Is there any use for reset pin 4 in monostable operation? Cannot find any info on this.

 

Is there any use for reset pin 4 in monostable operation? Cannot find any info on this.

What do you want for the reset function?
You can try it when it connecting to Vcc and Gnd, what do they have any difference?

 

The reset pin 4, makes the output pin 3 instantly to gnd when its taken to ground ,for normal operation the reset pin is kept at posative pin8.

 

What do you want for the reset function?
You can try it when it connecting to Vcc and Gnd, what do they have any difference?

I'm just trying to figure out exactly what the pin does, maybe in the hopes of simplifying a circuit that uses 2 timers. If grounding the pin can be used to deactivate the 2nd timer, that could be useful for my application.

The reset pin 4, makes the output pin 3 instantly to gnd when its taken to ground ,for normal operation the reset pin is kept at posative pin8.

Thank you.

 

I'm just trying to figure out exactly what the pin does, maybe in the hopes of simplifying a circuit that uses 2 timers. If grounding the pin can be used to deactivate the 2nd timer, that could be useful for my application.

What I knew the methods to control a 555 astable to stop generate the pulse as :
1. Using a PNP bjt to control from Vcc(pin 8) with a low level in base.
2. Using an NPN bjt to control from Gnd(pin 1) with a high level in base.
3. Control the reset pin (pin 4) to Gnd.
4. Control R1 to Gnd. (see astable circuit)

 

Read this thread which seems eerily close to what you are asking about. Really a striking similarity.

Ron