Lc Generator - Maker Factory ELECTRONICS EXPERIMENTS BOX Manual

2.83 LC generator

Circuit 179: HF generator 150 kHz
Setup information
Install the transistor, the four resistors, the four ceramic capacitors and the fixed value inductor as shown
in Fig. 2.179 followed by the eight jumpers. Check the placement on the board again and only then connect
the battery.
Experiment
This circuit generates HF radio waves at a frequency of about 150 kHz. A portable LW radio makes the radia-
tion audible. This is a standard circuit in analogue receiver technology and known as Colpitts oscillator.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.179.
204
Components required:
1 x 2N3904 transistor,
2 x 10 kΩ resistors,
2 x 22 kΩ resistors,
1 x 1 nF ceramic capaci-
tor, 2 x 10 nF ceramic
capacitors, 1 x 100 nF
ceramic capacitor,
1 x 220 μH fixed induct-
ance, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.179: HF generator
150 kHz