LED Oscillator Circuit

Thread Starter

nqtraderman

Joined Oct 26, 2012
11
I've been looking at building this LED Oscillator circuit which alternately switches on/off the 2 LED's via the NE555 :

http://cindybob.com/halloween/circuits/ledoscillator.html

However I'd like it to flash at this rate and with a slight delay from switching off one LED to switching on the other :

http://youtu.be/ve-Rhc24-io

Can someone advise what needs changing in the circuit to do this ?

The ability to vary the flash rate with the potentiometer isn't needed and can be replaced with the relevant resistor value to fix it as necessary.

thank you
 

Audioguru

Joined Dec 20, 2007
11,248
The LEDs that blink for a short time use a very low average power supply current so a battery lasts for a long time.
But an old original 555 oscillator draws a fairly high amount of current all the time.
I made some Chasers and used extremely low power Cmos ICs instead of a 555 and each LED blinks brightly for only 30ms. The two or four AA alkaline cells last for months.

I have a Cmos oscillator (instead of a 555 oscillator) driving Cmos mono-stables that are made from Schmitt-trigger inverters.

EDIT: Try the original circuit like this and maybe with a little 9V battery:
 

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Thread Starter

nqtraderman

Joined Oct 26, 2012
11
Hi, thank you for the revised circuit.

With regard to your first comment re: eliminating the 555, I found this alternate circuit which might do the job however the LED's appear to behave with less of a "flash" then in the earlier 555 circuit :
http://startingelectronics.com/beginners/start-electronics-now/tut8-dual-LED-flasher/

If required, is it possible to modify this circuit to give more of an "off" delay between the LED's changing over ?

thanks for your help
 
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