Single Chip Dice

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