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General => Open Discussion => Topic started by: morelius21 on May 10, 2011, 05:30:14 PM

Title: Yellow humper
Post by: morelius21 on May 10, 2011, 05:30:14 PM
someone has yellow Humper? schematics  I would love to do!   ;D ;D ;D

Thanks

Title: Re: Yellow humper
Post by: jkokura on May 11, 2011, 01:45:58 AM
Did a quick google search and didn't find a schem. If you have a schematic I can work from I can get a layout going for you.

Jacob
Title: Re: Yellow humper
Post by: morelius21 on May 11, 2011, 08:35:28 AM
Hi,

thanks jacob.
Title: Re: Yellow humper
Post by: bigmufffuzzwizz on May 11, 2011, 04:45:49 PM
Great idea. It would be cool to do the whole series of original mini mu-tron pedals. I've seen the red ranger and of course orange squeezer around.
Title: Re: Yellow humper
Post by: morelius21 on May 12, 2011, 07:58:06 PM
Sorry my english. ;D ;D ;D ;D

I don't find the schema of this pedal in internet and I want to ask if someone can give me the schema. I can make the layout in the future.  However thanks jacob for your assistence.

Morelius
Title: Re: Yellow humper
Post by: bigmufffuzzwizz on May 12, 2011, 11:40:09 PM
It appears like the schematic is not posted anywhere right now. I asked modman to repost them on an old FSB thread I found. I did find some other info for you though. The purple peaker and yellow humper were very similiar except YH was used for bass guitar.
Here's a PP schem:  http://home-wrecker.com/peaker.html

This is the suggestion from the ROG guy
http://www.diystompboxes.com/smfforum/index.php?topic=30085.0

"The Yellow Humper was a simple EQ circuit, like the Purple Peaker, but tuned for a bass guitar.

The very first step is to increase the input cap.  Then, we can probably lose the parallel cap/resistor high-pass filter.  The twin-t filters are quite easily tuned to different frequencies.  The only obstacle is being restricted to standard cap and resistor values.

For example, I tuned the Purple Peaker's LO filter to 159Hz, which is close to the 12th fret of the low E string.  For a bass, we could drop it down an octave.

To do this, the 100k resistors are changed to 82k and the 51k resistors with 39k.  The .022uF cap is changed to .047uF and the two .01uF caps are each replaced with .022uF caps.

We use the standard formula f=1/(2πRC) with R=82k and C=.022uF
That gives us a notch frequency of 87hz, which is right around the 13th fret of the E string of the bass.

For the HI filter, we could shoot for a filter frequency that is half of the PP version.

We'll still use 82k and 39k resistors in place of the 100k and 51k, respectively.  Next we substitute .0015uF and .0033uF for the 500pF and .001uF caps, respectively.

So with R=82k and C=.0015uF, the filter is tuned to 1.29kHz.  Not exactly half, but decent enough."

Hope that helps until we can get you something better!
Title: Re: Yellow humper
Post by: morelius21 on May 13, 2011, 03:57:57 PM
Hi,

Super information!!!!!!!! Thanks

M

Title: Re: Yellow humper
Post by: bigmufffuzzwizz on May 13, 2011, 06:08:50 PM
Here's a translated version of a site where some guy did lots of comparisons. I forgot to add this in yesterday. Towards the bottom he shows the acutual similarites on a graph between PP and YH. Pretty cool and informative. There's some other common boost there too.

http://66.196.80.202/babelfish/translate_url_content?lp=ja_en&url=http%3A%2F%2Fhomepage3.nifty.com%2Fichian%2Fanalog%2Fspectrum%2Fboost_freq3.htm&.intl=us
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