T1 and T2 are NPN,...
...but the transistor you showed me in the picture is, if I'm not mistaken, PNP:http://3.bp.blogspot.com/-iTo2cABnytE/UAmCx3gD34I/AAAAAAAAFBc/_xjB__ClEuI/s1600/NPNvsPNP.png
what's the point of the 2nd transistor?except increasing propergation time?
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via Egeo 16