Pimeta...R1G...huh?

[bhjazz]

I've been getting the resistors into my Pimeta today, and am scartching my head over R1G. There is little mention of it on Tangent's Parts Selection Guide, yet I do see it installed in the photos of his assembly guide. I know it has been mentioned in various threads as needing to be the same as R4G, and therefore the same as R1.

So...is it necessary or ???

Thanks.

 

[MisterX]

You thinking about R3G?

You don't need it with a Jfet op-amp.

Actually you don't need it with with a bipolar op-amp either so....

Edit: the first sentence in Tangents R1 explanation is valid for all of the R1's.

Quote:

The main purpose of R1 is to help balance the op-amp's input impedances.

The second sentence explains the rest:

Quote:

Use the value on the schematic unless you have a good reason not to. If you do change it, it needs to be the same in all three channels.

 

[bhjazz]

No, sir. I cannot say that I am. R1G is to the left of R3G in this photo (linked to Tangent...).

See that little bugger? (well, okay, it's been populated...)...but that's R1G.

Wait: I just re-read through the schematic and found it...Okay: I need to lay off of the Merlot when building stuff on Saturday night.

4.32 it is.

Thanks, as always, for setting me straight, MisterX! Much appreciated!

 

[MisterX]

Quote:

Wait: I just re-read through the schematic and found it...Okay: I need to lay off of the Merlot when building stuff on Saturday night. 4.32 it is.

Same for me except you can replace Merlot with Stoli.

I dunno why I was thinking R3G though.

 

[bhjazz]

HAha...Well, hey: you got me on the right path, so that's perfect.

Cheers, buddy!