What I'm trying to do here is to press one momentary switch and set off a series of pulse event for varying lengths of time. For example I want to run a square wave pulse with output of 5V for aprox. 10 minutes, then got to a second square wave with a output voltage of 10V for 15 minutes...etc.
I thought that by using a 556, the first timer to set the first duration and the second timer to provide the pulsed voltage could do this for me.
The attached schematic shows two 556's that do just this. The brain fart I am having is how to tie the two 556's together so that when the first one is complete the second one will begin, then end and either continue to the the third, fourth, and recycle to the first once again.
Thanks for the input.
I thought that by using a 556, the first timer to set the first duration and the second timer to provide the pulsed voltage could do this for me.
The attached schematic shows two 556's that do just this. The brain fart I am having is how to tie the two 556's together so that when the first one is complete the second one will begin, then end and either continue to the the third, fourth, and recycle to the first once again.
Thanks for the input.
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