Oscillating Circuit Tester/Quartz Tester - Maker Factory ELECTRONICS EXPERIMENTS BOX Manual

2.73 Oscillating circuit tester/Quartz tester

Circuit 153: Oscillating circuit tester
Setup information
Install the two transistors, the two diodes, the three resistors, the fixed value inductor, the five ceramic
capacitors and the electrolytic capacitor as shown in Fig. 2.153. The 15 jumpers are next. Check the place-
ment on the board again and only then connect the battery.
Experiment
If everything is wired correctly, the red LED will turn on once the battery is connected. This tells you that the
oscillating circuit generates high-frequency vibrations. These are rectified and then displayed.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.153.
178
Components required:
2 x 2N3904 transistors,
1 x 1N4148 silicon diode,
1 x red LED,
2 x 1 kΩ resistors,
1 x 10 kΩ resistor,
1 x 100 kΩ resistor,
1 x 220 μH fixed induct-
ance, 1 x 100 pF ceramic
capacitor, 1 x 220 pF
ceramic capacitor,
1 x 1 nF ceramic capaci-
tor, 1 x 10 nF ceramic
capacitor, 1 x 100 nF
ceramic capacitor,
1 x 1 μF electro-
lytic capacitor,
1 x breadboard, 1 x 9V
battery with clip con-
nector.
Fig. 2.153: Oscillating circuit
tester