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Transistor connection in the discharge path of the 555 timer

by titangsu
Tags: connection, discharge, path, timer, transistor
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titangsu
#1
Jul19-13, 06:25 AM
P: 5
http://www.slideshare.net/viv3ksharm...ic-school-bell

In this circuit I Think the emitter and collector terminal of the transistors T1 & T2 will be reverse. Otherwise the 555 timer will not discharge. Can anyone help pls?
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NascentOxygen
#2
Jul19-13, 07:47 AM
HW Helper
Thanks
P: 5,496
Pin 7 is the discharge pin. C1 seems to charge via the three diodes, and the purpose of T1 and T2 would be to control the discharge. I agree with you, they are around the wrong way to accomplish this.


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