Saturday, November 1, 2008

Thursday, October 30, 2008

http://www.legendarytones.com/hrc1.html

Close Microphone EQ Ranges

The frequency ranges of EQ for guitar are consistent no matter if you desire a distorted sound or a clean sound. You will find the bottom end, or ‘growl,’ of the guitar in the space around 100Hz. This frequency when boosted conservatively (2 – 3 decibels (dB)), will give the guitar the warmth, however, it is VERY important to be careful when tinkering around this frequency because at 200Hz you will find a frequency that in too large of an amount will destroy all clarity in a recording and ‘muddy’ it up. The ‘body’ frequencies can be found between 500 and 600Hz, and can be boosted slightly. By slightly, I mean 2 to 5 dB. The frequencies that bring out the psycho acoustics and give the guitar sound its ‘edge’ lie between 3 and 4KHz. Boosted slightly, they can provide a solid, cutting sound, however, used too heavily, they can be piercing and cause headaches. The 5 – 8KHz frequencies bring out the sibilants. A small boost (1-2dB) in this range will give the sound a little bit of ‘sparkle,’ and will bring out the sound of the pick on the strings. Finally, to give the sound some high-frequency clarity, you can boost the 10KHz range (Try 5 - 7dB). This will set the guitar apart from other instruments that may be playing in its register, such as piano.

Broken Down:

100Hz Slight boost (2 –3 dB)

200Hz Slight cut (1dB)

5 – 600Hz Slight boost (2 – 5dB)

3 – 4KHz Slight boost (1 – 3dB)

5 – 8KHz Small Boost (1 – 2dB)

10KHz Boost (5 – 7dB)

Saturday, August 9, 2008

Notes on Fuzz

Biasing: http://www.physics.mcgill.ca/~grant/Stuff/fuzzface.txt

http://www.theohartman.com/fuzz_faq.htm#Q:%20What%20is%20Bias%20and%20why%20isn't%20Bias%20Control%20a%20standard%20feature?:

the bias of the transistors of the fuzz circuit establish headroom (and thus its complement, breakup) in much the same way bias does on a tube amplifier. In both cases, the bias, or operating point, can be set permanently with a resistor soldered into the circuit board, or adjustably, with a trim-pot or knob. The original Fuzz Face established bias with the permanent/resistor method. It is worth noting that since every resistor has a tolerance (we use the same 5% carbon-composition resistors used in the original circuit), and no two Germanium transistors are alike, that you cannot mass produce Fuzz Faces with this bias method because each unit must have its transistors selected to bias correctly with the components on-board. HARTMAN Vintage Germanium Fuzz are built by fixing resistor values and selecting the transistor values. Again, not the only way it can be done, just the way we happen to do it.

If the Ge transistors selected are stable, in range, and pedal gets used in "normal" conditions, bias only decreases the amount of fuzz available. It does not significantly alter the character of the fuzz in quite the same way it does on the BC108 Silicon models (which is why it IS a standard feature on those). It's a "less-is-more" thing: one less component to fail, one less knob whose setting you have to worry about, one less gimmick.

Monday, August 4, 2008

Amp sound vs. mic recorded sound

I found this today:

"Trouble is, most players want the PODxt to sound like what they hear from a guitar amp, and not the sound the mike "hears". This is generally much thinner and fizzier. As a simple experiment, compare the typical 45 degree off-axis sound most players listen to about 6 feet away, to the sound 3 inches away in front of the speaker."

This is the exact problem I was concluding the other day that I have. I know what a guitar amp should sound like but I try to achieve this as well when I record which of course is completely unrealistic.

Tuesday, July 29, 2008

http://en.wikipedia.org/wiki/Overdrive_%28music%29

"A guitar amplifier's tone controls shape a different power-tube distortion voicing if the tone controls are set to emphasize the bass or treble. Extreme settings are most popular in heavy metal. Increasing the bass and treble while reducing or eliminating the centre midrange (750Hz) results in what is popularly known as a "scooped" sound (since the midrange frequencies "scooped" out). James Hetfield of Metallica used this tone on many songs on Metallica's first four studio albums. Conversely, decreasing the bass while increasing the midrange and treble creates a harsher sound. Kerry King and Jeff Hanneman of Slayer have both used midrange-heavy tones since the mid-1980s."

Monday, July 28, 2008

Eagle notes

So far, I've been using the Gaussmarkov (http://gaussmarkov.net/) libraries (http://gaussmarkov.net/eagle/lbr/gm-lbr.zip) mostly. I increase the pad size with the DRC to 20 mil (http://gaussmarkov.net/wordpress/tools/software/eagle/setting-all-pad-sizes/) and draw the signal traces with a thickness of 0.024.

After exporting the PCB image (900 dpi), I import it into Photoshop, invert the image and reduce the size to 40% of the original. I check scale of the printed image by seeing if the length from resistor hole to hole is between 0.6 and 0.7 minimeter.

MXR Distortion+ (Tonepad PCB)

Unfinished: as can be seen, I still need to do the deco...














Sunday, July 27, 2008

Tonepad - Sinamp (Sans Amp GT-2)

From the Tonepad website (http://tonepad.com/project.asp?id=22). This was the last project where I bought the PCB.












































Once finished, in the California setting with TL072IP (low noise) ICs I ended up with a whistle sound after stopping a note round the 7th/9th fret of the G string. Replacing the TL's for NE5532P's fixed the problem.

Run off groove - Supreaux (Supro 16T preamp)

From the ROG website (http://runoffgroove.com/supreaux.html).





























Blog manifesto (Statement of Purpose)

Post some stuff on DIY guitar pedals that I've been working on in the last 3 months to create somewhat of a record for future reference...