Electronics > Projects, Designs, and Technical Stuff
Need help designing a load selector!
MarkF:
One of your counter chips will give you 4 bit binary count.
You can use the NAND gate(s) to create the 'Data' input to the shift register.
Refer to the timing diagram I added a few posts back.
WyverntekGameRepairs:
All right. So what is the schematic looking like now?
MarkF:
Maybe some partial testing is needed here.
Take the last circuit posted and remove the SN74196 decade counter.
Testing the CD4094 and LEDs:
Then manually clock in all 1's followed by all 0's and verify the shift register and LEDs are working.
- Tie 'Data' pin (2) high.
- Press the switch five times. (all LEDs should turn 'On' one at a time)
- Tie 'Data' pin (2) low.
- Press the switch five more times. (all LEDs should turn 'Off' one at a time)
Then, you can figure out the logic to generate the 'Data' input signal.
MarkF:
I found an error:
The Output Enable (pin 15) and Stobe (pin 1) both need to be 'High'.
I have the wrong chip on the drawing.
MarkF:
It appears that I miss-read you original post several times....
You never ask to have ALL LEDs On at one time. Just sequence through and one all Off state.
I think I fixed the startup initialization. The RC time constant may be too short for the LOAD pin.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version