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zepps_apprentice

Acoustic 360 Pedal

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The Fuzz BLEND control is new and original in design, allowing fully independent mixing of fuzz and straight signals, the FUZZ bypass switching is also re-designed to minimize switch pop/noises. The fuzz circuit uses selected 2n1306 Germanium devices providing a fairly faithful reproduction of the 360 distortion qualities - and with the BLEND control any amount (up to x3 over-unity) of clean signal can be mixed in for a heavier and fuller sound.

2N1306CROP.jpg

On the inside there are two user adjustable trim-pots. The one near the center of the board sets the gain of the output amplifier. This needs to be set carefully since the output amplifier circuit can put out around 22volts (pk-pk) signal. The 360+ comes with an instruction sheet that describes how to best adjust this trimmer.

360+ronDrive.jpg

The pop-less MUTE function is achieved through an original constant-current optical switching design. Since class-A circuits are sensitive to sudden variations in rail current and typically passes on the variation as a click noise to the output it was necessary to devise a switching circuit that leaves the rail currents constant. The MUTE circuit has no effect on sound quality when disengaged.

360+ronSide.jpg

The power supply circuit features an over-kill design that rivals battery operation in terms of noise/ripple output. The new PSU circuit combines passive and active filtering where the 60Hz and 120Hz components find themselves lying below the -96dbV threshold of my 24-bit soundcard (with gain full up); and that's when using an ordinary unregulated AC adapter.

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