Jumptuck
This project uses very few components to build a clever little analog blinker.
If you compare this schematic with the main image of the soldered version you can see it is the perfect circuit to solder without a circuit board since it's possible to lay everything flat with only one place where two wires cross.
For assembly I simply used the leads of the components with no added wire. I did take a piece of the insulation off of some wire to protect against a short where the two wires cross in the middle of the assembly.
Here's a demo of the circuit running:
And you might find it interesting to see the circuit simulation:
The oscilloscope output clearly shows the ramp of the base of one of the transistor and the square wave that results on one of the LEDs:
Bill of Materials
https://www.findchips.com/org/10-open-hardware/list/35514-astable-multivibrator
Jim Heaney
Matthew James Bellafaire
Alpenglow Industries
MaBe42
I've made a multivibrator astable as your, why when battery voltage fall down the frequency change? The lowest the voltage, the higher the frequency is. When it goes down a lot it also seems that both leds are simultaneously on with very low light.