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Multivibrators: IC vs. Discrete versions

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Hey there!

I did learned many basic and intricate workings of Multivibrators inside the IC555 timer in my college - they are okay and quite understandable because of the R-S flip-flop thingy (I build a truth table for this) and the pair of comparators.

Unfortunately, the discrete versions AIN'T easy. The last part - Astable using 2 BJTs are horribly difficult to be understood. I know there's positive feedback inside these configurations, like the ones in Op-amps, but the discrete versions just made my head spin.

To be honest, I can build up all three types of multivibrators using IC555 myself with the aid of my knowledge, but NOT any of these discrete versions. :)

Anyone has experience learning the discrete versions of these Multivibrators in college? :D
 
Discrete multi-vibrators are really simple to understand, and I wouldn't class a 555 as a multivibrator at all.

In order to understand one, remove the capacitors (leaving two transistors and four resistors) and see if you can understand how that works?.
 
Nigel Goodwin said:
Discrete multi-vibrators are really simple to understand, and I wouldn't class a 555 as a multivibrator at all.

In order to understand one, remove the capacitors (leaving two transistors and four resistors) and see if you can understand how that works?.

I see. Now, in college, the 555 versions of these multivibrators are in my course syllabus. So I have to read 'em up and understand 'em.

Just to satisfy my curiosity, I wonder what's these multivibrators before 1971? That must be the discrete versions anyway I guess. Maybe in my free time I'll think about the discrete ones. :)
 
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