UTMonkey
Member
Hi All,
I am studying the humble transistor monostable.
According to my trusty(?) electronics book, transistor Q1 that has its base fed by the 50k x 10uF cap (see attached) is switched on bringing Q1 collector voltage low.
Putting these bits into my simulator it does what the book says (which is a first).
I get everything about what this circuit is doing EXCEPT why is it that Q1 powers on first? Surely the base voltage is reached at a slower rate because of the RxC, compared to the base of Q2 which is fed just from the 50k resistor?
Thanks in advance
p.s. yes I know a 555 monostable is easier.![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I am studying the humble transistor monostable.
According to my trusty(?) electronics book, transistor Q1 that has its base fed by the 50k x 10uF cap (see attached) is switched on bringing Q1 collector voltage low.
Putting these bits into my simulator it does what the book says (which is a first).
I get everything about what this circuit is doing EXCEPT why is it that Q1 powers on first? Surely the base voltage is reached at a slower rate because of the RxC, compared to the base of Q2 which is fed just from the 50k resistor?
Thanks in advance
p.s. yes I know a 555 monostable is easier.