Hf Generator - Maker Factory ELECTRONICS EXPERIMENTS BOX Manual

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.
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.
Components required:
2 x 2N3904 transistors,
2 x 10 kΩ resistors,
2 x 22 kΩ 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
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