197
2.80 HF generator
Circuit 172:
Simple HF generator without inductor
Setup information
Install the two transistors, the four resistors and the three electrolytic capacitors as shown in
Fig. 2.172.
The
twelve jumper wires come next. Check the placement on the board again the battery.
Components required:
2 x 2N3904 transistors,
2 x 10 k
Ω
resistors,
2 x 22 k
Ω
resistors,
1 x 10 pF ceramic
capacitor, 1 x 100 pF
ceramic capacitor,
1 x 1 nF ceramic capaci-
tor, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.172:
Simple HF genera-
tor without inductor
Experiment
Our circuit generates HF oscillations entirely without the use of an inductor. The first and second harmonic
(at about 650 kHz and 975 kHz) can be received with any MW pocket radio.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.172.
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...
