[sdiy] traffic lights

[Ben Stuyts]

If you just want it to loop around, have look at ring multivibrators. These extend the basic 2-transistor multivibrator for more stages. E.g. this schematic from https://electronics.stackexchange.com/questions/678865/is-there-any-such-thing-as-a-tristable-quadristable-etc-multivibrator



Replace R2, R3, R4 with your light bulbs (and series resistor is needed) and adjust the capacitors to suit the required frequency.

Ben


> On 14 Dec 2025, at 14:58, david walker via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> Hello hope sum one can help but i got sum Grain of Wheat Bulbs 12V red yellow and green so you can see were i am going with them what i would like to does any have any simple designs like using a 555 or sum other essay to use compotes so make a set of traffic lights so any help would be a big thanks  
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