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

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10107

Fig. 26: Circuit diagram Truth or Dare

Circuit Description

As in the above example, the IC1A together with the resistor R1 and the capacitator C1 functions as a cycle generator that controls the
counter here as well. The cycle is only applied to the cycle input of the counter while the button is pushed, however. At least one LED is
to be lit at all times. Therefore, the counter status is set to 1 via the input pins D0 to D3 when a low level is applied to the pin PL (11). The
counter reading 0 is not permitted and the counter is to be reset again after the number 3. Since it is a little difficult to build a running
light from a binary counter with few components, we have to use a trick. The alternative would be a decimal counter or an additional
binary-to-decimal-decoder. Once the number 4 is reached, Q2 switches to high and resets the counter reading to 1 again at once via the
inverter IC1D. Now three LEDs have to be controlled with 2 outputs (Q0 and Q1). If both outputs have a high level, it is the number 3. The
LED V3 is lit up via IC1B since the output switches to low and a current of V+ across V3 and R5 results. The low level at pin 4 of IC1B
causes a high level at the two LEDs V1 and V2 behind the inverter (IC1C). Since the outputs Q0 and Q1 have a high level at once, no
power will flow through the LEDs. The LEDs V1 and V2 are only lit when only one of the two outputs Q0 or Q1 switches to high. Only
then is a low level applied to pin 10 across IC1B and IC1C to permit current flowing through one of the two LEDs.

3.9 Reaction Tester

The reaction tester is about pushing the button as quickly as possible at a specific time. The LEDs are display the elapsed time and show
the time to reaction. The Reaction Tester works with two phases. The first phase is the waiting phase, during which the LEDs are
controlled relatively slowly. The counter status is displayed binarily via the LEDs (V3 = 1, V2 = 2 and V1 = 4). When passing from number
7 (all LEDs are lit) to 0 (no LED is lit), the second phase starts. Now the counter status is counted up very quickly and the LEDs are
controlled faster accordingly. Pushing the button can stop the count. The lower the displayed number, the better the reaction speed.

Fig. 27: Pinboard setup Reaction Tester

Circuit Description

For the circuit to work stably, a complete pass must be waited through. While the button is not pushed, the generated cycle of IC1A
across the resistor R2 is applied to the binary counter IC2 and the counter status is counted up. After the number 7 (Q0, Q1 and Q2 =
high), the number 8 follows, where only Q3 puts out a high level. This switches through the transistor T1 and connects the capacitator
C2 to ground. Now the two capacitators are switched in parallel and you will get a much longer time constant, due to which the counter
counts up relatively slowly now. Inside, the counter actually counts from 0 to 15, but only 3 LEDs are connected to the outputs, so that
the light emitting diodes make it look as if the counter were counting from 0 to 7 twice. The highest-value bit (Q3) only controls the
transistor and thus changes the time constant. From 8 upwards, the waiting phase is running, and the counter slowly counts to 15. After
15, the IC will start counting up from 0 again. In this condition, all outputs (Q0 to Q3) have a low level and the transistor T1 is locked.
This way, only the capacitator C1 is relevant for the time constant anymore. Now the counter counts up very quickly and the player can
stop the counter reading by pushing S1. When the button is pushed, a low level will always be applied to the cycle input (CPU) and the
counter will no longer count. After the button is pushed, the reaction time can be read on the LEDs.

10μ

100μ