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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
You mean this chip? This chip which isn't available from any source even if you try to find it? Unless maybe you by 10 or so from an obsolete dealer. Last time I checked they want $72 each for it.
You could have gotten it ~10 years ago, but now you have to find it from Maxim, if that's even possible now, I don't know.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Actually Hazmatt, Maxim makes the chip I believe Marko is talking about, the icl7136cpl. I got 2 of them probably never gonna use them, but hey they WERE FREE samples from the company.
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
Heres my feedback on this thread. its a simple frequencycounter which is small and nice and accurately without using a microcontroller. everyone can build a frequencycounter with a microcontroller. who can build one without ? :P
The circuit uses a funny way to create 10mS count and 10mS display signal with a small reset impulse for the counter decade. the 3,2768mhz from the cristal oscillator is divided by 16384 to get 200hz then divided by 4 to get 50hz lol. well, you can read out the frequency in realtime every 1/50th second :)
Banned Registered Member #110
Joined: Fri Feb 10 2006, 12:23AM
Location: Banned City
Posts: 85
Anders M. wrote ...
Excuses, excuses. Here's a simple frequency counter using LED displays. Here's an other one. LCDs can be very cheap at ebay. A programmer can be as simple as two resistors. The argument about learning still holds.
Anders is right on all points. I did it all with discrete components long ago. Decided to evolve and will never look back. This project is nice but is neither new nor rare. I cannot bring myself to waste the board space of and waste 7 (16+ pins) ICs to do what I can do in a day with 1 cheap 18+ pin highly configurable and adaptable microcontroller procured for a few bucks or free from the Manufacturer.
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Frequency counting without a microcontroller
