Electronics counter:-

Simple counting can be done by anyone but counting in interval up to large number is tedious and the chance of forget is maximum. As, we have already published Counter Circuit | Digital Counter. Now , here electronics counter is second project by dreamlover technology in the series of counting based project. Bothe the counting circuit published in this website counts up to 10,000 with the help of four seven-segment displays. The difference is previous circuit utilize CMOS ICs where the electronics counter use TTL ICs.

Circuit description

The entire circuit of electronics counter is divided into three main section :- input, display and driver or decoder section.

The input circuit consists of LDR following by negative square wave generator circuit build around Timer IC (NE555). A bulb is used here as light source focused on LDR. The property of LDR is that whenever the light focused on base of LDR is obstructed, it gives trigger and square wave is generated and given as input signal to counter circuit. So the objects to be counted are arranged in a row to move one by one in between the light source and the LDR.

 

IC₂ shows any number between 0-9 according to input square wave given to pin no 14. After each negative pulse a carrying pulse is produced by decoder IC and given to another one (i.e. from IC₂ to IC₃, IC₃ to IC₄, IC₄ to IC₅ ). IC₅­ and IC₆ is BCD to 7-segment latch decoder driver. The reset switch SW₁ is used to reset the electronics counter to 0000 states.

PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon)

R₁ = 1 KΩ

R₂ = 100 KΩ

R₃ – R30 = 180 Ω

VR₁ = 100 KΩ preset

Capacitors

C₁ = 4.7 µF

C₂ = 1000 µF/10V

C₃, C₄ = 0.1 µF

Semiconductors

IC₁ = NE555 (Timer IC)

IC_­2 – IC₅ = 7490 (Decade and Binary counter)

IC₆ – IC₉ = 7447 (BCD to 7-segment decoder)

IC₁₀ = µA 7805 (Voltage Regulator)

D₁ – D­₄ = Display FND 507

Miscellaneous

Mic₁ = Microphone

B₁ = Bulb

LDR

all the best..............................///////////////////////////////

..Read more http://electronicsproject.org/electronics-counter/