Hello.
As the title says, I would appreciate some help with the stopwatch I'm making.
This is what I've got so far:
**broken link removed**
TTLs will be in LS versions.
The bottom part is the divider, it gets the frequency from 3.2768 MHz (the frequency of the crystal I'll use) down to 100 Hz.
The upper part is, of course, the counter and display part.
The counters should count as they are supposed to (according to the simulator).
All the resistors are 330 Ohms.
The thing that bothers me most is - connecting the crystal instead of the 5V square wave source. I simply don't have the knowledge to do that and in the time I spent with my friend Google, I didn't manage to figure it out.
I found a few possible ways to connect the crystal, but according to the simulator, they either produce the wrong frequency or drop the voltage quite a bit.
I would appreciate some help with that.
The other thing I'd like to ask is - are the resistors of the right size, and am I missing any?
Any other concerns?
As the title says, I would appreciate some help with the stopwatch I'm making.
This is what I've got so far:
**broken link removed**
TTLs will be in LS versions.
The bottom part is the divider, it gets the frequency from 3.2768 MHz (the frequency of the crystal I'll use) down to 100 Hz.
The upper part is, of course, the counter and display part.
The counters should count as they are supposed to (according to the simulator).
All the resistors are 330 Ohms.
The thing that bothers me most is - connecting the crystal instead of the 5V square wave source. I simply don't have the knowledge to do that and in the time I spent with my friend Google, I didn't manage to figure it out.
I found a few possible ways to connect the crystal, but according to the simulator, they either produce the wrong frequency or drop the voltage quite a bit.
I would appreciate some help with that.
The other thing I'd like to ask is - are the resistors of the right size, and am I missing any?
Any other concerns?