module from the base plate?
thanks,
Matthijs