Hi All,
Always a resistor about 10Kohm to GND in front of base, is that a resistor to draw out the parasitical capacitance in transistor (Vf) ?
Thank you very much for lesson.
Best regards, Boki.
- posted
18 years ago
The resistor in base to gnd. (transistor)
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- posted
18 years ago
Depending on speed and on other parameters, it can be lower, say 500 Ohms.
Rene
-- Ing.Buero R.Tschaggelar - http://www.ibrtses.com & commercial newsgroups - http://www.talkto.net
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- posted
18 years ago
The resistor gives the leakage current ICeo somewhere to go. Otherwise, at high temperatures the transistor could turn itself on. Also, with a restor from base to emitter, the Vce voltage breakdown value is increased to somewhere between Vceo and Vces.