11/24/2023 0 Comments 10 second timer ic![]() ![]() The function of IC4 is to convert these binary signals into an appropriate sequence which can be interpreted as digital numbers over the attached 7 segment common anode display. These binary signals are fed to the pins 6, 2, 1, 7 of IC4 which is a decoder-divider IC. IC3 converts the divide-by-10 pulses from IC2 into binary coded output across its pinout numbers 11, 8, 9, 1, and 12. ![]() The divide by 10 pulses from IC2 is applied to pin#14 of IC3, which is a binary decimal divider IC. The counter and the display stage is built using IC3, IC4, IC5, IC6 and is used for showing the lapsed time intervals over a 2 digit 7 segment LED display. Each timing range has its own separate variable resistor or potentiometer which can be calibrated to further to breakdown each range into smaller time interval divisions. The circuit has a 3 way selector switch, which can be used for setting one of 3 timing ranges. However, if you want the output delays many times higher than this, then IC 555 could be replaced with a more accurate timer IC like the IC 4060, for enabling bigger selectable ranges which can be 10 times higher than the proposed ranges. IC2 also allows the timing capacitor C1 to be relatively smaller and compact. Thus, 1 second time periods from the IC 555 gets converted into 10 seconds, 10 seconds gets converted to 100 seconds, and 1 minute is scaled up to 10 minutes. The addition of the IC2 enables the design to produce reasonably longer time delays through an ordinary IC like the IC 555, since it converts the single pulse time intervals from the IC 555 into 10 times longer time intervals. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |