4.7k resistor - Page 1
Forum section: electronics / beginners

author: Dellyjoe
author_rank: Regular Contributor
timestamp: June 24, 2013, 06:19:23 pm
content: hello everyone i just have a fast questionfor my project i need 3 5k resistors and i got 5k ohm 3w 5% axial which did not fit into my breadboard so i went to radio shack and all i found were 4.7k would this be a big deal for my project.my project has 16 leds and a little microphone which when music is played the the leds will light up when the tone for the light sounds.here is a pic of the schematicThis is from a book, and it is my first project that im learning from. any help.The 5k resistors are R23, R6, R8

author: Christopher
author_rank: Frequent Contributor
timestamp: June 24, 2013, 06:23:05 pm
content: which resistors are you replacing?if its the current limit for the LEDs go ahead, will make the LEDs a bit more bright (not the end of the world) as these are controlled by the tranniesIf its part of the amp stage, don't do itas it may cause a malfunction (unlikey it will be that much)You could always use 2x10k in parallel to get 5k. Why are you using such massive power rating resistors?

author: Dellyjoe
author_rank: Regular Contributor
timestamp: June 24, 2013, 06:33:50 pm
content: Quote from: Christopher on June 24, 2013, 06:23:05 pmhey chris that is what the project called for and The 5k resistors are R23, R6, R8sorry i did not put that in there

author: c4757p
author_rank: Super Contributor
timestamp: June 24, 2013, 06:43:36 pm
content: Those aren't critical. 4.7k or 5.6k should do just fine. (There's also 5.1K in E24, only 2% out, but most kits don't include E24.) Standard quarter-watt resistors, the cheapest you can get, are perfect.Also - 4.7k is only 6% out from 5k, and anything old enough to have been designed with 5k resistors (now a non-standard value, the closest you get in the usual sequences is 4.99k and that's pretty uncommon) is probably old enough to have been designed with 10% resistors or worse, unless it's something precision like a multimeter.Quote from: Bored@Work on June 24, 2013, 06:45:18 pmYou beat me to it.

author: Bored@Work
author_rank: Super Contributor
timestamp: June 24, 2013, 06:45:18 pm
content: Your book is likely rather old.http://en.wikipedia.org/wiki/Preferred_number#E_series

author: Unknown
author_rank: Unknown
timestamp: June 24, 2013, 07:42:17 pm
content: What strikes me about this circuit is that the stages are nearly identical except for R8 and C6. Can someone with more experience than me tell me what difference those components will make to the eventual operation?

author: MasterOfNone
author_rank: Regular Contributor
timestamp: June 24, 2013, 07:56:47 pm
content: My guess is one section is tuned for High Frequency the other for Low Frequencies. (i.e. high and low pass filter arrangements).

author: c4757p
author_rank: Super Contributor
timestamp: June 24, 2013, 07:57:27 pm
content: You beat me to it again! Yes, the top is a high pass filter and the bottom is a low pass filter.

author: MasterOfNone
author_rank: Regular Contributor
timestamp: June 24, 2013, 08:01:30 pm
content: Quote from: c4757p on June 24, 2013, 07:57:27 pmAgain? I don't believe that, you're like lightning.

author: Unknown
author_rank: Unknown
timestamp: June 24, 2013, 08:06:27 pm
content: Oh, I see. I missed C3 and R25 too, that makes a lot more sense.

author: c4757p
author_rank: Super Contributor
timestamp: June 24, 2013, 08:07:27 pm
content: Yes, very, very slow lightning.

author: Dellyjoe
author_rank: Regular Contributor
timestamp: June 24, 2013, 10:00:41 pm
content: Quote from: MasterOfNone on June 24, 2013, 07:56:47 pmyes your right that is what it says in the book. wow your good.

author: Dellyjoe
author_rank: Regular Contributor
timestamp: June 24, 2013, 10:01:22 pm
content: thank you everyone for your help, i will be putting everything together tomorrow to see what happenscant wait.

author: MasterOfNone
author_rank: Regular Contributor
timestamp: June 24, 2013, 10:28:14 pm
content: Quote from: Dellyjoe on June 24, 2013, 10:00:41 pmThanks for the complement, it’s amazing what you can do with a few mirrors and some smoke