Single Chip Dice
A circuit for electronics dice is already published in www.electronicsproject.org. Here is single chip version (of course CMOS) of the same which offers touch switch facility.
Internal oscillator of IC1 is utilized here, along with the counter. When the touch pad is touched, input of the oscillator gets the signal processed by R1 and C1 through finger tip. So, it oscillates at a frequency determined by R1 and C1. Counter counts up to “101” and reset (due to D1, D2 and R2). R4 limit the LED current to around 4 mA.
Touch pad can be replaced by push button switch if desired. Optional components R7 and Buzzer comprise a “Watch Dog”. Note that B type IC is a must for the circuit.
Pin No. | ||||
4 | 5 | 7 | LEDs on | No. of LEDs glo0wing |
0 | 0 | 0 | All | 6 |
0 | 0 | 1 | LED3 –LED5 | 3 |
0 | 1 | 0 | LED3, LED6-LED8 | 4 |
0 | 1 | 1 | LED3 | 1 |
1 | 0 | 0 | LED4-LED8 | 5 |
1 | 0 | 1 | LED4, LED5 | 2 |
PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon)
R1 = 470 KΩ
R2 = 100 KΩ
R3 = 2.2 MΩ
R4, R7 = 1.5 KΩ
R5 = 1 KΩ
R6 = 680 Ω
Capacitor
C1 = 470 pF
Semiconductors
IC1 = 4060B
D1, D2 = 1N4148
LED1 – LED8
Miscellaneous
SW1 = On off switch
LS1 = Buzzer
Touch pad
9V battery