Digital Electronics

  • Thread starter kuchun
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  • #1
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I want to know the BJT implementation of flip flop with the help of proper circuit diagram..
 

Answers and Replies

  • #2
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There are RS (set-reset) flip flops, D flip flops, JK flip flops, and maybe a few others that have no useful function or advantage over those already given.

Which one did you have in mind?

As BJT technology has waned over the past couple two or three decades, given over to MOS technology, you may have trouble finding an online BJT equivalent circuit for a flip flop of any sort.
 
  • #3
vk6kro
Science Advisor
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If you go to Google and set it to IMAGES, you can get lots of flip flop circuits.

The common one used as a divide-by-2 is the bistable flip flop.

images?q=tbn:ANd9GcTcsLvIo8sICs6dHB-gFBMkXjGhA0_Sf1BeipSmgXv0ogK3GnHWOA.png


As you can see, it uses a lot of components and also requires careful adjustment of the bias resistors. After that, it is quite reliable. I know of one that was made in 1972 and is still operating.

These days you would certainly use an integrated circuit.
 
  • #4
11
1
There are RS (set-reset) flip flops, D flip flops, JK flip flops, and maybe a few others that have no useful function or advantage over those already given.

Which one did you have in mind?

As BJT technology has waned over the past couple two or three decades, given over to MOS technology, you may have trouble finding an online BJT equivalent circuit for a flip flop of any sort.
I want to know the BJT implementation of RS flip flop....Thanks for ur reply
 
  • #5
11
1
If you go to Google and set it to IMAGES, you can get lots of flip flop circuits.

The common one used as a divide-by-2 is the bistable flip flop.

images?q=tbn:ANd9GcTcsLvIo8sICs6dHB-gFBMkXjGhA0_Sf1BeipSmgXv0ogK3GnHWOA.png


As you can see, it uses a lot of components and also requires careful adjustment of the bias resistors. After that, it is quite reliable. I know of one that was made in 1972 and is still operating.

These days you would certainly use an integrated circuit.
Thanx for your reply....it was really helpful for me....Can u suggest me some good books on digital electronics, I am at beginner level..
 
  • #6
vk6kro
Science Advisor
4,081
40
You could read this description of R-S flip flops:
http://www.hobbyprojects.com/flip_flop/a_transistor_RS_flip_Flop.html

It describes this circuit:

trflop.gif


I have several books on digital techniques, but most of them are pretty old and possibly unavailable now. I wouldn't really recommend any of them.

This is a topic where you really need to get into a class and have someone cover it for you in a logical way.

That site above is part of a bigger tutorial on digital devices here:
http://www.hobbyprojects.com/flip_flop.html#flip-flop
It seems quite well done and you might like to start there.
 
  • #7
4,239
1
The common one used as a divide-by-2 is the bistable flip flop.

Good grief. I've so long heard flip-flop and bistable flip-flop used synonymously that I don't recall every hearing the term "monostable flip-flop" used-- I had to look it up to see if it really was the same thing as a one shot.
 

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