Maker Factory ELECTRONICS EXPERIMENTS BOX Manual page 159

Input 1 Input 2
low low
high low
low high
high high
The states high and low at the inputs are achieved by toggling the respective switch. Unlike the previous
experiment, the states must be manually wired. In digital electronics such a circuit with the behaviour
described above is known as NAND 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. 3.135.
Circuit 136: NAND gate with moving-coil instrument
Setup information
Install the transistor, the three diodes and the four resistors as shown in Fig. 2.136. Then insert the four
jumper wires followed by the jumpers, which serve as switches (shown dashed). For your guidance, we
have labelled the switches with high E1, low E1 and high E2, low E2
Last but not least connect the moving-coil instrument. Check the placement on the board again and only
then connect the battery.
Output LED
high dark
high dark
high dark
low illuminated
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