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555 Timer Question

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Robert McLean

New Member
Hi,
I have made the circuit here
470x260xStunGun.gif.pagespeed.ic.ex72EeUoD5.png

The circuit is fully made and working fine.

My question is about the type of 555 that is used. When I first put this together I used a "TS555CN" but when I was was playing about with input voltage I burnt it out. I tried replacing it with another (NE555) and it wouldn't work.
I know the TS555 is a low power 555 but should that really matter?

So my question in short is, why does the NE555 not work in the circuit I posted above.
Thanks.
 

Robert McLean

New Member
Yes it works fine again with the new TS555CN.

Through curiosity I have also tried another couple of brand new NE555's with the same outcome.
 

alec_t

Well-Known Member
Most Helpful Member
Did you get the NE555s from a reputable source? Could they be rejects/fakes? Do they work correctly in other circuits?
 

4pyros

Well-Known Member
Most Helpful Member
What are you getting at the base of the transister for each one?
 

Robert McLean

New Member
Did you get the NE555s from a reputable source? Could they be rejects/fakes? Do they work correctly in other circuits?
Yes I have used them in a ps3 controller mod recently.

I got the NE555's directly from texas instruments as a free sample a while back.
 

dr pepper

Well-Known Member
Most Helpful Member
The 10n is a bit small for a ne555.
 

dr pepper

Well-Known Member
Most Helpful Member
Fair enough, might be something else then.
The cap on pin5 on designs I've seen before has been 10n not 100n, but I wouldnt have thought that'd stop a ne555 and not a ts555.
 

Robert McLean

New Member
After checking the reading at the base of the transistor I found out that there was something wrong with my NE555's. This has been bugging me for about a week now so I decided to buy some new NE555's . Guess what, they worked! I know feel like an idiot. Somehow the timers must have been damaged, all eight of them.

I would like to thank everyone who responded.
 

dr pepper

Well-Known Member
Most Helpful Member
Dont worry about it, the more you mess with electronics the more weird unexplicable things happen.
Get a bag of 555's, they are the electronic enthusiasts staple.
 

DerStrom8

Super Moderator
Never trust anything you find on TalkingElectronics. They're all either stolen designs or very poorly thought out ones that in some cases can be downright dangerous. Personally, I'd recommend looking for a different circuit from another site, one that Colin DIDN'T make.
 

dr pepper

Well-Known Member
Most Helpful Member
It does seem more of a beginners site.
I built his fluorescent inverter for my van a while back and it worked.
 

DerStrom8

Super Moderator
It does seem more of a beginners site.
I built his fluorescent inverter for my van a while back and it worked.

I'm not saying his circuits don't work, I'm saying they're very poorly designed and in most cases won't last very long (if at all).
 
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