Hello All I am working on a problem in the Make Electronics book. Chapter 5 page 286. Enclosed is a schematic of a circuit that uses a 555 timer to rotate a stepper motor.
I understand how the rc circuit works on pins 6 and 7. The cap and resistor is used to determine the length of time the output pin stays high (pin 3)
But I am having trouble understanding how the cap between pin 3 on one 555 timer is being used to trigger pin 2 on the next 555 timer, to go low.
Since positive current is routed to all pin 2's, when pin 3 goes low after being turned off on the first 555, how does the cap between pin 3, on the first 555, cause pin 2 on the next 555 to go low. Does the positive current flow to the cap instead of pin 2? How does charging and discharging between the cap cause pin 2 to go low? Having trouble picturing this in my mind.
Thanks
Joe
I understand how the rc circuit works on pins 6 and 7. The cap and resistor is used to determine the length of time the output pin stays high (pin 3)
But I am having trouble understanding how the cap between pin 3 on one 555 timer is being used to trigger pin 2 on the next 555 timer, to go low.
Since positive current is routed to all pin 2's, when pin 3 goes low after being turned off on the first 555, how does the cap between pin 3, on the first 555, cause pin 2 on the next 555 to go low. Does the positive current flow to the cap instead of pin 2? How does charging and discharging between the cap cause pin 2 to go low? Having trouble picturing this in my mind.
Thanks
Joe
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