Think I might have missed on the ecap filtering point for the pi.

[Mike_J]

The attached picture shows where I planned to put the filter for the pi. Right between the 100K and 82K resistors. If DC goes in one direction would the first resistor get filtered. Logic says no but I may be missing something. Would appreciate some advice regarding the placement of the filter cap while it is still an easy fix.


Think the easiest fix would be to switch the red wire coming from the 4.7K dropping resistor from the first resistor to the ecap. Leave the wire from the ecap to the resistor on the left and send a jumper from the first resistor to the second resistor. It gets pretty tight, maybe impossibly, if I try to move the ecap to the left.


Thanks
Mike

[pdf64]

It probably seems obvious to you but I’m confused, not clear ehat the issue is, could you rephrase the query?

[Mike_J]

It probably seems obvious to you but I’m confused, not clear ehat the issue is, could you rephrase the query?

Better yet I will send you a picture. In the first picture in reply 1 you will see the ecap turrets. I am still waiting on the actual ecaps to arrive. The turrets are right between the 100K and 82K resistors feeding the PI. Looked at it and said bet that won't work. Reason I reasoned was that I am pretty sure DC goes in one direction. That being the case the cap on the left would miss out on some filtering.


Solution was to run the power from the 4.7K dropping resistor directly to the turrets the ecap will occupy. Then run a wire to the resistor I think would have been missed and run a jumper to the other resistor. Now both resistors are getting filtered by the 22uF @ 500VDC ecap.

[acheld]

It's really difficult to understand the circuit from your photos.   

I think you're better off attaching a schematic and drawing in your proposed change.   

Schematics and photos go together like butter and toast.   Both are good, but together they are . . . great!

[pdf64]

Or a layout sketch.
From what I can make out, you may be getting into a dreadful muddle.

[Mike_J]

It's really difficult to understand the circuit from your photos.   

I think you're better off attaching a schematic and drawing in your proposed change.   

Schematics and photos go together like butter and toast.   Both are good, but together they are . . . great!

Am pretty sure now it doesn't matter which way I wired those resistors. Either one would work. There are elements of each of them on the Fender 5f6a schematic as highlighted on the attached picture. In reply one I split the 82K and 100K resistors as per the schematic. However I sent the power from the dropping resistor to the 100K resistor whereas the schematic has it attached to the positive end of the ecap and the junction of the 100K and 82K caps.


So the best thing to do if I want this to be identical to the Fender schematic is to reconnect both of the ends of the 100K and 82K resistors to the ecap which is right in the middle and leave the 4.7K dropping resistor also attached there and I will be consistent with the schematic. The Hoffman layout had the ecap tied directly to the 100K resistor and then running to the 82K resistor. The schematic showed the ecap running directly to the 82K resistor and then over to the 100K resistor. In the end it doesn't matter which of these ways it is done.


However, I am going to send the power from the 4.7K dropping resistor to the ecap like I have it now and will go back to going in both directions to the 100K and 82K resistors because I like the symmetry of it that way and I am supported by the original Fender schematic for what that is worth.

[2deaf]

The attached picture shows where I planned to put the filter for the pi. Right between the 100K and 82K resistors. If DC goes in one direction would the first resistor get filtered. Logic says no but I may be missing something. Would appreciate some advice regarding the placement of the filter cap while it is still an easy fix.


Think the easiest fix would be to switch the red wire coming from the 4.7K dropping resistor from the first resistor to the ecap. Leave the wire from the ecap to the resistor on the left and send a jumper from the first resistor to the second resistor. It gets pretty tight, maybe impossibly, if I try to move the ecap to the left.


Thanks
Mike

As long as the two resistors are connected, they are both getting filtered.  It doesn't matter what order they are connected in.

[pdf64]

A circuit node by definition is uni potential, you really don’t need to worry about how the current will be flowing. Like water, it will manage that itself.
Sometimes details matter, sometimes, like here, they don’t 

[Mike_J]

Or a layout sketch.
From what I can make out, you may be getting into a dreadful muddle.

I live in a constant state of dreadful muddle. Where you might be having a hard time following me is I will be using radial capacitors on the board. The position I am using has two benefits. One is it fit well in the area which can be pretty congested when all of the components in the PI are considered. Second the power wire will be short. In fact from a power point of view there would be no way of making it any shorter. Thanks for the dreadful muddle. Will try to remember that one. I am not the only one I know that is in a constant state of dreadful muddle.

[Mike_J]

The attached picture shows where I planned to put the filter for the pi. Right between the 100K and 82K resistors. If DC goes in one direction would the first resistor get filtered. Logic says no but I may be missing something. Would appreciate some advice regarding the placement of the filter cap while it is still an easy fix.


Think the easiest fix would be to switch the red wire coming from the 4.7K dropping resistor from the first resistor to the ecap. Leave the wire from the ecap to the resistor on the left and send a jumper from the first resistor to the second resistor. It gets pretty tight, maybe impossibly, if I try to move the ecap to the left.


Thanks
Mike

As long as the two resistors are connected, they are both getting filtered.  It doesn't matter what order they are connected in.

Thank you for the reply. It took me a little while to get to the party but I finally got there.