Conrad Course material 10107 14 years and over 10107 Manual De Usuario

Los códigos de productos

10107

3.4 Time Bomb

This game is a game for two or more players. In the Time Bomb game, you have to push the button for a short period. This "arms" the
bomb. Now the circuit is handed around among the players. At some point, the connected light-emitting diode will light up to simulate
explosion of the bomb. The player who is holding the circuit at that time has lost and has to leave the game. Then the remaining players
pass on the circuit again until only one player remains and has won the game.

Fig. 17: Pinboard setup Time Bomb

Circuit Description

The RC link of R1 and C1 implements a relatively high time constant. It takes about 100–130 seconds until the switching threshold of IC1A
has been reached.

V+

820k

100μ

IC1A

IC1B

3,3k

3.3k

BC547

Fig. 18: Circuit Diagram Time Bomb

When the button is pushed at the start of the game, the capacitator C1 will discharge very quickly and the voltage at the two inputs of
the NAND-gate is 0 V. The two gates work as an inverter because the inputs are connected. After releasing the button, the capacitator C1
is charged through the resistor R1 and the voltage increase. At some point, the switching threshold of the NAND-gate (IC1A) is reached
and the output level of gate A switches to low. The downstream inverter (IC1B) leads to a high level at R2. This way, the transistor T1 is
passed and the LED V1 lights up. To test the circuit, you can briefly pull out capacitator C1. Once the capacitator has been removed, the
LED will light up and you do not need to wait.

3.5 Cycle Trainer

The following example permits you to practice tapping out a specific cycle on the button. The Cycle Trainer requires the button to be
pushed every cycle the yellow LED lights up. If the button is pushed at the right time, the green LED will light up. If the button is pushed
while the yellow LED is not lit, the red LED will come on. This shows that the button has been pushed at the wrong time.