NE556 transistor tester nor working

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Hi, i took on the net a circuit that use the 556 timer to test transistor. But the circuit is not working; the led's aren't blinking when power on. Some other person comments that the circuit is not working. What is the bug on the circuit or the parts?

**broken link removed**

Thanks

Michel
 
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carbonzit said:
Same here, no problemo.

Any comments on the "goodness" of this as a transistor checker? Guess it's pretty much a go/no-go tester.
Click to expand...

You can do what that 555 does and more testing of transistors by just using a decent ohm-meter
 
ericgibbs said:
You can do what that 555 does and more testing of transistors by just using a decent ohm-meter
Click to expand...

Yes, but this seems much more convenient. I'm thinking of building one with very small alligator clips. Very handy for quick go/no-go testing.
 
The circuit above will not work.
Pins 2 and 6 and pins 12 and 8 detect voltage levels and must be connected to a positive voltage via resistor. Pins 1 or 13 must be connected to the electro to discharge it. This means a number of connections and parts are missing.

Here is my simple version, that DOES work:

 
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