A previous Design Idea describes a circuit that uses an astable multivibrator to drive an LED (Reference 1). The circuit in Figure 1 uses a simpler alternative approach. The circuit uses a 2N3904 NPN ...

The function of the 555 timer is mainly determined by two comparators. The output voltage of the them controls the state of the RS flip-flop and the discharge tube. It also contains 3 working states.

My teacher friend was looking for Christmassy technology ideas for a science + engineering club. And I said that flashing leds might be good, and if you can get three phases going, you can have a ...

Pondering how the three-way multivibrator worked in the way home, I decided that the base waveforms must be overlapping triangle waves – which would give a good reason for the nice 120° output ...