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schematic for 5 LED chaser circuit using 555 chip

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radiant777

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Hi,
I'm looking for schematics to create a 5 LED chaser circuit using a 555 chip. Anyone know of one?

radiant777
 
Thank you colin55

I am restoring some old pachinko (10) machines and I came to the forum looking for some simple 555 and flip flop circuits to add electronic lighting effects to "modernize" the games. I'm collecting quite a few for different aspects of the game - i.e. idle, flipper shot, flowers open, winning shot etc. I have a few hundred LED's, 20 LM555's from an ebay purchase on the way and I'm putting in an order with All Elecronics for he other components.

Thanks for the addition!

ShockSystem
 
Hi All,
Very new to this site!
I'm o.k. with the schematic, but in my ignorance, if I only use 5 LEDS, do I just leave pins open on 4017 or do I have to connect them to 'something'? I only want five for a model fire engine I'm building and it sits on the rear pump compartment in a five set 'window'
Thanks for any help

ICEMAN66
 
5 LED Chaser

Ideally forwards. No. 1 on, off; No.2 on, off; etc. Then once No.5 has sequenced, No.1 to start it all over again.
I'm already using a pair of 555's on a strip board buried in the 'tank' to control the blue lights, hazards etc. Headlights are handled by GOW bulbs on a separate 3v supply.
:)
 
With a supply of only 5V, the CD4017 has an output current of typically only 2mA to 3mA so the LEDs will look dim.
Use a 9V supply and the current is 14mA.
Use a 5V or 6V supply with a 74HC4017 and you need current-limiting resistors to limit the current to 25mA so the LEDs are nice and bright.
 
Timer in a timer?

Hi All,
AudioGuru - thanks for that info. It raise two more, possibly silly, questions.

1/ The model will only get lit for maybe 2 to three minutes at a time, will a current of 25mA give me a reasonable (how long's a piece of string!)life span on the LED's?

2/ Is there a way of utilising either the 555's or the 4017 to allow a push of a microswitch to activate all the model functions and then run all for a period of time, then stop until the microswitch is pushed again?
I'm thinking that if I upped the electrolytic on the 'incoming' 555, it might allow me the delay I need, but I'm green and probably wrong!
Or do I need to build something else?

Sorry but I'm only just starting on PIC and it's way beyond me!

Thanks for helping the 'newbie'.

Iceman66
 
iceman66 said:
1/ The model will only get lit for maybe 2 to three minutes at a time, will a current of 25mA give me a reasonable (how long's a piece of string!)life span on the LED's?
Click to expand...
Most LEDs have a max allowed current of 30mA, look on their datasheet.
When they are used within their max allowed current then they last for hundreds of thousands of hours. Chinese ones from E-Bay last only 1 week (168 hours).

2/ Is there a way of utilising either the 555's or the 4017 to allow a push of a microswitch to activate all the model functions and then run all for a period of time, then stop until the microswitch is pushed again?
I'm thinking that if I upped the electrolytic on the 'incoming' 555, it might allow me the delay I need, but I'm green and probably wrong!
Click to expand...
A push-the-button to turn on a circuit then push-the-button again to turn off the circuit is simple. But it needs additional parts to provide enough current for your circuit.
 
I've bought 100 packs of bright white and some RJB LED's from e-bay, hong kong origin, they were all quality LED's.
 
If you want a push-on arrangement to run the circuit for 10 - 60 seconds or so, you need a hex schmitt trigger and some components.
 
Last edited:
When it has a 5V supply, a CD4017 has a very low output current which causes the LEDs to look dim. Use a 74HC4017 with a 5V supply then the LEDs will be nice and bright if the 330 ohm resistor value is reduced to about 120 ohms.
 
can u post a scematic?
and how about the other 2 with 8 LEDs?They have to do both the same, its for a casemod where left and right side have 8 LEDs
btw: power supply is max 2 USB cables for all the LEDs so the 5 and the 2x8
Grtzz
 
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