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PostPosted: 25.09.2004 15:23 
Shall I, if I want to use for example 2.2V LEDs, put a resistor at the +5v, before it enters the 555 ?, Thanks in advance

Excuse my bad english :oops:


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PostPosted: 25.09.2004 17:51 
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Ultra Modder
Ultra Modder

Joined: 09.06.2003 08:30
Posts: 1592
Location: Orlando, FL, USA
yea, that will work, just make sure the resistor has the right ohm value, to make sure the leds arent overpowered.

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PostPosted: 25.09.2004 17:57 
crash wrote:
yea, that will work, just make sure the resistor has the right ohm value, to make sure the leds arent overpowered.



Im not that much of a newbie ;), thank you

:lol:


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PostPosted: 25.09.2004 19:42 
Btw, If i have 10 1,7V LEDs, (30 mA) How shall i calculate the resistance then?


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PostPosted: 25.09.2004 21:24 
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Ultra Modder
Ultra Modder

Joined: 09.06.2003 08:30
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Location: Orlando, FL, USA
depends on how u hook them up. either serial or parallel. its better to hook them up in parallel. use Japala's Resistance Calculator to help ya calculate the resistance ya need.

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PostPosted: 26.09.2004 00:37 
Wait a minute... If only one LED is lid at the time, shall i only have resistance for one LED?


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PostPosted: 26.09.2004 04:24 
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Ultra Modder
Ultra Modder

Joined: 09.06.2003 08:30
Posts: 1592
Location: Orlando, FL, USA
oh, i was thinkin u wanted all 10 leds lit at the same time. umm... i think that each led would have to have its own resistor.


Japala, care to help me out here????

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PostPosted: 26.09.2004 05:50 
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Ultra Modder
Ultra Modder

Joined: 12.08.2003 04:52
Posts: 1633
Location: Maine
yeah each one is resistored independently, if you dont do that they will all light simultaneously, well because they would be connected in series

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