Empirical Circuits Dual Latch

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tonymatte
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Empirical Circuits Dual Latch

Post by tonymatte » Fri Jun 08, 2018 3:26 pm

Image

The Dual Latch rolls two SR flip-flops into a 2hp form factor, created to provide a means of toggling hold/freeze inputs on digital modules with a single trigger source. A trigger sent to an up arrow input will set the corresponding output high, while a trigger sent to a down arrow will set it low. The input's with gold up and down arrows will flip the state when a trigger is received.

More info available on its MG page here.

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batch
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Post by batch » Sat Jun 09, 2018 12:10 am

This is really cool.
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Post by lohacker » Sat Jun 09, 2018 12:33 am

Very nice and useful, I've already seen some clips on your Instagram and I'm interested to try it out. I like also the sergesque panel graphics! Bravo! :tu:

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Post by huffnPuff » Sat Jun 09, 2018 6:58 am

I got one of these, it’s a cool little module. It’s very pretty and it remembers so I don’t have to 8-)

It fits with the way I’m going: replacing complex modules with basic building blocks and doing away with software-based modules all together.

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Post by huffnPuff » Sat Jun 09, 2018 3:20 pm

I schooled myself in flip flops here: http://www.circuitstoday.com/flip-flops

The Dual Latch has two SR flip flops (with an additional toggle input), the most basic type of FF. You can patch one yourself from logic gates like so:

Image

You can patch more advanced flip flops (clocked SR, clocked Data) using logic gates and the flip flops in the Dual Latch.

There’s a full featured dual flip flop module from Omiindustriies, but it’s DIY only and 8hp.

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Post by huffnPuff » Sat Jun 09, 2018 3:22 pm


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tonymatte
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Post by tonymatte » Sat Jun 09, 2018 9:13 pm

Thanks guys, really appreciate the positive responses!

And thanks huffnPuff for digging up some useful info on SR flip-flops. I always try to explain them to people unfamiliar with flip-flops as sort of trigger controlled gates, but that seems to create a confusion of its own. It's probably best to just learn what they really are and how they fit in with other logic modules to create more complex or useful behavior.

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Post by huffnPuff » Sun Jun 10, 2018 1:44 am

I find it interesting that memory, in its simplest most basic implementation is a feeback patch. Makes you reflect about reflection... :hmm:

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Post by tonymatte » Tue Jun 12, 2018 1:56 pm

Yeah! Of course the memory on the Dual Latch is volatile, since it's only a CMOS chip at the core. So buying a whole bunch of these won't allow you save patches through power cycles or anything space age like that.. Which was never the point of the module. I often reach for mine at the end of a patch session to get some sort of dramatic change going on, works well with a slew limiter like Function!

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Post by huffnPuff » Wed Jun 13, 2018 3:11 am

I think I need another DL?

I’m using the awesome NLC Divide & Conquer for counting things, but it doesn’t have a reset input. A second DL (four flipflops in total) would allow me to count from 0000 to 1111 and also SET or RESET each bit whichever way I want, right?

Unless someone knows of a CMOS clock divider with a reset input? I’d like to be able to do this in hardware.

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Post by tonymatte » Wed Jun 13, 2018 11:17 am

If I'm thinking about it correctly, since the set and reset inputs override the toggle inputs you could use two DL's to do that but you would need to send your reset signal to all resets simultaneously for it to reset all of them at once. If you just send it to one it will only will only temporarily inhibit any flip-flops that come after it.

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Post by huffnPuff » Wed Jun 13, 2018 11:32 am

Sure, I was thinking of multing the reset signal to all the sub-units. In fact, using flipflops this way allows me to set the initial state to any arbitrary value - setting and resetting individual bits any way I please.

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Post by tonymatte » Fri Jun 15, 2018 6:04 pm

Just a little patch idea for those who have acquired a Dual Latch! I've been having fun using one with a slew limiter and comparator combo as a pulse stretcher for variable beats and stuff.

Send a trigger from something to a Set input then, using a stackable, send the Gate out from the Latch to your slew input. Set Fall to immediate, and send the output from the slew to a comparator looking for about 4 volts. Then patch the comparator output to the Reset input on the Latch and adjust Rise time to change the pulse length. The Gate out is split with a stackable so you can use it!

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Post by huffnPuff » Mon Oct 01, 2018 9:53 am

OK, so here's a funny one: both my copies were working the other way around! A trigger to the down arrow would turn the output on?

And then I realized both modules were mounted up side down.
:eek: :eek: :mad: :eek: :eek: :eek: :eek:

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Post by tonymatte » Fri Oct 05, 2018 1:59 pm

Yeah that can happen! :hihi: The symmetry can make things confusing, the LEDs should be on the right half of the front panel.

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Post by starthief » Fri Oct 05, 2018 2:07 pm

huffnPuff wrote:OK, so here's a funny one: both my copies were working the other way around! A trigger to the down arrow would turn the output on?

And then I realized both modules were mounted up side down.
Inverting the logic by inverting the module, I like it :hihi:
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Post by huffnPuff » Fri Oct 05, 2018 3:55 pm

The thing is, since the outputs are marked with an exclamation mark !, also used to denote logic inversion, I thought in a moment of confusion that it was the way the module was designed.

But I remember patching it before (reorganizing my case) and it worked as expected... WTF????

:zombie:

Anyway it's a very useful module.
:eek: :eek: :mad: :eek: :eek: :eek: :eek:

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Post by Footkerchief » Wed Nov 14, 2018 2:35 pm

Does this work at audio rate as a suboscillator?

edit: NM, module description already says yes!

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Post by batch » Tue Feb 26, 2019 5:41 pm

Making any more? I have two, but would like another 2-4.
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Post by natureclubcassettes » Wed Feb 27, 2019 12:21 am

illuminating

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reodjectz
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Post by reodjectz » Tue May 14, 2019 7:25 am

Are these available anymore? Would love some for my 1U-free case.

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Post by Johnnyfive » Sun Sep 01, 2019 7:09 am

reodjectz wrote:Are these available anymore? Would love some for my 1U-free case.
I'm also keen to get one of these if they are still around (or if another production run is planned)

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Post by sko87pro » Tue Sep 03, 2019 12:50 am

Johnnyfive wrote:
reodjectz wrote:Are these available anymore? Would love some for my 1U-free case.
I'm also keen to get one of these if they are still around (or if another production run is planned)
+2 Yes, I'd like to get this also.

Love a good latch, I always say

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Post by mosorensen » Tue Sep 03, 2019 1:29 am

I have a Pico Logic, but I use it mostly as two SR flip-flops for "time quantizing" random triggers (e.g, from a Krell patch). Connect the clock to "set" and the random trigger to "reset". After the trigger fires, the SR flip-flop outputs a gate exactly on the next beat of the clock. This module would be perfect for that.

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gummyboy
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Post by gummyboy » Tue Sep 03, 2019 6:22 am

wow..I want one too

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