233
The
high
state of the inputs is caused by closing the respective switch at the
high
position. In digital elec-
tronics such a circuit with the behaviour described above is known as NOR gate. A tablet or notebook PC
contains tens of thousands of those gates.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.207.
Circuit 208:
NAND gate with LED
Setup information
Install the two transistors, the four diodes and the three resistors as shown in
Fig. 2.208.
The seventeen
jumper wires come next followed by the jumpers, which serve as switches (shown dashed). For your guid-
ance we have labelled the switches with
high E1
,
low E1
and
high E2
,
low E2
. Check the placement on the
board again and only then connect the battery.
Components required:
1 x 2N3904 transistor,
1 x 2N3906 transis-
tor, 2 x 1N4148 silicon
diodes, 1 x BAT85
Schottky diode, 1 x red
LED, 2 x 1 k
Ω
resis-
tors, 1 x 10 k
Ω
resistor,
1 x breadboard, 1 x 9V
battery with clip con-
nector
Fig. 2.208:
NAND gate with
LED
Experiment
If everything is wired correctly, both “switches” are in the
low
position. The potential at the output is
high
;
the red LED is lit. The following table, also called truth table, shows what will happen now at the different
switch states.
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...
