555 madness - Page 1
Forum section: electronics / beginners

author: noah_fakelastnamelike_bob
author_rank: Regular Contributor
timestamp: February 22, 2014, 04:47:23 am
content: http://www.digikey.com/product-detail/en/NE555P/296-1411-5-ND/277057http://www.digikey.com/product-detail/en/LM555CN/LM555CNFS-ND/458696http://www.digikey.com/product-detail/en/TLC555CP/296-1857-5-ND/277502why do we need so many kindswhats so different about them witch one do i need to get for 5 leds

author: sacherjj
author_rank: Frequent Contributor
timestamp: February 22, 2014, 05:26:14 am
content: If you are running the 555 circuit from a battery, go with the LinCMOS version (TLC555CP) as the current draw of the device is MUCH less that earlier designs. You lose a little on drive current, but still more than you probably need.Not sure by "5 leds", you would need to actually describe what you are trying to do with it.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 22, 2014, 05:27:00 am
content: NE555: original (IIRC)LM555: National Semi's versionThese are all the same. Different manufacturers put their own lettered prefix on the number. The suffix usually denotes package (P, D, N, etc. variously denote PDIP according to the manufacturer's own naming scheme).TLC555: CMOS version; see also 7555, LMC555, etc. Low current version.CMOS version is much weaker and probably won't drive 5 LEDs (with resistors, right?) on its own. Get a regular 555 variant.Tim

author: noah_fakelastnamelike_bob
author_rank: Regular Contributor
timestamp: February 22, 2014, 05:44:06 am
content: just make it blink 5 leds at onceand nohttp://www.digikey.com/product-detail/en/3352H-1-503LF/3352H-503LF-ND/1088325and what batterie what would be the best batteri i could use for it (1 1/2 inch ) i want them to last a long time would i plug it in charge it and wuold it be easier

author: noah_fakelastnamelike_bob
author_rank: Regular Contributor
timestamp: February 22, 2014, 05:48:13 am
content: p.s i will be selling these for about 3 us $ because i could (with my design for power for led post & this ) make lots of money. most of the people at my school are idots and will buy anything

author: electronics man
author_rank: Frequent Contributor
timestamp: February 22, 2014, 07:57:04 am
content: What are you going to use the pot for (to adjust the output of the 555?)

author: noah_fakelastnamelike_bob
author_rank: Regular Contributor
timestamp: February 22, 2014, 08:15:23 am
content: Uh yea

author: amyk
author_rank: Super Contributor
timestamp: February 22, 2014, 08:54:08 am
content: Quote from: T3sl4co1l on February 22, 2014, 05:27:00 amThe CMOS version is also rated to go to a higher frequency, not that it matters much in this application...here is the die of one.

author: noah_fakelastnamelike_bob
author_rank: Regular Contributor
timestamp: February 22, 2014, 09:21:57 am
content: after looking at this picture i am handicapped in 9 ways. like whatttttttttttttttttt wowp.s sorry if i offended any one

author: edy
author_rank: Super Contributor
timestamp: February 22, 2014, 12:53:18 pm
content: For what its worth, I found that if you are buying initially to prototype and learn (which I assume you are at this stage) then getting a kit is easier than trying to purchase individual components which have different specs and applications. The kits are designed to be user friendly.For example, I bought this in the past which includes a 555 timer and a bunch of other parts which you can do many projects with:http://www.atomsindustries.com/Pro-Electronics-Project-Starter-Kit_p_95.htmlI would look for kits from Adafruit, Sparkfun, Atoms Industries, and tons of places online. If you are North America, most of them have eBay stores as well with free shipping. For example, the kit I bought above (they also sell Arduino and sensor kits) are fairly cheap and they do all the work of selecting a good "starter bag" of various components.

author: noah_fakelastnamelike_bob
author_rank: Regular Contributor
timestamp: February 22, 2014, 07:06:16 pm
content: as i am not trying to learn about '555 TIMER" i was more looking at the name and whats diffrent about them but i will have to buy that thank you.

author: sacherjj
author_rank: Frequent Contributor
timestamp: February 22, 2014, 07:49:06 pm
content: Quote from: noah_fakelastnamelike_bob on February 22, 2014, 07:06:16 pmAs with finding out what is the difference is between these chips (and all chips you will run into in the future), read the datasheet. That is almost always the answer.

author: edy
author_rank: Super Contributor
timestamp: February 23, 2014, 01:21:29 am
content: If you upload your schematic showing how you plan to use the 555 Timer with the 5 LEDs and what power supply, it will help us narrow down the types of components that will work together. The datasheets show different voltage supplies needed, current output available, and so on. How do you plan to light the LEDs? Are you doing some kind of pattern or just all of them on and off? Will you need other ICs involved to produce your LED patterns?

author: noah_fakelastnamelike_bob
author_rank: Regular Contributor
timestamp: February 23, 2014, 04:21:21 am
content: i will have a matt this mat will have pads that hook up to the cubes and the cubes them selves will have magnets so i cant hook it up wrong and pads on the top to transfer power to the next one. the cubes will only hold a transistor (so it will only take the power it needs and sends the rest to the next one) and leds. the mat will also be using my power for leds project.the 4 modes the mat will have isoffon - adjustable brightnessblinkingmusic(any ideas for what else)the mat will look like this on its top-------------------------------------------------------------------------------audio plug ](on off lever) ( brightness adjusting wheel) blinking/music switch ]-------------------------------------------------------------------------------the true size of that will actual be like 1 inch wide and 4 inches longwith an actual plastic mat with the pads for connectionspower supply has not been decided yetled'sMax. Forward Voltage: 3.0-3.4VMax. Reverse Voltage: 5VMax. Forward Current: 15-20mAMax. Reverse Current: 15-20mAcan i use a resistor pots like this to adjust the brightness (same for the blink and music)http://www.digikey.com/product-search/en/potentiometers-variable-resistors/thumbwheel-potentiometers/262240tell me if i left anything outtake the led an battiery out of the picture

author: Zero999
author_rank: Super Contributor
timestamp: February 23, 2014, 11:27:33 am
content: That circuit will blow the LED and could damage the 555 because it has no current limiting resistor. The 555's output will drop about 1.4V. Connect a 68R to 120R in series with the LED for a forward current of between 10mA and 20mA.It has no decoupling so could be unstable. Add a 100nF capacitor across the supply rails and 10nF between pin 5 and 0V.

author: ciccio
author_rank: Frequent Contributor
timestamp: February 23, 2014, 11:48:35 am
content: Not all 555 are the same. The internal circuitry may be different, even if the data sheet report the same schematic.I recently got a lot of TI NE555 that did not work reliably in a circuit where ST NE555 worked correctly.I though about fake or defective ICs (but they came form a reliable distributor), but when tested in a different circuit they operated perfectly.I had no time for understanding the problem, so the whole tube with 100 ICs went to the trash bin (the cost allowed this...)Best regards