Resistor Help

[williams5449]

Hi Everyone,

I'm trying to delve into the electronics world so I just bought an Elec Learning Lab from RS. The very first lesson calls for a 4.7k resistor. Well they didn't give me one. I've got 4.4k and a 5.2k. Can I use one of these instead? It's for a little LED Flasher.

Thanks for any help.

Danny

 

[Ian Rogers]

What's the voltage available in the kit? 4.7k seems a bit high anyway... LED will be a bit dim.

12V - (LEDv) 3V = 7V

7V / 4700Ω = 1.5mA.

I can't see the voltage being higher that 12V..

 

[tronitech]

It may be a timing resistor for the oscillator? Try the 4k4 it won't make much difference.

 

[Ross Craney]

It is odd that they would give you NON standard values but fail to give a 4K7 which is a standard value. You are reading them properly ?

4k4 - yellow yellow red ( just saying it doesn't seem right)
5k2 - green red red ( & that is even worse)

 

[unclejed613]

it seems odd you would have those resistor values. they're not in the E24 series, which begs the question, how did you arrive at these values? if you measured them with a meter, then the "4k4" is probably marked as a 4k7 (or a 4k3), and the "5k2" is probably marked as 5k1. which would be bands of yel/vio/red for the 4k7 (or numeric marking 472) and the 5k1 would be banded grn/brn/red (numeric marking 512 or 5100). if the first resistor is a 4k3, then it would be yel/orn/red (numeric 432 or 4300).

the standard E-series decade values can be found here: https://www.logwell.com/tech/components/resistor_values.html