Popping after AMZ supper buffer

Stompboxes circuits published in magazines, books or on DIY electronics websites.
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sgret612
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Post by sgret612 »

Hello.

I put the pulldown resistor (a 10k resistor) right after output of AMZ Supper buffer.

However, I'm not sure that it is apposite method to prevent the popping?

Thanks.

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sgret612
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Post by sgret612 »

sgret612 wrote: However, I'm not sure that it is apposite method to prevent the popping?
I'm sorry about my stupid English mistake.
A thing what I wanted to say is "I'm not sure that it is apposite method to prevent the popping. Any better ideas?"

So, does anyone have any better idea? Or my method to prevent popping is OK?

Thanks.

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DarkRain
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Post by DarkRain »

Hello,

I'm afraid that i had the same problem with that buffer and i didn't manage to find a cure for the pop...

Best regards,
Gabriel Tudoran
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(former Analog Sound)

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phatt
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Post by phatt »

Try lowering the value of coupling caps, in and out.
i.e If they are 10uF then try ~2uF or even 1uF maybe enough.
Also if caps are faulty you may never be able to get rid of pops even with bleed down resistors.
Phil.

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Post by coldcraft »

Black Dynamite wrote:you need to shut the fuck up when grown folks is talkin.

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sgret612
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Post by sgret612 »

phatt wrote:Try lowering the value of coupling caps, in and out.
i.e If they are 10uF then try ~2uF or even 1uF maybe enough.
Also if caps are faulty you may never be able to get rid of pops even with bleed down resistors.
Phil.
Thanks for replies!!!
>Phatt
Do you mean output cap? I 'm worrying that the low freq sound will be cut off...

>coldcraft
Thanks for a great article!! but... what are resistance values and capacitance values in the end?

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Post by coldcraft »

i use 680R or 1k for the series limiting resistors, and usually a 100k to ground on the output.
Black Dynamite wrote:you need to shut the fuck up when grown folks is talkin.

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Post by phatt »

Thanks for replies!!!
>Phatt
Do you mean output cap? I 'm worrying that the low freq sound will be cut off...

>coldcraft
Thanks for a great article!! but... what are resistance values and capacitance values in the end?[/quote]

Yes output Cap, I very much doubt you will loose bass as most guitar gear is HiZ input anyway.
Often I find the difference between 2uF and 10uF is not even audible.
Yes if you wish to drive long lines into low Z input the whole game changes where mixer circuits may have 100uF.

I'd simply test it to see if you loose bass.

I'd go read the link *coldcraft* found as there is good info on that page. :thumbsup

Also agree that 100 Ohms is a little low some opamps may not like that idea.
Go with coldcraft's rule of thumb 500~1k :thumbsup
Phil.

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Post by sgret612 »

phatt wrote:
phatt wrote:
Thanks for replies!!!
>Phatt
Do you mean output cap? I 'm worrying that the low freq sound will be cut off...

>coldcraft
Thanks for a great article!! but... what are resistance values and capacitance values in the end?
Yes output Cap, I very much doubt you will loose bass as most guitar gear is HiZ input anyway.
Often I find the difference between 2uF and 10uF is not even audible.
Yes if you wish to drive long lines into low Z input the whole game changes where mixer circuits may have 100uF.

I'd simply test it to see if you loose bass.

I'd go read the link *coldcraft* found as there is good info on that page. :thumbsup

Also agree that 100 Ohms is a little low some opamps may not like that idea.
Go with coldcraft's rule of thumb 500~1k :thumbsup
Phil.
coldcraft wrote:i use 680R or 1k for the series limiting resistors, and usually a 100k to ground on the output.
Again, Thanks for a replies!!!!

>Phatt
Ok. I will try with a 2uF cap!!

>coldcraft
Do you mean 680R for input and 1k for output? Right?
How about capacitors? You do not put capacitors?

Thanks.

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Post by phatt »

He means the four outputs where all 4 outs are driving the same load.
Think of joining the speaker outputs of 4 100watt Amp heads into one speaker and the result would be Instant smoke and 4 dead amps. :shock:
well it's still a problem with line levels where you do need some series resistance and depending on the ability of the device used it's better to play safe. So anywhere from 680R up too 1k for those 4 series resistors.
If you have split rail supply you can direct couple the inputs but with single supply (i.e. 9Volt Batt) you have to float the ground reference usually at half working voltage so you then need to decouple the incoming AC signal with a capacitor.

One big advantage of split rails and direct coupled circuits is you don't get so many pops and glitching when switching things.
Phil.

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Post by coldcraft »

i meant 680R to 1k for the input and output limiting resistors I linked to. those are just common values that I have.
Black Dynamite wrote:you need to shut the fuck up when grown folks is talkin.

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Post by phatt »

coldcraft wrote:i meant 680R to 1k for the input and output limiting resistors I linked to. those are just common values that I have.
Opps! ta mate, I should have looked at the schemo before I made comment. :oops: Thanks for the clarification. :thumbsup
Phil.

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Post by sgret612 »

coldcraft wrote:i meant 680R to 1k for the input and output limiting resistors I linked to. those are just common values that I have.
Hello.

I'm sorry that I 'm late to reply.

I tried this 2 days ago.
"Putting 1k resistors for input and output current limit and 100k resistor for pulldown."

Then, I got it!! it does not pop anymore!!!!

Thanks a lot!!!!!

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