Hi everyone, I am new to electronics and I'm attempting to build a emergency vehicle type light. I have 2 555 flasher circuits built that work with an adjustable flash speed, my problem is alternating between the circuits. I originally thought just another 555 adj. flash speed circuit was the answer but I can't seem to get it to switch between them. any suggestions would be very appreciated. Sorry if I'm not posting correctly or if this has been covered, but I wasn't able to find anything in the search. Thanks in advance.