Real hardware

A project log for 2 Transistor 4 state FlipFlop

This circuit with 2 transistors, 4 LEDs and a few resistors has four stable states !

roelhroelh 01/20/2019 at 08:531 Comment

Yesterday I did build the circuit (low power version). It actually worked the first time.

I did not use pushbuttons: instead of the S1 and S3 button, I simply touched the 15K - 2K2 connection with a wire to 5 volts, and instead of S2 and S4 I used a temporary wire to connect the low side of LED2 or LED4 to ground. So the 3K3 resistors connected to S2 and S4 were also not used.

The LEDs that I used did not respond well to the 0.5mA that th circuit provides. Raising supply voltage to 6 volt brought some more light (at 6 volt the circuit also worked well).


Yann Guidon / YGDES wrote 01/20/2019 at 17:47 point

Show us a video :-P

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