117
2.38 Fireworks
Circuit 92:
LED firework
Setup information
Install the two transistors, the three LEDs from your experiment box, the four resistors and the two electro-
lytic capacitors as shown in
Fig. 2.92.
If you find another LED in your own hobby box such as a red one,
go ahead and use it. If not, simply use the IR diode from the experiments box. The nine jumper wires come
next. Check the placement on the board again and only then connect the battery.
Components required:
2 x 2N3904 transistors,
1 x red LED, 1 x yellow
LED, 1 x green LED,
2 x 1 k
Ω
resistors,
2 x 100 k
Ω
resis-
tors, 1 x 1 μF elec-
trolytic capacitor,
1 x breadboard, 1 x 9V
battery with clip con-
nector
Fig. 2.92:
LED fireworks
Experiment
Your LED fireworks start instantly, if everything is wired correctly. In quick succession, one pair of LED will
flash up. The effect is amazing, especially if you have a criss-cross arrangement, and even more so in a
darkened room.
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...
