Hi All
Its been a while. I am now doing logic gates.
Attached are two pics of a 4025 tripple tree NOR IC gate. The first pic is just a reference so you can see the gates and the pin numbers.
The second pic is the circuit I am trying to figure out. Its number one pin is on the top right whereas on the first pic the number one pin is on the bottom left. So on the second pic pins 1 to 7 are on the top row from right to left, and pins 8 to 14 are on the bottom row from left to right.
I am tring to determine what the voltage is on pins 6, 9 and 13.
As I don't really understand it here is my attempt, please explain where I am right and wrong.
Voltage on Pin 6.
Pin 6 is an output pin. Nothing is attached to pin 6. Its inputs are from pin 3, 4 and 5. Pins 3, 4 and 5 are connected to -9V.
Ummm, does that mean pin 6 has -9V on it?
How does the 1kΩ resistor drop the voltage? How do you calculate the voltage drop in this circuit? Do I need to in order to determine the voltage on pin 6?
Voltage on Pin 9.
Pin 9 is an output pin. Nothing is attached to pin 9. Its inputs are from pins 1,2 and 8. Pins 1 and 8 go to ground. Pin 2 feeds off -9V but there is a 1kΩ resistor and 8kΩ risistor on the line. No idea what voltage is going in here so how do I know what is going out on pin 9?
Voltage on pin 13.
Pin 13 is an input pin. Pin 13 is connect to the line with +5V. So I would guess that pin 13 has +5V. But there are 2 resistors on the line and I do not understand the circuit so I have no idea if pin 13 really does have +5V?
Help
Its been a while. I am now doing logic gates.
Attached are two pics of a 4025 tripple tree NOR IC gate. The first pic is just a reference so you can see the gates and the pin numbers.
The second pic is the circuit I am trying to figure out. Its number one pin is on the top right whereas on the first pic the number one pin is on the bottom left. So on the second pic pins 1 to 7 are on the top row from right to left, and pins 8 to 14 are on the bottom row from left to right.
I am tring to determine what the voltage is on pins 6, 9 and 13.
As I don't really understand it here is my attempt, please explain where I am right and wrong.
Voltage on Pin 6.
Pin 6 is an output pin. Nothing is attached to pin 6. Its inputs are from pin 3, 4 and 5. Pins 3, 4 and 5 are connected to -9V.
Ummm, does that mean pin 6 has -9V on it?
How does the 1kΩ resistor drop the voltage? How do you calculate the voltage drop in this circuit? Do I need to in order to determine the voltage on pin 6?
Voltage on Pin 9.
Pin 9 is an output pin. Nothing is attached to pin 9. Its inputs are from pins 1,2 and 8. Pins 1 and 8 go to ground. Pin 2 feeds off -9V but there is a 1kΩ resistor and 8kΩ risistor on the line. No idea what voltage is going in here so how do I know what is going out on pin 9?
Voltage on pin 13.
Pin 13 is an input pin. Pin 13 is connect to the line with +5V. So I would guess that pin 13 has +5V. But there are 2 resistors on the line and I do not understand the circuit so I have no idea if pin 13 really does have +5V?
Help
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