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    • #6862

      Hi all,

      What’s missing in the Lectron manual for the base and expansion set is a toggle flip flop.

      This flip flop has only 1 input and when activated, the output switches state.

      This is a real nice circuit to be used in different circuits where a certain state has to be “remembered”.

      It can also be used as a divider. It divides the input in 2. We will demonstrate this later.

      Here’s the circuit :

      Toggle flip flop

      A little remark here : for diode D1, use only the high current type (not the Ge diode) !

      By the way, this diode is only used here to substitute for a wire block 😛

      Everybody knows a flip flop but this circuit has a few changes. We have 2 capacitors C2 & C3 across the base resistors R4 & R8. These help switching the transistors faster than normal.

      Will the circuit still work without these ? Try it out !

      R6 & R7 are connected in series to match the value of R5.

      The circuit around S1, C1 and R2 create a short pulse to trigger the flip flop.

      T3 is is used as an emitter follower (high input resistance) so T2 is not affected.

      You can change the circuit into a stage with grounded emitter and the lamp connected to the collector.

      Will the circuit still work you think ?



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