resistor notation

[Ronak Shah]

what does it mean when they have something like thi sin a schematic:
"4k7"
This is supposed to a resistor... but what kinde or value?
any ideas?
kinda new to this.......

 

[Tim Wescott]

what does it mean when they have something like thi sin a schematic:
"4k7"
This is supposed to a resistor... but what kinde or value?
any ideas?
kinda new to this.......

4.7 kilo ohm, to go between 470r or 470 and 47k.

1r0 = 1 ohm.
10r = 10 ohm
10 = 10 ohm
100 = 100 ohm
1k0 = 1 kilo ohm
10k = 10 kilo ohm
1M0 = 1 mega ohm (but megohm resistors are rare these days).

etc.

 

[Peter A Forbes]

1M0 = 1 mega ohm (but megohm resistors are rare these days).

etc.

Why do you say that, Tim? I appreciate that they are probably not used as much
these days, but they haven't joined the extinct yet have they? )

Peter

 

[Joe McElvenney]

Hi,

what does it mean when they have something like thi sin a schematic:
"4k7"
This is supposed to a resistor... but what kinde or value?

4700 ohms - the 'K' is both the decimal point and the multiplier.

4K7, 4.7K, 4700, which of these equivalents is the shortest and the
most likely to survive poor printing?

The same goes for 4R7 and 4M7.


Cheers - Joe

 

[Joe McElvenney]

Hi,

I Why do you say that, Tim? I appreciate that they are probably not used as much

these days, but they haven't joined the extinct yet have they? )

And 10M0 are great as stand-off insulators during
prototyping over un-etched PCB.


Cheers - Joe

 

[Tim Wescott]

Why do you say that, Tim? I appreciate that they are probably not used as much
these days, but they haven't joined the extinct yet have they? )

Peter

Just that they aren't used much -- they certainly aren't extinct, but
compared to my antique radios they aren't used much at all.

 

[Peter A Forbes]

Just that they aren't used much -- they certainly aren't extinct, but
compared to my antique radios they aren't used much at all.

My late stepfather had a collection of Tobacco tins with his collected
resistors, quite a few as he worked for Mullard during the war and up to 1980,
and when I was at school (1950'd - 1960's) I can remember the hexagonal bodied
resistors with their colour code dots of paint that he had in them. They were
solid carbon then, we used to file nicks in them to change the value...

I megohms was a huge value, used for grid leak resistors IIRC, and he had a few
in there! 470K was the regular high value resistor that everyone had, but the
megohm values were indeed rare.

Peter