Slectable momentary or latching action - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Construction Tips
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Construction Tips Construction techniques and tips

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 6th September 2011, 11:41 PM   #11
diyAudio Member
Join Date: Aug 2011
I've kept at this and found I got it wrong above.
Momentary switch should be connected to the clock line, while the data line is connected to the "not Q" line.

Then, at a touch of the momentary, the flipflop will go from Q output, to Not Q.

Still... How can the flipflop keep the output high after the momentary witch is released? Doesn't there need to be another power connection directly to the flipflop somehow?

  Reply With Quote
Old 7th September 2011, 12:16 AM   #12
Enzo is offline Enzo  United States
diyAudio Member
Join Date: Sep 2004
Location: Lansing, Michigan
Any basic logic tutorial will cover flip flops, whether CMOS or TTL. The configurations will be the same, just the part numbers and voltages will differ.

All logic ICs need power and ground connections. SOme pins may be also conected directly to V+ or ground. And you may see pins connected to other pins, for example, the /Q conected back to the data pin. Now every time the clock advances, the Q and /Q will toggle, putting the opposite state on the data pin.

The whole point of flip flops is that they only change state when you clock them. Or when set and reset pins are enabled. And even then, rising edge and falling edge matter. They will latch into the state you put them
  Reply With Quote
Old 7th September 2011, 12:51 AM   #13
diyAudio Member
Join Date: Aug 2011
Almost all of the tutorials and such that I encountered used a block diagram for the flipflop. the diagram would only show 4 lines, data, clock, Q, not Q.

They didn't show the V+ or gnd.

Duh, that's what I was missing. thanks.
  Reply With Quote
Old 8th September 2011, 12:03 AM   #14
Enzo is offline Enzo  United States
diyAudio Member
Join Date: Sep 2004
Location: Lansing, Michigan
The power connections are usually assumed. SOme drawers will add them to one of the gates in the IC, but in logic, every chip has them, so they don;t clutter the drawing with them.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Latching Switch Assemblies bishka Parts 9 19th September 2010 07:07 AM
control a latching relay with one switch? peace brainerd Parts 13 8th January 2009 04:24 AM
Driving a latching relay Nixie Parts 5 28th August 2008 07:41 AM
Momentary Switch mourip Parts 11 26th June 2006 09:53 PM
555 timer latching nickch Parts 1 20th July 2005 08:48 AM

New To Site? Need Help?

All times are GMT. The time now is 02:22 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2