Turning off device for a period of time with 555

[Letniq]

Hi all,
Is there a way to turn off device for a period of time with monostable 555?
I want when I trigger the monostable 555 to turn off another astable 555 circuit for some period of time and then to turn on automatically when the time expires.
Thanks

 

[emmagood]

Hi,

Can you consider using an astable 555 config. triggering another astable config rather than a monostable triggering an astable config ?

If you can do so, simply set the time period of the first astable config for the duration for which the second astable config has to be switched off. Then, connect a P transistor between supply and vdd pin of second astable config. connect the ouput of first astable config to gate/ base of p transistor.

so now, when the first astable conif switches on, it triggers the p transistor into cut off region, swithcing it off and thereby switching off the second astable config. After the set time period, the first astable config switches off, reducing the voltages of the gate, thereby switching on the p transistor and the power supply to the second astable config (switchint it on automatically)

 

[Letniq]

I think I came to an answer but I'm not quite sure.
Is there a transistor or any other element that when the is a signal on the gate It shuts off the connection between base and emiter ?
I hope you understand what I mean

 

[cdh7]

Hi,

Is there a transistor or any other element that when the is a signal on the gate It shuts off the connection between base and emiter ?

Not quite sure what you mean (gate is for FETs, base+emitter for bipolar) but are you talking about a transistor with a sort of "negative logic"? Maybe a PNP then. If the collector and base are both connected to a high signal level, no current flows. But if the base goes to a low signal level, then the transistor switches on.

Regards,
Chris