 Selectable 555 modes HELP!
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ben5017
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Fri Feb 01 2013, 06:53PM
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Registered Member #3315
Joined: Thu Oct 14 2010, 04:23PM
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Posts: 156
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I am lookin for a little advice
I am trying to have a switch change between the two 555 modes.
My circuit needs to be a selectable between monostable and astable modes.
But both only output when a trigger is pressed.
The outputs will be sent to an igbt driver.
-Can have 2 555's outputting to the same driver?
-How would you go about combining the circuits?
-If both 555's outputs are connected to the same driver, would the output of one-cause problems with the other 555?
-Where would you put the trigger in astable mode?
-Do I need seperate drivers ( one for each mode) then connct them to the gate of my igbt?
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hboy007
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Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
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Posts: 374
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just a few hints: a 555 timer configured as an astable multivibrator will start up with a longer half period. Keep that in mind or include some kind of fast IGBT overcurrent shutdown. You can parallel two 555s using simple diode logic (two 1N4148 diodes and a pull-up resistor). Two 555 timers are available in one package as NE/LM/LMC556.
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