Hi
Has anyone used the capacitor n an RC circuit to provide the source for the Vbe of an NPN BJT?
Any problems or quirks? Anything I need to know about?
I'm having a few.
The cap voltage only gets to 640 mV which is just short of the 700 mV that is required to close the C to E connection .
Just to be clear, I do understand why the cap voltage is limited to the voltage of whatever it is that is tapping it. An LED for example.
That's not the question. My question is why does the cap not reach the 700 mV rather than the 640 mV that I am observing.
I have used 6 new 2N2222 NPN transistors with a variety of RC combos and they all produce the same result.
Can anyone shed some light on this situation?
Thanks
Has anyone used the capacitor n an RC circuit to provide the source for the Vbe of an NPN BJT?
Any problems or quirks? Anything I need to know about?
I'm having a few.
The cap voltage only gets to 640 mV which is just short of the 700 mV that is required to close the C to E connection .
Just to be clear, I do understand why the cap voltage is limited to the voltage of whatever it is that is tapping it. An LED for example.
That's not the question. My question is why does the cap not reach the 700 mV rather than the 640 mV that I am observing.
I have used 6 new 2N2222 NPN transistors with a variety of RC combos and they all produce the same result.
Can anyone shed some light on this situation?
Thanks