Hi, as I'm new here I hope anyone can help me.
I have the following problem:
As you can see at
**broken link removed** (also attached)
I want to switch four relais (tried it first with LEDs). Forget the switch at the beginning, this doesn't work like this.
The rest works fine, but this 74LS92 just does not count the way I want.
I want to count from 0 to 3 and then reset to 0 and start again.
What it does:
*) starts at the first LED
*) after first trigger it jumps to second
*) after second trigger it jumps to four :?
*) after third trigger it jumps again to second
*) then it jumps again to four :evil:
*) then to two
*) to four - to two - to four - to two - to four - ...
*) sometimes it starts at the beginning, 1 - 2 - 4 - 2 - 4 - ...
*) sometimes it really jumps to three
*) most of all it jumps between two and four
WHY ???? :?:
It would be perfect to get some hints on this, as I don't know a way out of this.
Thanks
Thomas
also a strange thing: I want to trigger the 74LS92 by a NE555 (pin3 out) over pin 14... doesn't do anything...
I have the following problem:
As you can see at
**broken link removed** (also attached)
I want to switch four relais (tried it first with LEDs). Forget the switch at the beginning, this doesn't work like this.
The rest works fine, but this 74LS92 just does not count the way I want.
I want to count from 0 to 3 and then reset to 0 and start again.
What it does:
*) starts at the first LED
*) after first trigger it jumps to second
*) after second trigger it jumps to four :?
*) after third trigger it jumps again to second
*) then it jumps again to four :evil:
*) then to two
*) to four - to two - to four - to two - to four - ...
*) sometimes it starts at the beginning, 1 - 2 - 4 - 2 - 4 - ...
*) sometimes it really jumps to three
*) most of all it jumps between two and four
WHY ???? :?:
It would be perfect to get some hints on this, as I don't know a way out of this.
Thanks
Thomas
also a strange thing: I want to trigger the 74LS92 by a NE555 (pin3 out) over pin 14... doesn't do anything...