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Registered Member #535
Joined: Sun Feb 18 2007, 06:03AM
Location:
Posts: 65
I have been trying to build this circuit for the last months 2 no avail. It makes 2 leds blink that you mount in glasses for hypnotism or study the effects on animals or plants with pulsed light. I am breadboarding this circuit. This is also my first 555 timer circuit. This circuit has minimum parts so I feel really dumb. The 555 timer is wired as an astable multivibrator. All I can get the circuit to do is both lights come on but they don't blink. thanks everyone.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Connect the diodes like this:
The NE555 has enough current to supply the diodes. I think your problem is that the 555 has too high voltage drop so it cannot turn off the transistors completely.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
Check that the value of C1 is indeed 1uF. If you've put a smaller capacitor in here the LEDs could flash much faster than you can see, giving the impression that they are both constantly on. Also check polarity if it is an electrolytic cap.
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need help on this 555 circuit please
