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Here is the project file

Eugene,

How do I upload projects? I can't seem to upload a circuitproject file as an attachment.

Bill

Here is a circuit for a 4 bit programmable re-trigerable one shot. It can be expanded by adding more timer elements and expanding the NAND gate (see drawing). Each timer element consists of 1 D flip flop, 1 JK flip flop and 1 exclusive NOR gate.
1. Apply the bits to each element (MSB on top)
2. Load ...

Hi Eugene,

I tried it again and it worked. Sorry to bother you over a mistake that I must of made.

Thanks,
Bill

Here is a d flip flop with preset & clear

Thanks for the great program!
I seem to have problems with input pins when I orientate them to the top and bottom. It doesn't seem to make the proper connections to the gates. It works fine when they are on the left. Is there something I am doing wrong?
Thanks,
Bill

Eugene,

Thanks for the response!!
I have implemented one-shots using counters. It is a count to n and stop. A positive input trigger clears the counter and starts counting clock pulses until the desired count is reached and it stops and outputs a positive transition. This of course, requires that ...

Is there any way to implement a one-shot delay?