grrr_arrghh
New Member
Hi.
Imaginary scenario is as follows:
I have an IC (something like 4000 series), with a reset pin. This resets the IC when the pin is taken low (unusual, I know, but bear with it)
So, I have the pin held high, through a 10K resistor. It is connected low through a transistor (something common, like a BC548).
The transistor will turn on when there is voltage at the base, and take the pin low. That means that when the input goes 'high', it will take the pin low (avoiding the need for an inverter).
1) Is this right?
2) What sort of resistance will the transistor have (collector to emitter), when the voltage at the base is around 6v?
3) Is there any easy way of working this out?
4) Is it roughly the same for all transistors?
5) Could I use the same method to take a pin high?
6) Is there anything I have forgotten to take account of here?
Thanks very much
Tim
Imaginary scenario is as follows:
I have an IC (something like 4000 series), with a reset pin. This resets the IC when the pin is taken low (unusual, I know, but bear with it)
So, I have the pin held high, through a 10K resistor. It is connected low through a transistor (something common, like a BC548).
The transistor will turn on when there is voltage at the base, and take the pin low. That means that when the input goes 'high', it will take the pin low (avoiding the need for an inverter).
1) Is this right?
2) What sort of resistance will the transistor have (collector to emitter), when the voltage at the base is around 6v?
3) Is there any easy way of working this out?
4) Is it roughly the same for all transistors?
5) Could I use the same method to take a pin high?
6) Is there anything I have forgotten to take account of here?
Thanks very much
Tim