Hello,
I have been told that the voltage across an emitter feedback resistor should be at least 1V. Please view the following attachment which shows an Re resistor of 15 ohms with around 0.16 Volts across it. Ic can vary from 0 to approximately 11 ma while the base voltage will vary from 1V to 0.5VDC.
Most of the rest of the voltage drop will be across the ce junction.
The thing is that I have swapped transistors with different betas ex:
100, 112, 155 and 165 and the only difference I would get for Ic was a 100 to maybe 500ua amps...
which really doesn't change the Ic current much.
In this case, is having less than 1 Volt across the Re acceptable?
Or am I running after trouble if I keep it this way?
All help really appreciated!
r
I have been told that the voltage across an emitter feedback resistor should be at least 1V. Please view the following attachment which shows an Re resistor of 15 ohms with around 0.16 Volts across it. Ic can vary from 0 to approximately 11 ma while the base voltage will vary from 1V to 0.5VDC.
Most of the rest of the voltage drop will be across the ce junction.
The thing is that I have swapped transistors with different betas ex:
100, 112, 155 and 165 and the only difference I would get for Ic was a 100 to maybe 500ua amps...
which really doesn't change the Ic current much.
In this case, is having less than 1 Volt across the Re acceptable?
Or am I running after trouble if I keep it this way?
All help really appreciated!
r
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