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Heavy gain effects pedals into interface - Dumb it down?

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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby garrettendi » Tue Nov 19, 2019 8:17 pm

Haha! You got me there I guess!

Thanks muchly for the help chaps!
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby Sam Spoons » Wed Nov 20, 2019 12:22 am

:thumbup:
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby ef37a » Wed Nov 20, 2019 10:23 am

Some numbers Mr G?

The Boss clone pedal is powered from 9V and therefore can only put out a bit less than 3Vrms* as an absolute maximum.

The line input on the Berry can handle up to +22dBu according to the specc' which is some 10Vrms, so you see you have a headroom of more than times three or about 10dB.

*I you don't know about 'rms, peak, peak to peak' I suggest you find out. I will bet Hugh has covered it at some point in the magazine?

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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby garrettendi » Wed Nov 20, 2019 10:31 am

ef37a wrote:Some numbers Mr G?

The Boss clone pedal is powered from 9V and therefore can only put out a bit less than 3Vrms* as an absolute maximum.

The line input on the Berry can handle up to +22dBu according to the specc' which is some 10Vrms, so you see you have a headroom of more than times three or about 10dB.

*I you don't know about 'rms, peak, peak to peak' I suggest you find out. I will bet Hugh has covered it at some point in the magazine?

Dave.

Cheers Dave, the clone is powered by a 9V battery so all your figures would be correct. I'd love to learn more about RMS and peaks and whatnot as I find it all confusing. I'd like to be able to calculate all this stuff myself.

During my lunch break today I'll scour the SOS archives for appropriate articles but in the meanwhile if anyone can recommend anything in particular to read I'd love to know. I'll be sure to look myself when I can though!
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby Kwackman » Wed Nov 20, 2019 10:47 am

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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby garrettendi » Wed Nov 20, 2019 11:39 am

I've already read the gain staging one! I'll have a re-read of it.

Thanks Kwackman!
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby ef37a » Wed Nov 20, 2019 12:10 pm

garrettendi wrote:I've already read the gain staging one! I'll have a re-read of it.

Thanks Kwackman!

Have a go at this as well...https://testguy.net/content/270-Peak-vs ... MS-Voltage

Unfortunately (as is so often the case) audio terminology is pretty slack. The absolute maximum level for an audio digital signal of 0dB fs is often called "the peak" but it has nothing to do with the above link!

An interface might have a specified output of say +20dBu or 7.75 volts and be referred to as the "peak" output. It is not! It is still the rms voltage.

Signals do of course have an 'average' level and a peak level but they are not the same as the mathematical relationship between rms and average or peak for a sine wave. Rms is basically the 'normal' way we express voltage. Mains is nominally 230V but has a peak value of 325 V peak and twice that for the peak to peak voltage!

Test meters are usually calibrated to measure the average value of a sine wave. Some more expensive ones claim to measure 'true rms' but almost all only do so for 'power' frequencies, 400Hz tops (if yer lucky!) Do NOT rely on them to accurately measure your audio signals.

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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby Wonks » Wed Nov 20, 2019 1:14 pm

As you can see, Peke to Peke is about 2" in this example.

Image
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby Sam Spoons » Wed Nov 20, 2019 2:35 pm

:clap: :clap: :clap: :bouncy: :bouncy: :bouncy:

I think Wonky's peked
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby Wonks » Wed Nov 20, 2019 2:37 pm

Certainly feeling dog-tired.
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby garrettendi » Wed Nov 20, 2019 2:47 pm

I've now got a number of SOS articles to read about all this stuff! Hopefully if there's anything I don't understand, I can badger you fine people!
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby blinddrew » Wed Nov 20, 2019 4:12 pm

garrettendi wrote: Hopefully if there's anything I don't understand, I can badger you fine people!
Only if you're dogged about it.
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby garrettendi » Wed Nov 20, 2019 5:09 pm

These dog puns are rotten-weiler

EDIT: Please don't ban me, mods...
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Re: Heavy gain effects pedals into interface - Dumb it down?

Postby blinddrew » Wed Nov 20, 2019 6:41 pm

If they start banning people on the basis of bad puns they'd be barking.
There will be no-one left but, well, three men and a dog...
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