Solving DRL Logic Problem: Get Help Here!

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Discussion Overview

The discussion revolves around a DRL (Diode-Resistor Logic) related problem, specifically focusing on the configuration and functionality of diodes in a circuit. Participants seek assistance in understanding the implications of diode orientation and circuit behavior, while also sharing resources and images for clarification.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses confusion regarding the orientation of output diodes, initially believing them to be in forward bias but later realizing they are in reverse.
  • Another participant points out that the provided image is not publicly viewable, prompting a request for a new link.
  • Participants share links to external resources that may contain relevant information, although some express uncertainty about their applicability to the specific problem.
  • Concerns are raised about the clarity of the images shared, with suggestions that the format makes it difficult for others to assist effectively.
  • A participant concludes that the circuit may be drawn incorrectly, noting that the diode's orientation could block output, and asks for input from classmates on the matter.
  • Questions are posed regarding the circuit's behavior under specific input conditions and the need for estimating resistor values.
  • One participant shares another image and asks about the function of additional diodes (D2 and D3), indicating a lack of clarity on their roles in the circuit.
  • Another participant suggests that the question about D2 and D3 may not fit the current thread's focus and recommends creating a separate thread for that inquiry.

Areas of Agreement / Disagreement

Participants express differing views on the correctness of the circuit drawing and the relevance of shared resources. There is no consensus on the function of D2 and D3, and the discussion remains unresolved regarding the specific questions raised.

Contextual Notes

Participants reference various external resources and images, which may have limitations in clarity or relevance. The discussion includes assumptions about circuit behavior that are not fully explored or agreed upon.

Ahmedzica
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Hi Guys,

I'm solving a DRL related problem

https://dl.dropboxusercontent.com/u/49829206/skitch.jpg

I though the output diode were in forward . but I suddenly noticed that it's in reverse .. so I couldn't handle the answer. can anybody help,please?
 
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Your pic is not viewable by the public.
 
oh Sorry ... here is it

https://dl.dropboxusercontent.com/u/49829206/skitch.jpg
 
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Ahmedzica said:
oh Sorry ... here is it

https://dl.dropboxusercontent.com/u/49829206/skitch.jpg

Just as a general note, when you ask someone to do you a favor (like answering a question for you), it's not really a good idea to make it difficult for them (by, for example, posting a picture sideways so that it is very hard to read).
 
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phinds said:
Just as a general note, when you ask someone to do you a favor (like answering a question for you), it's not really a good idea to make it difficult for them (by, for example, posting a picture sideways so that it is very hard to read).

yes you're right .. I'm sorry
 
NascentOxygen said:
Scroll halfway down through this http://site.iugaza.edu.ps/mjouda/files/EXP-3.pdf

I haven't read it, but it looks like they discuss it.

it isn't the same.. as they the anode of the output diode connected to voltage source
 
Ahmedzica said:
it isn't the same.. as they the anode of the output diode connected to voltage source
Ah, so it is. That causes me to conclude you have drawn it incorrectly, as I can see yours not functioning properly with that diode blocking the output. What do your classmates think?


attachment.php?attachmentid=58519.jpg



◗ Where you wrote Vcc - I1R, can you describe the path I takes through your circuit?

◗ For inputs 1 0 0 I'd be inclined to estimate Vx as a little higher than 0.7V to distinguish that condition from some others (such as 0 1 1). Can you account for this?

◗ You gave one resistor a value, do you need to estimate a value for the other resistor, too?

 

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  • skitch.jpg
    skitch.jpg
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This looks better: http://people.seas.harvard.edu/~jones/es154/lectures/lecture_7/DL_DTL/ls_dl.jpg
 
  • #10
NascentOxygen said:
Ah, so it is. That causes me to conclude you have drawn it incorrectly, as I can see yours not functioning properly with that diode blocking the output. What do your classmates think?


attachment.php?attachmentid=58519.jpg



◗ Where you wrote Vcc - I1R, can you describe the path I takes through your circuit?

◗ For inputs 1 0 0 I'd be inclined to estimate Vx as a little higher than 0.7V to distinguish that condition from some others (such as 0 1 1). Can you account for this?

◗ You gave one resistor a value, do you need to estimate a value for the other resistor, too?


yes that's what I thought.. I solved it as the one right here
http://people.seas.harvard.edu/~jones/es154/lectures/lecture_7/DL_DTL/ls_dl.jpg
 
  • #11
what do you think of this

https://dl.dropboxusercontent.com/u/49829206/Photo%20May%2006%2C%205%2007%2025%20PM.jpg

I've solved it but I can not know what is the function of D2 and D3, could you tell me,please?
 
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  • #12
Ahmedzica said:
what do you think of this

https://dl.dropboxusercontent.com/u/49829206/Photo%20May%2006%2C%205%2007%2025%20PM.jpg

I've solved it but I can not know what is the function of D2 and D3, could you tell me,please?
I don't know what the purpose of D2 is. But as this circuit does not fit under the heading "DRL Logic question" I think you should post it as a separate thread. Other students interested in this transistor logic would not find it under the current header.
 
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