221
Circuit 196:
constant voltage source
Setup information
Install the transistor, the diode and the three resistors as shown in
Fig. 2.196.
The four jumper wires come
next. Last but not least connect the moving-coil instrument. Check the placement on the board again and
only then connect the battery.
Components required:
1 x 2N3904 transistor,
1 x red LED,
1 x 1 k
Ω
resistor,
1 x 2.2 k
Ω
resis-
tor, 1 x resistor (see
Experiment for value),
1 x moving-coil instrument,
1 x breadboard, 1 x 9V bat-
tery with clip connector
Fig. 2.196:
constant voltage
source
Experiment
Our circuit ensures a constant voltage at the output, even if load resistance and thus current draw changes
greatly. Output voltage is approximately 1.2V, if the load resistance value ranges between 100
Ω
and 10 k
Ω
.
The needle deflection of the moving-coil instrument remains virtually constant, even if different load resist-
ances in the range of 100
Ω
to 10 k
Ω
occur.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.196.
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...
