Maker Pro
Maker Pro

Creating a latch circuit with logic gates

Sadlercomfort

Ash
Feb 9, 2013
424
Joined
Feb 9, 2013
Messages
424
No it's an assignment, although It is a fun challenge. Otherwise I would of used a PIC microcontroller interfaced with a keypad and programmed it with assembly. Unfortunately its much more complicated than that.
 

hevans1944

Hop - AC8NS
Jun 21, 2012
4,878
Joined
Jun 21, 2012
Messages
4,878
Well, I suppose you have to work within the constraints imposed by your customer (or worse, your boss). Maybe you can make a pitch for the PIC microcontroller + keypad idea, and if that is acceptable, save yourself a lot of time and effort.
 

Sadlercomfort

Ash
Feb 9, 2013
424
Joined
Feb 9, 2013
Messages
424
I have to use circuitwizard sadly, but I've learnt alot of the experience and feel quite close to completing my assignment.

Just need to get the bugs out. How do I make the JK's Q output, positve edge triggered rather than negative?
 

hevans1944

Hop - AC8NS
Jun 21, 2012
4,878
Joined
Jun 21, 2012
Messages
4,878
Try the SN54AS109A series of positive edge-triggered J-K flip-flops. See attached data sheet. Note the K input is active low while the J input is active high. That means if you tie the two together it acts like a D-type flip-flop.
 

Attachments

  • sn54as109a.pdf
    1,009.3 KB · Views: 75
Top