Hi all,

Since I got myself a Legacy Lectron set, time to covert this nice circuit to Ge transistors.

I was browsing through the Braun student manual and found this exercise n° 11.53.

But since it uses many duplicated blocks, not included in a standard Legacy set, I made small modifications to the circuit.

And this circuit rocks ! After each press of the switch, the light bulb switches state from on to off etc.

Legacy toggle flipflop

Now some questions for the true Lectroneers !

  • Each time we connect the battery. Will the lamp be on or off ?
  • What is the function of the 2 diodes ?
  • Will the circuit still work if we use 0,1 µF capacitors instead of the 10 µF ?
  • If we replaced R1 with a light bulb in series with a 47 Ohm resistor. Will the circuit still work ?

The answers can easily be found after building the circuit.

Good luck !