please help! how does the circuit work

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Discussion in 'General Electronics Chat' started by Harshit Agarwal, Jan 26, 2016.

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  1. Jan 26, 2016 #1
    Harshit Agarwal

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    Jan 26, 2016
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    hey.png
     
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  2. Jan 26, 2016 #2
    WBahn

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    What's the context of the question? Otherwise, "It works by applying 9 V between the top and bottom nodes," would be a valid response.

    Is this a homework problem?
     
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  3. Jan 26, 2016 #3
    crutschow

    Expert

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    It's an astable multivibrator as described here.
     
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  4. Jan 26, 2016 #4
    Harshit Agarwal

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    Jan 26, 2016
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    not a homework problem ,seen this somewhere and wanted to understand it
     
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  5. Jan 26, 2016 #5
    WBahn

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    So I would recommend taking a look at the link that crutschow posted, if you haven't already, and see if that satisfies you. If not, then by all means come back and try to post a question or three that get at what part of the operation is vexing you. That should provide much better targeted help to address your confusion.
     
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  6. Jan 28, 2016 #6
    hp1729

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    Assuming Q-left comes on first the collector moves toward +9 , discharging C-left, holding Q-right off. Eventually the capacitor drains and the resistor R-right pulls the base of Q-right to ground, turning it on. This discharges C-right, turning Q-left off. Eventually C-left discharges and resistor R-left turns Q-left back on which turns Q-right off ... all the magic is in the timing of the capacitors and the base resistors.
     
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  7. Jan 29, 2016 #7
    cmartinez

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    To me, this circuit is a perfect candidate for simulation in LTspice that the OP could use as a playground, so that he could see for himself what would happen if he were to change or tweak the values of the components, and learn something along the process.
     
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  8. Jan 29, 2016 #8
    hp1729

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    Emulate? Only ten parts. Build it.
     
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  9. Jan 29, 2016 #9
    cmartinez

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    That too :)
     
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  10. Jan 29, 2016 #10
    ronv

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    Easy for you to say. You have a scope. :D
     
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