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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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 Images

555fig12.gif (3.3 KB, 9 views)

 

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

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Screen name: Aloone_Jonez

 

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)