66
2.16 Electronic potentiometer
Circuit 41:
Electronic level control with large control range
Setup information
Install the two transistors and the five resistors as shown in
Fig. 2.41.
Then install the ceramic capacitor and
the two electrolytic capacitors, followed by the eight jumper wires. Finally connect the Piezo element. Check
the placement on the board again and only then connect the battery.
You can increase the sensitivity of the Piezo element significantly by using a sound plate or even a sound
box. Read more about it in Chap. 1.2.3
Components required:
1 x 2N3904 transistor,
1 x J111 FET transistor,
1 x 100 k
Ω
resistor, 1 x 10
k
Ω
resistor, 1 x 4.7 k
Ω
resistor, 1 x 2.2 k
Ω
resis-
tor, 1 x 1 k
Ω
resistor,
2 x 10 μF electrolytic
capacitors, 1 x 100 nF
ceramic capacitor,
1 x Piezo element,
1 x breadboard, 1 x 9V bat-
tery with clip connector
Fig. 2.41:
Electronic level con-
trol with large control range
Experiment
With an electronic level control you can define the weakening of an audio signal by means of a control
voltage value. In our case, at 0 V control voltage, the audio signal will be amplified by the factor 10; at
-7V control voltage, it will be muted by factor 1.000. The maximum output voltage is about 1 V. As sources
for (negative) control voltage you could use batteries such as 1.5V, 3V, 4.5V batteries or a suitable variable
power supply.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.41.
Содержание ELECTRONICS EXPERIMENTS BOX
Страница 4: ......
Страница 251: ...253 Fig 3 27 Circuit 27 4 seconds switch off delay Fig 3 28 Circuit 28 20 seconds switch off delay...
Страница 258: ...260 Fig 3 42 Circuit 42 Active 8 5V battery monitor Fig 3 43 Circuit 43 Active 7 8V battery monitor...
Страница 260: ...262 Fig 3 46 Circuit 46 Meters for 1 5 V Zener diodes and higher Fig 3 47 Circuit 47 Discreet 2 2V Zener diode...
Страница 261: ...263 Fig 3 48 Circuit 48 Discreet 2 9V Zener diode Fig 3 49 Circuit 49 Discreet 3 7V Zener diode...
Страница 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Страница 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Страница 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Страница 290: ...292 Fig 3 118 Circuit 118 HF watch dog with LED indicator Fig 3 119 Circuit 119 HF watchdog with moving coil instrument...
Страница 295: ...297 Fig 3 130 Circuit 130 4 seconds switch on delay Fig 3 131 Circuit 131 15 seconds switch off delay...
Страница 298: ...300 Fig 3 136 Circuit 136 NAND gate with moving coil instrument Fig 3 137 Circuit 137 Input level Mixing console...
Страница 300: ...302 Fig 3 140 Circuit 140 Electrometer with moving coil instrument Fig 3 141 Circuit 141 Simple AM Radio...
Страница 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
Страница 324: ...326 Fig 3 202 Circuit 202 3 seconds switch on delay Fig 3 203 Circuit 203 7 seconds switch on delay...
Страница 325: ...327 Fig 3 204 Circuit 204 Piercing siren sound with Piezo element Fig 3 205 Circuit 205 Discrete Operational ampli fier...
Страница 328: ...330 Fig 3 210 Circuit 210 Discreet 5 2V Zener diode Fig 3 211 Circuit 211 Discreet 7 4V Zener diode...
