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Help me design an astable mode pulse generator using NE555

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handsprince

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i wish to design a astable mode pulse generator using NE555 with time for high is 1s and time for low is 30s, the problem is i cannot get a positive resistor value using the formula given. so how can i solve this problem?
 

astable ne555

This can't be achieved without additional components, could be e.g. fast charge through a diode from output instead of fast discharge through Disch pin, or - simply a inverter at the output.
 

ne555 1s pulse generator

Try to use 556
 

pulse generation ne555

Hi Friend,

Refer "OP-AMPS AND LINEAR INTEGERATED CIRCUITS" by "RAMAKANT A. GAYAKWAD" Prentice Hall Of India Publications.


Regards,
Avinash.S.
 

ne555

Hi friend,
U can use seperate path for chrg & discharge to get accurate timing pulse.For this three resister & two diode are needed.
 

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