Understanding emitter coupled Abstable multivibrator

Thread Starter

mguptamel

Joined Dec 14, 2012
37
Hi all electronic geniuses,

I was looking at circuit presented in link below.
http://www.hobby-circuits.com/circu...lasher/808/dark-activated-led-or-lamp-flasher

Above circuit uses "Emitter coupled astable multi-vibrator". However, I haven't found enough resources which explains inner working of above circuit. There are enough resources for Collector coupled astable multi-vibrator.

Would anyone be able to help me in understanding this circuit.

Thanks in advance
 

Thread Starter

mguptamel

Joined Dec 14, 2012
37
Trying to understand how Q2 (right most) turns-on and off? Text is saying Q1 runs in Cut-off & Saturation whereas Q2 runs in Active & cut-off respectively. Got the concept but haven't understood who to work out register values.
 

crutschow

Joined Mar 14, 2008
34,282
Below is a simulation showing some of the waveforms of interest.

If you want to do the LTspice simulation yourself (free program from Linear Technology) I can post the .asc file. That's a good way to help learn how a circuit works.

Mulivibrator.gif
 
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