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Connecting monostable 555 to astable 555

Thread starter #1
I am currently connecting a circuit where I power the astable 555 via the monostable 555, but my astable seems to be giving a constant 3.5V even when the monostable is not activate. It works on multisim but doesnt work wheni connect it Can someone help? Thank you!
 

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schmitt trigger

Well-Known Member
#2
If you are attempting to make a gated burst oscillator, which will drive your counters downstream, I would do *independent of each other* astable and monostable circuits, and combine their outputs with an AND gate.
 

crutschow

Well-Known Member
Most Helpful Member
#3
Sounds like a wiring error.
If the trigger input is held low, the output will remain high.
Double check all the connections against the schematic.
 

Les Jones

Well-Known Member
#4
Have you tried connecting the top of R2 directy to +5 volts ? If it is a standard 555 (Not the CMOS version ) a 5 volt supply is close to it's minimum voltage rating of 4.5 volts it may not work at your designed operating frequency (48 Khz.)

Les.
 

alec_t

Well-Known Member
Most Helpful Member
#5
Have you tried driving the Reset pin of the astable for switching it on/off?
 
Thread starter #6
If you are attempting to make a gated burst oscillator, which will drive your counters downstream, I would do *independent of each other* astable and monostable circuits, and combine their outputs with an AND gate.
Thank you! It finally worked.
Thank you everyone for your suggestions too!
 

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