"Guessing" a circuit configuration with only the parts list.

Discussion in 'The Projects Forum' started by Zander98, Oct 16, 2015.

  1. Zander98

    Thread Starter New Member

    Aug 12, 2013
    4
    0
    Hi There!

    So, I've been searching the web for different kinds of circuit configurations to try and ID what the circuit could be just by looking at it. Anyway, a friend of mine is an electronics hobbyist like myself (except that he's way more advanced than I am), so he gave me a list of components, but not a schematic or name of the circuit configuration. He likes to stump me, and suffice it to say, I'm pretty stumped. This is the list:

    Op-Amp:
    2x LM741

    Resistors:
    2x 10k
    2x 1k
    1x 8.2K
    1x 5k Pot

    Caps:
    2x 0.01 uF
    2x 1 uF

    Diodes:
    3x 1N914
    1x Red LED
    1x Green LED

    I've searched a bunch, but I can't figure it out. Any suggestions would be awesome!

    Thanks in advance.
    -Zander
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,090
    3,027
    I'll speculate it's a flip-flop. The op-amp is configured as a square wave generator so that the red and green LEDs flash alternately. Without drawing the circuit, I'm not sure what the 3 1N914 codes would contribute. I could be way off.
     
  3. GopherT

    AAC Fanatic!

    Nov 23, 2012
    5,986
    3,726

    I was guessing a triangle wave generator circuit (one op amp is a square wave generator and one is an integrator). Again, the diodes are a mystery.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    atferrari likes this.
  5. Zander98

    Thread Starter New Member

    Aug 12, 2013
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    I'm equally as lost as you guys are. Been searching for a few hours now and I can't seem to find anything for it. It may not even be a circuit with any practical application, so it still eludes me.
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,090
    3,027
    I wonder if the diodes are used to alter the timing, as they are in 555 circuits, to give different charge and discharge rates on the timing capacitor.

    They could also be used to provide voltage references for a battery tester. One diode is 0.7V, light the red LED. Two diodes is 1.4V, light the green LED.

    What is the point of this exercise? Your "friend" is using the world's oldest available op amp. I'm not impressed.
     
    GopherT likes this.
  7. business_kid

    New Member

    Feb 5, 2013
    22
    1
    Wayneh is right. The 741 is pure crap, the sort of thing for hobbyists to make smoke with. Save your brain for more useful pursuits. Anyone who has info and withholds it is a PITA.
     
  8. wayneh

    Expert

    Sep 9, 2010
    12,090
    3,027
    That made me chuckle, since an acronym is one way to withhold information. :p I know the acronym, but the TS may not.
     
  9. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    Is that Pita Bread, :p
     
  10. Roderick Young

    Member

    Feb 22, 2015
    408
    168
    What? I like puzzles.
     
  11. Zander98

    Thread Starter New Member

    Aug 12, 2013
    4
    0
    Read the first post =).
     
  12. RichardO

    Well-Known Member

    May 4, 2013
    1,230
    382
    I am guessing that there are 17 factorial possible guesses -- so keep trying guys. ;)
     
  13. GS3

    Senior Member

    Sep 21, 2007
    408
    35
    Over / under voltage detector.
     
  14. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,645
    759
    What a waste of time!
     
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