BJT Astable Multivibrator

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BJT Astable Multivibrator

Postby neoply » May 23rd, 2017, 1:16 am

Hello all. Thanks for taking up your time to read my post.

I have the basic knowledge about multivibrators, but I did not understand the working principles of the circuit schematic provided down below.


I have done the basic research about how it works, but I could not understand this particular BJT Astable Multivibrator circuit. Could someone please explain why 470 ohm and 10K ohm resistors in the SN74LV123ANSRG4 as the datasheet of are used and why the outputs of the circuit are not the emitter legs of the transistor but the collectors of the transistors.

And the most important question is : I put LEDs to the outputs. Does that changes the duty cycle of the Multivibrator (or frequency) ?

Can anyone help me ? I am very puzzled about this question.
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