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What the latch?

Pyramid

Jan 17, 2017
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Please see post #11 above. If I read the OP correctly, he wanted a simple set/reset type flip-flop which this circuit provides. It may be simpler to use a octal latch i.e. 74273 types, but they don't have individual sets/resets.

The 74 series has higher current variants (AC), but they are limited to 5V supplies (I think the OP was looking for 9/12V capability). The 4049 or 4069 is a hex inverter, but w/o schmitt trigger inputs. AFAIK, the 40106 is the only version that meets his requirements.
 

hevans1944

Hop - AC8NS
Jun 21, 2012
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The 7414 is not a flipflop, it is a hex inverter, and is available in a ton of different technologies (LS, HC, AC (my fav), etc.)

ak
I think perhaps they were thinking of wiring pairs of them as RS latches. See @Pyramid's post #11. I've done this many times, usually for de-bouncing SPDT switches... and you don't need the resistors shown in the schematic.
 

BeagleFaceHenry

Nov 11, 2016
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May I ask, what's the functional difference (or similarity) between a flip flip and a hex inverter?
 

hevans1944

Hop - AC8NS
Jun 21, 2012
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A flip-flop (NOT a flip flip, whatever that is) retains either of two stable output states and thus exhibits memory.

A (hex) inverter responds in real time to an input logic state by inverting that state without any memory of previous states: Thus if input = 1, output = 0; if input = 0, output = 1. In a hex inverter there are six of these logic elements, all acting independently.
 

BeagleFaceHenry

Nov 11, 2016
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Ok, I'm still working on this one, thanks to anyone who is still hanging on.
Great catch Hevans, thanks for the info. A hex inverter is nothing like a flip flop.

I have another question. I have a 9v wall wort that I'm using as a power supply. Most of the flip flops I see are rated for only 5v. I've seen a little 5v regulator (3 pin chip) at Radio Shack for a couple dollars. Is that 5v regulator chip what I need to protect my 5v flip flops from my 9v supply, or am I deluding myself once again?
Thanks!
 

Minder

Apr 24, 2015
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I have a flip-flop circuit using one P.B., two relays 3 diodes and a cap.
M.
 

hevans1944

Hop - AC8NS
Jun 21, 2012
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I've seen a little 5v regulator (3 pin chip) at Radio Shack for a couple dollars. Is that 5v regulator chip what I need to protect my 5v flip flops from my 9v supply, or am I deluding myself once again?
Yes. I frequently use one for just that purpose when prototyping with 5 V TTL logic devices. If you use CMOS logic devices, they can be powered directly from your 9 V wall wart. Or you can "roll your own" flip-flop from discrete components as Minder suggested.
 
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