Lump In Gum After Broken Tooth

With 555 74LS90 With LDR

Well this LDR use a counter which gives us the advantage of being able to put a laser on where to cut the incidence of the laser and the RDA can increase your score is very easy to design and has potentiometer which can adjust the sensitivity of the meter.

Used Components.

- 3 CI 74LS90.
- 3 CI 74LS47.
- 3 Common Anode Display.
- 3 Ohm Resistor 100R 1 / 4 Watt.
- 5 Ohm Resistor 330R 1 / 4 Watt.
- 1 buttons.
- 1 CD CI 4093.
- 1 Led.
- 1 Potentiometer 50K Ohm.
- 1 LDR.