UTMonkey
Member
Hi all,
The attached circuit doesn't do anything, its just my attempt to brush up on transistor operation while evaluating some software I downloaded on my android tablet.
The divider is really straightforward, with switch A open there is 100uA .
What I need explaining is the extra current that is drawn in the divider when switch A is closed.
116uA with 33uA going into the base of the transistor and remaining 83uA going through the bottom resistor of the divider.
The divider has not changed at all 50k/50k.
I have already established a relationship between the base current and the collector current (10 to 1) and the emitter current consists of the collector current plus base current.
Any one care to jog my memory.
Regards.
Mark
The attached circuit doesn't do anything, its just my attempt to brush up on transistor operation while evaluating some software I downloaded on my android tablet.
The divider is really straightforward, with switch A open there is 100uA .
What I need explaining is the extra current that is drawn in the divider when switch A is closed.
116uA with 33uA going into the base of the transistor and remaining 83uA going through the bottom resistor of the divider.
The divider has not changed at all 50k/50k.
I have already established a relationship between the base current and the collector current (10 to 1) and the emitter current consists of the collector current plus base current.
Any one care to jog my memory.
Regards.
Mark