43
Circuit 18:
Boring double turn signals
Setup information
Install the two transistors as shown in
Fig. 2.18.
Install the two LEDs. Now it is time for the six resistors.
Finally insert the eight jumpers. 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 green LED,
2 x 1 k
Ω
resistors,
2 x 100 k
Ω
resistors,
2 x 220 k
Ω
resistors,
2 x 10 μF electrolytic
capacitors, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.18:
Boring double turn
signals
Experiment
If everything is wired correctly, the two LEDs will start flashing alternately after a certain run-up time. The
flashing frequency is at 2.5 Hz. This is basically the same circuit we used in the previous experiment. The
only difference is the value of the resistors; the ones charging the electrolytic capacitors are bigger.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.18.
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...
