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Hoffman Amps Forum image Author Topic: Stacked cap & resistor question  (Read 2868 times)

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Offline CordovaNate

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Stacked cap & resistor question
« on: September 28, 2020, 10:30:44 pm »
Looking at board layouts, I often see a capacitor stacked above a resistor using the same two eyelets/turrets.  My question is...if you had room for three eyelets/turrets, could you place the two componets in series, with the cap and resistor sharing the middle of the three eyelets/turrets?

Offline tubeswell

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Re: Stacked cap & resistor question
« Reply #1 on: September 28, 2020, 11:06:33 pm »
Can you draw us a picture with the components in a circuit?
A bus stops at a bus station. A train stops at a train station. On my desk, I have a work station.

Offline sluckey

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Re: Stacked cap & resistor question
« Reply #2 on: September 29, 2020, 03:09:36 am »
Looking at board layouts, I often see a capacitor stacked above a resistor using the same two eyelets/turrets.  My question is...if you had room for three eyelets/turrets, could you place the two componets in series, with the cap and resistor sharing the middle of the three eyelets/turrets?
I think you're most likely describing cathode resistor/cap. Those two components are connected in parallel and cannot be put in series using three turrets as you suggest.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Latole

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Re: Stacked cap & resistor question
« Reply #3 on: September 29, 2020, 05:08:37 am »
The number of turrets used has no importance as long as the connections (series or parallel) are respected

Offline jjasilli

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Re: Stacked cap & resistor question
« Reply #4 on: September 29, 2020, 07:42:09 am »
Looking at board layouts, I often see a capacitor stacked above a resistor using the same two eyelets/turrets.  My question is...if you had room for three eyelets/turrets, could you place the two componets in series, with the cap and resistor sharing the middle of the three eyelets/turrets?
I think you're most likely describing cathode resistor/cap. Those two components are connected in parallel and cannot be put in series using three turrets as you suggest.


Yes. And the term "stacked" has its own meaning, not applicable here.  In sluckey's example, the resistor is said to be "bypassed" by the cap.  The term "stacked" is inapplicable.


Some people like to stack caps.  That's using 2 different types of caps in parallel to add up to the desired value -- such as an oil cap + a plastic cap.  This is done for tonal purposes.


But 2 resistors in parallel are not said to be stacked.  They're just in parallel.  It's a nomenclature thing.




Offline sluckey

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Re: Stacked cap & resistor question
« Reply #5 on: September 29, 2020, 09:02:16 am »
"I often see a capacitor stacked above a resistor using the same two eyelets/turrets."
I took that statement literally. I call it stacking too. Exactly like the three stacked cathode R/Cs in this pic...

    http://sluckeyamps.com/6v6plexi/P-6V6_05_big.jpg

And sometimes I stack the resistor on top of the cap, like the three stacked cathode R/Cs in this pic...

     http://sluckeyamps.com/VAC15/big_guts.jpg

A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline CordovaNate

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Re: Stacked cap & resistor question
« Reply #6 on: September 29, 2020, 09:24:40 am »
Thank you all for your help.

A cathode capacitor/resistor "bypass", as seen on the far right of slucky's 6v6plexi pic, is exactly what I was trying to describe. 

Offline jjasilli

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Re: Stacked cap & resistor question
« Reply #7 on: September 30, 2020, 01:37:10 pm »
"I often see a capacitor stacked above a resistor using the same two eyelets/turrets."
I took that statement literally. I call it stacking too. Exactly like the three stacked cathode R/Cs in this pic...

    http://sluckeyamps.com/6v6plexi/P-6V6_05_big.jpg

And sometimes I stack the resistor on top of the cap, like the three stacked cathode R/Cs in this pic...

     http://sluckeyamps.com/VAC15/big_guts.jpg
Ok, but on a roomier board you may have placed these same components side-by-side.  Then I guess we could say that they've gotten laid horizontally.  :icon_biggrin:


This brings out the distinction between layout vs. schematic.  It has been declared (somewhere, sometime long ago) that the schematic shall prevail. Per layout, using the term stacked for components placed side-by-side vertically seems appealing.  But the term stacked would be confusing for the same 2 components placed side-by-side. 


A tonestack is called a stack, because of the way it's conventionally drawn on a schematic.  Per layout, those components may be all over the place, but not visually stacked at all. 

Offline sluckey

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Re: Stacked cap & resistor question
« Reply #8 on: September 30, 2020, 01:54:34 pm »
Ok, but on a roomier board you may have placed these same components side-by-side.  Then I guess we could say that they've gotten laid horizontally.  :icon_biggrin:
Of course. I swing that way too!   :icon_biggrin:

     http://sluckeyamps.com/phoenix/p11_big.jpg

Quote
This brings out the distinction between layout vs. schematic.  It has been declared (somewhere, sometime long ago) that the schematic shall prevail. Per layout, using the term stacked for components placed side-by-side vertically seems appealing.  But the term stacked would be confusing for the same 2 components placed side-by-side.
Hmm. Not at all confusing to me.

I'm just a country boy. When you tell me to stack stuff, I'm gonna put one on top of the other. Lot of other country boys know what that means too.   :icon_biggrin:   
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Ed_Chambley

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Re: Stacked cap & resistor question
« Reply #9 on: September 30, 2020, 02:53:55 pm »
Well you can stack it, but if it comes a rain, you best roll your pants up.  Then it becomes a pile.


Roll you britches up country boy, anem gnats are just South Alabama ground pepper.  Go goes good on the Alabama steak.

Offline shooter

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Re: Stacked cap & resistor question
« Reply #10 on: September 30, 2020, 03:10:15 pm »
 :laugh:
I just owned cars big enough to throw it all in, or dump it out if I needed the back seat 
Went Class C for efficiency

Offline jjasilli

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Re: Stacked cap & resistor question
« Reply #11 on: September 30, 2020, 05:02:03 pm »
I miss ritchie200!

Offline Ed_Chambley

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Re: Stacked cap & resistor question
« Reply #12 on: October 01, 2020, 08:44:56 am »
I will get Ritchie200.

Offline Ed_Chambley

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Re: Stacked cap & resistor question
« Reply #13 on: October 01, 2020, 08:51:14 am »
:laugh:
I just owned cars big enough to throw it all in, or dump it out if I needed the back seat
If it is the Horizontal Bop as JJ refers and to be laid, you would have to be horizontal.  Is there a vertical bop and if so, are you getting laid or are you getting stand?


All this tech stuff confuses me!

Offline shooter

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Re: Stacked cap & resistor question
« Reply #14 on: October 01, 2020, 09:56:34 am »
Quote
are you getting laid or are you getting stand?
with 6 foot minimum and masks I gave up, sold the big cars, bought a drone for voyeuristic pleasure  :icon_biggrin:
Went Class C for efficiency

 


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