AHHHHAAA Got it! NE555V for the DIP and SE555T for the metal can version


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-BaC

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I bet they're worth a bit of money.

I've got some metal can µA741s but I've never seen a metal can NE555 before.

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I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

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The above link is a good one and I like this site for its calculator.

http://ourworld.compuserve.com/homep...Bowden/555.htm

 

I have build a circuit (shown in the attachment) from one of the tutorials above and am now playing around with the timings by changing the values of R1 and R2. What I want ideally is a short on time (say 1 second or less) and a long off time (say 5 seconds or more). But at the moment I seem to only be able to increase or decrease them both - any ideas?

Attached Thumbnails

 

 

If you just want to power an LED then connect it from pin 3 to +V instead of 0V.

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I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

 

I also like ecelab.com/circuit-astable-555.htm when you get better it has formulas for finding the frequency of the square wave

 

Tony vanRoon's site from Univ. of Guelph is without a doubt the most colorful electronics site on the Internet! It's very pretty!

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Ditto on that tut

Thought I had deja-vu for a moment. If I started searching on that Can part number again, I would have just walked away.....lol Email alerts can be confusing it seems..haha

-BaC

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thanks for the tutorials. really useful

 

Absolutely, it got me started with Digital electronics (I did a simple counter thingy, working with the 74LS47 and the 74LS90, with the ne555 providing the Astable)

 

who needs a round 555 timer????? its 2008

 

Nice one Usif, takes me back to my childhood, building binary up/down counters-to-7 segment displays, my mother would show off to her friends with my magical creations

 

Who needs a 555 now that microcontrollers are cheap.

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Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com/

 

thanks for sharing the info, i found it useful

 

Last time I checked, the cheapest 555 is cheaper than the cheapest micro and can directly drive relays

If all you want to do is flash an LED, beep a piezo or turn a relay on for ten seconds a 555 is perfect. I wouldn't even consider a micro for something so basic, unless there are other requirements.

__________________

I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.