Since the new year, I have been working on setting up a maker space in my garage. It’s coming along pretty good. I set up some lights and receptacles on my existing utility counter top, and extended my wired network to a wall-mounted rack where I have some of my networking lab already installed.
While organizing my tools and components, I came across a bunch of different IC’s that I didn’t know I had like the 74LS109AJ dual J-K-not flip-flop.
These can be very useful for a number of applications. Back in school, I used several of these in tandem to increment memory addresses in EEPROM’s. Here is a small example of such a circuit using the 555 timer circuit I recently built.
Basically, I wired up the IC to toggle. I used the output of the 555 astable multivibrator circuit as clk input to filp-flop one, and then had Q1 as input to flip-flop two. It basically divides the frequency of the 555 twice.