aion TITAN Podręcznik - Strona 6

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BUILD NOTES (CONT.)

Clipping switch

The SPDT clipping switch allows for two positions: stock (2N7000, with optional germanium diodes) or

LED clipping. The original OCD never used LED clipping in any version, but it's a very common DIY mod

and it sounds fantastic in this circuit.

Looking at the schematic, you may notice that the LEDs are always connected. The stock clipping mode

has a lower clipping threshold than the LED pair, so when stock mode is engaged, the LEDs have no

signal left to clip and are out of the circuit. They only clip the signal when the stock mode is disabled.

Make sure to use a SPDT on-on switch, not the on-off-on type that is more often used for clipping diodes.

It will still work, but the middle position will be the same as LED clipping.

Germanium diodes

The Titan uses two germanium diodes as part of the optional clipping combinations. These days, the

Russian D9 series are probably the most readily-available NOS germaniums, and will sound great in this

circuit. But be aware that these Russian diodes have the stripe on the anode rather than the cathode,

meaning they should be inserted backwards according to the PCB silkscreen.

This isn't an issue for circuits like the

Klon

Distortion+

that just use two germanium diodes, since

it's electronically identical whether they're both the right way or both backwards. However, since this

circuit puts them in series with the MOSFETs, then if the germaniums are reversed in relation to the

MOSFET polarity, the path to ground will be blocked and only half the waveform will be clipped.

If you're not sure what type of diode you have, it's always best to check the polarity using a multimeter

to avoid a time-consuming mistake.

TITAN DYNAMIC DRIVE