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Constructing a "delay" into a system?

OK I can solder, and 50 years ago took an RCA Electronics course so I could fix b&w TV's. Since then, not too much electronical has happened around me!

I now fly some lightweight, foam Radio Controlled airplanes Every now and then, due to "operator error"... I put one down in a cornfield or some other undesirable place. Finding the darn things can be a problem.

Some people have purchased a "beeper" that sounds off when the plane stops running. They run about $15.00 each. I have six planes...I'd rather build my own if I can do it cheaper and it would work the way I want it to.

I read about another guy putting a buzzer/beeper into his plane that beeps all of the time. I don't want to hear a beeper going all of the time, but wouldn't mind an intermittent "beep" every now and then. Today, I visited my local Radio Shack, where they sell things, but they actually don't know anything about them.

I bought a 12 vdc ( range 3.0 to 20 vdc) 10ma..at 12 v beeper item #06P08 or maybe #273-0059. It has a great sound when plugged into my 8 volt Lipo battery. Its single "beep"would do the job...if....

Now, what I need is some way to time that beeping. What is the simplest circuit that I could solder up; connector my motor's battery when I get ready to fly...and have it "beep" intermittently while flying? Thanks for any help. regards, Rich

Reply to
richg99
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You could build this circuit:

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It will work from 12 volts. Substitute the buzzer for the LED in the diagram.

Alternatively, this idea might work for you: put a blinking LED (Radio Shack #276-312) in series with the buzzer.

Ed

Reply to
ehsjr
[snip

An 8-pin 555 timer IC, two resistors and two caps, will do it:

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The 'astable oscillator' schematic is the one you want.

Googling on '555 timer' will find you all kinds of info on this really versatile device.

HTH

Reply to
Randy Day

I flew an RC model aircraft into a stand of woods near my home. The controller had the tail motion reversed, and it went over a bunch of trees and crashed into a fairly large area of trees. I was looking for it by occasionally revving the motor, which I could hear in the distance. I managed to find it hanging from a branch on tree on a 45 degree slope. I was able to dislodge it, barely.

So, I feel your pain.

However, compare the cost of the $15 beeper against the cost of the aircraft. In fact, it costs less than a battery pack. You also need to ensure that it won't drain your battery, beep all the time, and that it'll actually be loud enough to use to find the thing.

Regards, Bob Monsen

Reply to
Robert Monsen

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The dollar stores here have watchfob gizmos that respond to a whistle by beeping loudly (to find your keys if they're misplaced). With the money you save, a boating store will sell you an air horn to interrogate your downed aircraft in style.

Reply to
whit3rd

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