Reflex Timer Circuit

Posted on Aug 8, 2012

This timer circuit uses a 555 IC timer and three 74LS193 counters to drive an LED display. SI is activated by one person, who turns on piezo buzzer BZ1 via Ql and also starts the clock; SI is activated by the other person being timed.

Reflex Timer Circuit
Click here to download the full size of the above Circuit.

This shuts off the timer, and the number of LEDs lit indicate, in binary form, the elapsed time.

Leave Comment

characters left:

New Circuits



Popular Circuits

Stand-by power for non-volatile cmos rams
Lights-On Reminder Circuit
Super Reverb circuit
How to use SPI (Serial Peripheral Interface) in AVR Microcontrollers
AT89C2051 Real Time Controller
DIY TCI + CDI Trigger
Camera external shutter circuit 555 timer
A DC power supply boost circuit
Audio signal control circuit
100W full-wave single-junction transistor trigger doer control circuit
0-90 phase shifter circuit diagram
Flooding rats Electronic cat