A project log for Single Comparator/Op-Amp[?] Toggle-Flip-Flop

Imagining a pen-clicker, had to test my analogish-skills...

eric-hertzEric Hertz 04/16/2018 at 00:497 Comments

Here it is, in all its glory!

First, the audio is converted to PWM.

Then both PWM edges are converted to falling-edge pulses.

This, then, could be fed directly into a floppy drive's "write data" input, storing the PWM on-disk.

When read-back from the disk, the floppy drive will give these same falling-edge pulses to indicate each edge of the recorded PWM.

That, then, gets fed into my single-comparator T-Flip-Flop, to convert those falling-edges back into PWM, then directly drives a speaker.


Ahh, right... So, this video was recorded months ago... long before I ran the 500KHz simulations. I can't recall the frequency this is running at, but it's surely slower than 500KHz, otherwise, as my conclusions, after running the sims... concluded... This system probably won't run at 500KHz, with the LM311's I used.

I do have faster (2ns!) comparators in the ol' storage-unit... but haven't really decided to go that route, much easier to use a 7474... and, realistically, I only need 500KHz for the *image* portion of #Floppy-bird, which wouldn't benefit from a T-FF at all, being that it'd still have to go into the uC for processing...

However, (wee, look at this link go!) it would be an interesting thing to try, some day, maybe... 500KHz...


Dr. Cockroach wrote 04/16/2018 at 01:03 point

I knew you would figure it out :-) Oh BTW this is the first I have heard your voice :-)

  Are you sure? yes | no

Eric Hertz wrote 04/16/2018 at 08:09 point

Heh, well, actually, this video was recorded months ago... I've only just downloaded all the stuff off my camera and found that gem I'd completely forgotten. There were others, a little better, maybe, but in serious need of editting. This take, well, I sound a bit sarcastic. Ah well.

  Are you sure? yes | no

Dr. Cockroach wrote 04/16/2018 at 08:16 point

Oh, I don't know. You sounded fine to me and the vid did give me a different angle of how you are set up in your secret lab ;-)

  Are you sure? yes | no

Eric Hertz wrote 04/17/2018 at 01:18 point

Heh, well, the secret lab has been reverted mostly to 'home'... The lab part took a major hit with the broken-glass-everywhere incident, requiring removal of all non-essentials... still finding glass 'in home' from time-to-time. And the lab-stuff... well, I haven't been able to clear the glass outta all that... That'd be a big ordeal, hard to vaccuum around resistors and such, and the 'workbench' was set atop some drawers which really just aren't conducive to being cleaned in this way. Little nooks and crannies that are perfect for storing a large stockpile of glass-shards to be released a few at a time at every pot-hole. :/

But I've cleaned and restocked some essentials for the latest projects, and now I'm leaning *way* over using a tote-bin shorter than my knees as a work-surface/desk/table. Weee! Though I did finally invest in dry-erase markers... Three for One Dolla!

  Are you sure? yes | no

Dr. Cockroach wrote 04/17/2018 at 10:05 point

My hats off to what you are able to do. If I ever hit the big lotto then it's R/V, name it for you :-)

  Are you sure? yes | no

Dennis wrote 04/16/2018 at 00:55 point

Very cool! Great work!

  Are you sure? yes | no

Eric Hertz wrote 04/17/2018 at 21:31 point

thankya, sir!

  Are you sure? yes | no