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Timer 555 one-shot trouble


 

Hello.
I?m trying to test some ciruits with several models of the tlc555 timer(i.e. the models here in the database or provided with LTSpice), but am not able to run it in monostable (one-shot) mode like in this description :
C1 (and so the threshold voltage)charges up to Vcc and nothing switches. The output only followes the trigger signal, provided by a voltage controlled switch.
Each model i tried behaves the same. Astable circuits do operate well.
The crackpoint seems to be the connection between discharge and threshold pins ?

Yours
Reinhard

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