47
Circuit 22:
Flashing bicycle light
Setup information
Install the two transistors as shown in
Fig. 2.22.
Install the two white LEDs. If you do not have white LEDs,
use a green and a yellow instead. Now it is time for the four resistors and the two electrolytic capacitors.
Finally, insert the six jumper wires.
The circuit could be used as flashy bike tail light if the assembly is somehow water-resistant. Check the
placement on the board again and only then connect the battery.
Components required:
2 x 2N3904 transistors,
2 x white LEDs (not
included), 2 x 100
Ω
resis-
tors, 2 x 22 k
Ω
resistors,
2 x 10 μF electrolytic
capacitors, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.22:
Flashing bicycle light
Experiment
If everything is wired correctly, the two LEDs will start flashing alternately. This may attract more attention
than just a static light. It should be powered by a DC hub dynamo when used on a bike. Traffic regulations
must be observed.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.22.
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...
