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Electronics => Electronics => Topic started by: MangoBot on August 15, 2009, 05:09:58 PM

Title: Blinking LED
Post by: MangoBot on August 15, 2009, 05:09:58 PM

Link to datasheet and circuit: http://www.national.com/mpf/LM/LM555.html i go this timer IC and wanted to hook it up to two LED's in parallel, do would the first resistor be hooked up to the ouput, and then what is the symbol coming from the capacitor. The one with 3 lines all getting smaller? And should capacitors be the same value? And what value should the resistors be? And finally what goes into the trigger?

Title: Re: Blinking LED
Post by: SmAsH on August 15, 2009, 08:11:13 PM

by first resistor, do you mean for the leds?
the symbol with 3 lines is ground...
i have no idea about the other questions :-\

Title: Re: Blinking LED
Post by: MangoBot on August 15, 2009, 08:35:55 PM

no, the ones in the diagram, im using 330 ohm resistors

Title: Re: Blinking LED
Post by: billhowl on August 15, 2009, 09:47:53 PM

The circuit in the Datasheet is a Monostable Multivibrator Circuit or one short circuit, you can read more int here
http://www.ecelab.com/circuit-monostable-555.htm (http://www.ecelab.com/circuit-monostable-555.htm)

If you went to have a blinking LED, you need a 555 oscillator circuit. read here
http://hobby_elec.piclist.com/e_ckt5.htm (http://hobby_elec.piclist.com/e_ckt5.htm)
and here is the circuit to blink two LED.
http://datasheetoo.com/datasheet-application/wiring-555-ic-as-a-square-wave-oscillator-for-two-led-flasher-application.html (http://datasheetoo.com/datasheet-application/wiring-555-ic-as-a-square-wave-oscillator-for-two-led-flasher-application.html)