Ok so the audio path should be as short as possible however resistors lay in the way and well they are long. I get the film non inductive ones per recommendations and at a point to start working on a final layout. I have seen resistors standing tall in things I salvaged for parts however it seems the leads were treated w some paint or epoxy. Is this to compensate for lesser quality resistors where the leads can be inductive or magnetic or should I treat the leads the same way to minimize the audio path and not pick up unwanted sound?
" Is this to compensate for lesser quality resistors "
It's to keep them from shorting out if they fall against another part.
It's to keep them from shorting out if they fall against another part.
Should it? Might be better to say that the audio path should not be excessively long.JaredC79 said:
Most resistors are necessary. Most resistors are small.
No and no.
Before you fix your final layout you may wish to read a good book on audio circuits.
So I can keep them flat against the board on the signal path with no issues? Why do some OEMs stand them on their ends? Once I finish the exact values and protoboard it to a point that is exceptable I will have an engineer look at it and possibly hire another one as well for their input
"Why do some OEMs stand them on their ends?"
To save space.
I once designed an amplifier with these kind of resistors. They changed their mind and wanted surface mount, but the board needed to be bigger to give the pick-and-place arms enough clearance to work.
To save space.
I once designed an amplifier with these kind of resistors. They changed their mind and wanted surface mount, but the board needed to be bigger to give the pick-and-place arms enough clearance to work.
"does a special coating need to be applied to the lead?"
No.
You may want to put a crimp in the lead (like what you see in the factory part) to help keep them upright.
No.
You may want to put a crimp in the lead (like what you see in the factory part) to help keep them upright.
ONE reason resistor leads might be coated is to prevent them from leaning on a neighbor and shorting together.
When you see something you don;t understand in a commercial product, keep in mind that it is VERY important to them how it gets put together. End mounting resistors so three can sit in the space of one flat one makes the boards a lot smaller - and thus cheaper. That has nothing to do with sonic excellence, it has to do with accounting excellence.
When you see something you don;t understand in a commercial product, keep in mind that it is VERY important to them how it gets put together. End mounting resistors so three can sit in the space of one flat one makes the boards a lot smaller - and thus cheaper. That has nothing to do with sonic excellence, it has to do with accounting excellence.
Should I invoice you for the advice I gave in post 3? I didn't realise that this was a commercial question.JaredC79 said:
"ONE reason resistor leads might be coated is to prevent them from leaning on a neighbor and shorting together."
Still worth repeating what I said in post #2, thank you.
Still worth repeating what I said in post #2, thank you.
You can invoice me if you can assist in the completion and optimization of this amp series. Feel free to PM me.
I would learn some basics of EMC, Henry Ott and Ralph Morrison are good starts.... especially if you are going to do a PCB
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