Hi,
I am aerodynamics student and I am designing a low-observable aircraft. I am installing sheets of electroluminescent sheet which stop the aircraft being seen as a silhouette against the light colored sky.
I have found a material that emits blue light when a voltage is applied in one direction, and red light when that voltage is reversed. The blue will be useful against the daytime sky, and red against the sky at dawn or dusk. However, I do not want both at the same time, as would occur with a high frequency AC supply.
The only circuit theory I know is very simple (basically how resistors and capacitors work).
I think to allow just a positive or just a negative voltage I would need to switch between two diodes. Then use capacitors to keep a smooth sine wave?
Also, It would be nice if I could mix the two colours, for example have two pulses of blue then one pulse of red to make a light purple colour. The freqency of a similar system I have read about uses a frequency of 3700 Hz.
Im not expecting anyone to design a circuit for me, but if anyone could perhaps give me some clues or direct me to a useful tutorial I would really apprecite it.
Thanks, Adam