I have a PIR motion detector that runs off a 9 volt battery, and it will output a 9 volts for about 15 seconds. This is good for 1 maybe 2 flashes. I've had no luck getting these flash boards to work on anything other than 1.5 volt batteries. Tried to drop the voltage with a simple resister, voltage divider, diodes. I fried this flash board with a potentiometer...
Just guessing I fried the inverter transistor, likely the weakest part, can't rule out the transformer, and have no specs on it anyway. Hate to count on the transformer being good, and handling the higher voltage.
Guess I should give a quick overview of this whole project...
A solar panel charges a 9 volt battey pack during the day, then powers the PIR at night.
Neighbor's cats (way too many, 17 last count), the raccon, or the fat (pregnant) opposum triggers the PIR, which fires the flash (will adjust for 2-3 flashes later). Also, a loud "POP" will be heard with the flash.
Blinding flash and loud noise should deter most nighttime visitors, people too...
Everything is going well, except the flash board, and I need to determine how much abuse a piezo-tweeter can stand.