I need to replace a physical switch with a transistor. I have a 12V supply which is always on, and i have a 12V control signal.
I need some way of generating a short pulse on both the power up of the 12V control signal and the power down of the control signal. It must be a short pulse (to replicate a short button press <1s >500ms).
I looked at 555 monostable timer circuits but they need to see high-low-high. Where as I can provide only high-low and low-high.
Can anyone provide any hints on possible ICs or circuits to achieve this please?