Conrad Course material 10107 14 years and over 10107 User Manual

Product codes

10107

3.12 Gambling Machine

Gambling Machines can be found in many pubs and, of course, in Las Vegas. These machines require pushing a button and waiting until
the symbols or rotating discs have stopped. If a specific combination is displayed, you receive a prize. There is also a mode where you
can multiply your winnings. For this, a button and a display for the multiplication flash alternatingly. If the button is pushed at the right
moment, you get to the next multiplication level. If you push at the wrong moment, your winnings are lost. The following circuit shows
this mode. LED V1 flashes slowly and the button has to be pushed every time the LED is lit. Only then will the counter be counted up. If
the button is pushed when the light emitting diode is not lit yet, the counter will be reset and the winnings will be lost.

Fig. 33: Pinboard setup Gambling Machine

Circuit Description

The cycle is generated with the IC1A via the resistor R1 and C1. If the cycle has a high level, a current will flow across R2 and the light
emitting diode V1 and make it light up. At the same time, the transistor T2 is also passed through via the resistor R4 and ensures a low
level at the reset pin (MR). Via the inverter IC1B, a low level is applied to pin 4 and the transistor T1 is high-Ohmic. The cycle input (CPU)
is connected to ground via the resistors R5 and R7. This changes once the button is pushed. Then the cycle input is connected to the
supply voltage via R5 and a rising flank results that counts up the counter reading.

10μ

100μ

V+

IC1A

100k

IC1D

3,3k

3.3k

IC1C

IC2

IC1B

VDD

CPU

CPD

GND

TCU