#10 second timer ic portable#

#10 second timer ic portable#

My project, as well as many many others, need to be portable and battery operated so this won't do.Ī far less common approach is to use a GPS receiver. Aside from the hazards of working with high voltage AC, this ties you and your project to a wall socket. Actually the 555 Chip itself can drift with temperature.Īnother tactic is to extract the 60Hz signal from the AC power line and divide it down to 1Hz. The resistors and capacitors use to set the frequency are not all that accurate, and they drift with temperature. Probably the most common is to use an NE555 timer circuit set up for 1Hz, but there are problems with that approach. There are many ways to generate a 1Hz signal. To make the counter as accurate as possible I needed my 1 second counting period to be as accurate as possible. That circuit, in essence, simply counts how many pulses happen within 1 second. In my case, I wanted to build a very simple frequency counter. There are timers, time clocks, nixie and other real time clocks, and many others. There are many projects that require an accurate 1Hz clock signal, most involving the measurement of time, or controlling something based on time.

It's simple to add a crystal controlled 1Hz time-base to your timer, clock, stopwatch, or other time based projects. Hacker's Bench : Crystal Controlled 1Hz Time Base (Clock)Ĭrystal Controlled 1Hz Time Base ( Clock )Ī 1Hz time-base clock with the accuracy of crystal control.