178
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.
Components required:
2 x 2N3904 transistors,
1 x 1N4148 silicon diode,
1 x red LED,
2 x 1 k
Ω
resistors,
1 x 10 k
Ω
resistor,
1 x 100 k
Ω
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
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.
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...
