I’m building a Sabbath distortion

[skymaster747]

In the reference page on R5 it show under resistor “47” now on the PCB board say in
R5 47p. Is that a regular 47K resistor? Thanks

 

[giovanni]

It says 47R which means 47 ohms (it’s weird I know, but I guess it’s because the symbol for ohm is omega which doesn’t appear on a regular keyboard), same as the build doc says.

 

[skymaster747]

Ah ok so is 47ohms not 47K ? Right ?

 

[Big Monk]

Ah ok so is 47ohms not 47K ? Right ?

47 ohms is 47 ohms.

47k ohms or 47 kilo-ohms is 47,000 ohms.

 

[Robert]

Ah ok so is 47ohms not 47K ? Right ?

Correct, 47R is 47 ohm.

(it’s weird I know, but I guess it’s because the symbol for ohm is omega which doesn’t appear on a regular keyboard)

That's standard RKM notation. The letter indicates the unit and takes the position of the decimal point.
(4R7 = 4.7Ω, 47R = 47Ω, 4K7 = 4.7KΩ, 4M7 = 4.7MΩ, etc)

Capacitors follow the same system. (2n2 = 2.2nF, 2u2 = 2.2uF, etc)

RKM code - Wikipedia

en.wikipedia.org

I avoid the omega symbol for the same reason there are no decimal points in the values printed on the PCB... the silkscreen printer isn't extremely high resolution and it could be mistaken as a 0 if the printing is slightly distorted.


You can type an omega symbol by holding down Alt and entering 234 on the numeric keypad.

 

[skymaster747]

Ah ok so is 47ohms not 47K ? Right ?

Yeah what confuse Me, was it say 47P .

 

[Robert]

47p is a 47pF capacitor.

There shouldn't be any resistors marked 47p, where are you seeing this?

 

[giovanni]

47p is a capacitor not a resistor. That stands for 47pF.

 

[giovanni]

@PedalPCB beat me to it!

 

[giovanni]

Also thanks for the RKM link @PedalPCB, I had no idea!

 

[skymaster747]

47p is a 47pF capacitor.

There shouldn't be any resistors marked 47p, where are you seeing this?

 

[skymaster747]

2 spots to the left on the PCB totally my mistake. It throw me off a bit . I’m still new and learning about this stuff . Thx for all your guidance

 

[BuddytheReow]

Where did you get you bc184? If you got it from tayda then it has a different pinout compared to the board. I learned this the hard way