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circuit design

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steckel88

New Member
I have a project in my college electronics class and i have to design a circuit that has flashing leds in it.. i have to use the program multisim to simulate it and i have to use a lmc555ch timer.. i can use any other components
 

steckel88

New Member
ya thats sorta it... heres what i got so far and its not working...
 

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audioguru

Well-Known Member
Most Helpful Member
Why did you DOC it? It is not a written document nor a speech.
Why did you ZIP it? It should be a PNG file type.

You are using a Cmos 555 that has a very low output current.
Either increase the value of the current-limiting resistors or use an ordinary 555 that has much more output current. Add a transistor to the output of the Cmos timer to increase its output current.
 
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steckel88

New Member
the only 555 timers that we have in the multisim are lm555cm, lm555cn, lm556cm, lm555cn, lmc555ch, lmc555cm, lmc555cn, and tlc552c so which one of those would have a higher output, and the reason its in a doc is cuz i couldnt attach the multisim file so i put a copy of the circuit in microsoft word....
 

audioguru

Well-Known Member
Most Helpful Member
Look at the datasheet for an LM555 ordinary high output current IC.
Compare it to the datasheet for an LMC555 or TLC555 Cmos low current IC.

The TLC552 is a dual Cmos low current timer that works with a supply as low as only 1.0V.
 
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