121
2.41 Chaotic flashing
Circuit 96:
Two LED in Waltz time
Setup information
Install the two transistors, the two LEDs, the four resistors and the three electrolytic capacitors as shown in
Fig. 2.96.
Finally, insert the 13 jumper wires. Check the placement on the board and only then connect the
battery.
Components required:
2 x 2N3904 transistors,
1 x red LED, 1 x green
LED, 2 x 220 k
Ω
resis-
tors, 1 x 2.2 k
Ω
resis-
tor, 1 x 1 k
Ω
resistor,
1 x 100 μF electrolytic
capacitor, 2 x 10 μF
electrolytic capacitors,
1 x breadboard, 1 x 9V
battery with clip con-
nector
Fig. 2.96:
Two LED in Waltz
time
Experiment
Even if everything is wired correctly, nothing will happen at first. It takes a while until the circuit moves into
gear. The small asymmetries need to charge an electrolytic capacitor first upon switching on so that one of
the transistors can switch through. But then the slow waltz kicks into gear.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.96.
Summary of Contents for ELECTRONICS EXPERIMENTS BOX
Page 4: ......
Page 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Page 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Page 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Page 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
