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#1
04-30-2012, 04:55 PM
 theertham Junior Member Join Date: Apr 2012 Posts: 26
transistor

in a collector to base bias circuit using pnp BC 558 , what happened if a capacitor of 10pF connected across base and collector ? Rb=1M, Rc= 4.7k, Vcc=9V.
#2
04-30-2012, 05:01 PM
 #12 Senior Member Join Date: Nov 2010 Location: 15 miles west of Tampa, Florida Posts: 9,048 Blog Entries: 9

The highest frequency of amplification will change.

Where are you getting these questions?
Is this homework?
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#3
04-30-2012, 05:37 PM
 theertham Junior Member Join Date: Apr 2012 Posts: 26
transistor

this is part of my project.. two stage amplification includes RC coupled amplifier and collector to base bias circuit.. in the collector to base bias circuit , 10 pF capacitor is connected and the output from collector is given to a divide by 10 counter as clock. thats why iam asking the advantage of 10pF capacitor. here frequency will be 40kHz
#4
04-30-2012, 08:01 PM
 Audioguru Banned Join Date: Dec 2007 Location: Ontario, Canada Posts: 9,411

Your transistor is not biased properly so it probably won't work in your circuit.

 Tags transistor

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