Flickering Light - Maker Factory ELECTRONICS EXPERIMENTS BOX Manual

2.52 Flickering light

Circuit 115: Flickering light
Setup information
Install the two transistors, the LED, the six resistors and the electrolytic capacitor as shown in Fig. 2.115.
Finally, insert the eleven jumper wires. Check the placement on the board again and only then connect the
battery.
Experiment
This circuit is a simple AF amplifier whose output is connected to a red LED. If you tap the input with your
finger, the LED flickers briefly. The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.115.
140
Components required:
1 x 2N3904 transistor,
1 x 2N3906 transistor,
1 x red LED, 3 x 1 kΩ resis-
tors, 2 x 10 kΩ resistors,
1 x 220 kΩ resistor,
1 x 10 μF electrolytic
capacitor, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.115: Flickering light