237
2.100 Detector receiver
Circuit 212:
Simple detector receiver
Setup information
Install the diode and the ceramic capacitor as shown in
Fig. 2.212
followed by the jumper wire. Last but not
least connect the Piezo element. Check the placement on the board again.
You can significantly increase the sensitivity of the Piezo element by using a sound plate or even a sound
box. Read more about it in Chap. 1.2.3
Components required:
1 x BAT85 Schottky
diode, 1 x 1 nF ceramic
capacitor, 1 x Piezo ele-
ment, 1 x breadboard
Fig. 2.212:
Simple detector
receiver
Experiment
A detector receiver is a bedrock in radio technology. This receiver circuit was already used a 100 years ago.
It signature is that no battery is needed for operation. The receiver and the headphone are merely powered
by a wire antenna, which should be as long as possible. A ground connection as short as possible is made
to a water line. Assumed that you are not living in a very remote area, you would be able to listen to the
nearest strong local broadcaster on LW or MW, while at night you could possibly receive a mix of several
broadcasters.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.212.
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...
