Using D-Type Flip Flops for Toggling

buildscc | 15 Oct 2011 | | tutorials

When using momentary pushbuttons it is common to want to store and then toggle state. There are a couple of ways to do this, for example, you could using a 555 timer, or construct your own latch/flip-flop. However, the 7400 series of integrated circuits has a few nicely packaged D-Type Flip-Flops which are appropriate for switching. The most appropriate is the 74xx74, which is a dual D-type flip flop with inverted and non-inverted outputs. There are other packages like the 74xx174 which is a quad, but you will need to use your own inverter, such as the 74xx04 or 74xx14, to invert the output. Also the packages with more than 4 D-type flip-flops often share a clock, which means that this method of toggling will not work with them.

Contents

1 Parts and Tools 2 Lets Put it Together! 2.1 Schematic Diagram 2.2 Step By Step 2.3 Video Tutorial 3 Resources 4 Credits

Parts and Tools

Lets Put it Together!

Schematic Diagram

Step By Step

Video Tutorial

Resources

Credits

Christopher Woodall - chris.j.woodall gmail.com


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Meeting Minutes for 2011-09-28

09/28/2011

John-Nicholas Furst

  • Microsoft Imagine Cup
  • Microsoft Kinect
  • Solidworks

Valerie Young

  • Stairs

Kyle Brogle

  • How CTF Went
  • Who is doing stuff for Quinn?

George Silvis

  • Debian Knives

Kyle Brogle

  • Debian /Unbuntu Hackathon

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Hack an Orchestra

Overview

The Hack an Orchestra project will build an array of bizarre instruments.

More Information Coming

Current Instruments

  • Open 7400 Drum Machine: Drum Machine + 7400 Digital Logic ICs

Projects on Hold

  • Musical Gloves: Play music with gloves!

Mailing List

hackanorchestra-list@bu.edu

Wanna be on it? Email cwoodall bu.edu

Members

  • Christopher Woodall (Project Leader)
  • Darian