1. Home
  2. Electronics Design
  3. detection / counter circuit

detection / counter circuit

I am new here. I know a good deal about regular voltage circuits, but little about electronic circuits. I need some of you electronic nerds out there to help me out. Here's what I am trying to do and the answer will be simple to you, so I'd appreciate it if you could give me some insight: I have a power circuit - 24 volts a/c. This circuit is not always energized, but only periodically. In the power circuit is a normally closed swiitch that opens periodically. The switch is before the load. What I need to know or create is a side circuit that bridges the switch. When the switch opens the side circucit would receive the 24 volt power. I need for this event to be counted on a small LCD or electromechanical totalizer or some other electronic combo that only you know about. It needs to be only 3 digits and resettable. It needs to be able to take temperatures of 20 - 120 degrees F. It will not be exposed to moisture, except humidity. The size needs to be no larger than a pack or two of cigerettes. It must be inexpensive and fairly resistant to minor vibration. What set up do I need to accomplish this task? I am thanking you in advance for your help! Thanks, Mike

Reply to
POSITRON
Loading thread data ...

How often would this be activiated? You can use this to charge a couple of batteries to power a micro with a LCD counter.

This should work:

formatting link

Reply to
linnix

This is what your description sounds like:

| 24 VAC --------------o | o---------------+ ----- | NC Switch * | LOAD | 24 VAC Return ---------------------------+

  • (when you push the button, it breaks the circuit)

And what you want is, when the switch is switched, you want your counter to increment.

That's not hard at all - get a "double-throw" switch - when it's in position 1, it connects terminal C to A, and when it's in position 2, it connectes terminal C to B. ("C" stands for "common".) So,

SPDT Sw. o---------------+ 24 VAC --------------o / | o---+ | | | COUNTER | | LOAD | | 24 VAC Return --------------+-----------+

There are mechanical counters that are activated by solenoids - it shouldn't take too much googling to come up with something.

Good Luck! Rich

Reply to
Rich Grise

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.