Astabler X5

160

01:39:27

On any given day at this site, one is likely to come across someone's version of the two transistor astable multivibrator Led flasher circuit. And they're all pretty much the same, because there isn't much room for variation. Yet they all seem to collect a lot of views. I don't however see anyone using the Segmented Astable Sequencing format. I twist and turn the layouts but all of my flasher circuits published here are based on this (simple but versatile) topology. Honestly I think it would be cool to see what someone else can dream up implementing this format. 
In the interest of helping things along, I present these two variations that have a clear and straightforward layout, with the hope that some of you will learn how it works and design a flasher of your own. I'm not the jealous type so, go for it! I have fun designing mine and even learned a few things along the way. I hope you do too!..

published 12 years ago

Sine_eyed

12 years ago

Of course, these circuits work better when they have some current flowing so flip that switch at the positive end of the power supply. Also, the X5 requires a shake of your device to start oscirevogyrilating. In previous examples I've always placed a switch between the negative terminal of the 1st segment capacitor and ground, but have omitted that step for these two examples. So give the tower some power, shake your moneymaker and we well have achieved Vegas baby..

faceblast

12 years ago

actually I've been trying to make a triple astable from discrete parts to hang on the Xmas tree. I have individual red, green and blue LEDs and I can't get the transition between the changes to go smoothly enough to gradually shift through each colour; it's always a rapid blink

Sine_eyed

12 years ago

Yeah I'm not sure if that can be achieved with this circuit- the transistors are either on or off. At home I made a little light sensitive meter with a transistor amplifying the current through a CdS cell. Had an LED after the emitter that got brighter as I approached any light source. I'm not sure how we could scale that up for your tree though without a clock and some logic or something. I bet Secuture has something up his sleeve- but then your Christmas tree might double as a ballistic missile lol!..

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