Aion Electronics CERULEAN Gebruiksaanwijzing - Pagina 5

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BUILD NOTES

Clipping switch
The clipping switch allows you to select between soft clipping (stock Bluesbreaker), hard clipping (King
of Tone) and no clipping (boost mode).
You can change the function of this control by using a different type of switch.
• Use a DPDT on-on-on if you want the middle setting to be "both" instead of "neither". However, be
aware that the hard-clipping mode has a lower threshold than soft-clipping mode, so soft + hard
mode will not sound much different than hard mode by itself.
• Use a DPDT on-on if you only want to have hard and soft clipping modes available.
Mode switch
The Mode switch selects between V1 (pre-95) and V2 (post-95) versions of the circuit. The only
differences are the values of two resistors, R4 and R6, coming off the first op-amp stage feedback loop.
In the first version, these resistors were 27k and 33k respectively. In the second version, these were
dropped to 4.7k and 3.3k, which raises the gain and reduces the bass somewhat.
The Mode switch changes these two resistors from V1 to V2 values. Rather than switching between two
different resistors, it adds resistors in parallel with the existing ones for the same effective value (or at
least within 2%, which is well inside of the 5% tolerance of the carbon film resistors used in the original).
By doing it this way, we can avoid momentarily disconnecting the feedback loop's path to ground, which
could cause an audible pop when the switch is used.
Gain range switch
The DIP switch sets the gain range of the Drive control. In normal mode, it's equivalent to the stock
Bluesbreaker circuit. Medium- and high-gain modes shift the range higher, allowing for an extended
range of tones not found in the original pedal.
The DIP switch settings are as follows:
Note: Position 1 overrides position 2, so if both switches are in the up position, it will be in normal mode.
CERULEAN AMP OVERDRIVE
Normal
ON
1 2
Medium
ON
1 2
High
ON
1 2
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